WO2006100241A2 - Verfahren zur herstellung von mehrfach ungesättigten c20- und c22-fettsäuren mit mindestens vier doppelbindungen in transgenen pflanzen - Google Patents
Verfahren zur herstellung von mehrfach ungesättigten c20- und c22-fettsäuren mit mindestens vier doppelbindungen in transgenen pflanzen Download PDFInfo
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- WO2006100241A2 WO2006100241A2 PCT/EP2006/060913 EP2006060913W WO2006100241A2 WO 2006100241 A2 WO2006100241 A2 WO 2006100241A2 EP 2006060913 W EP2006060913 W EP 2006060913W WO 2006100241 A2 WO2006100241 A2 WO 2006100241A2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6436—Fatty acid esters
- C12P7/6445—Glycerides
- C12P7/6472—Glycerides containing polyunsaturated fatty acid [PUFA] residues, i.e. having two or more double bonds in their backbone
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8242—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits
- C12N15/8243—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits involving biosynthetic or metabolic pathways, i.e. metabolic engineering, e.g. nicotine, caffeine
- C12N15/8247—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits involving biosynthetic or metabolic pathways, i.e. metabolic engineering, e.g. nicotine, caffeine involving modified lipid metabolism, e.g. seed oil composition
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0071—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14)
- C12N9/0083—Miscellaneous (1.14.99)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1025—Acyltransferases (2.3)
- C12N9/1029—Acyltransferases (2.3) transferring groups other than amino-acyl groups (2.3.1)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
- C12P7/6427—Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
- C12P7/6427—Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
- C12P7/6432—Eicosapentaenoic acids [EPA]
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
- C12P7/6427—Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
- C12P7/6434—Docosahexenoic acids [DHA]
Definitions
- the present invention relates to a process for the production of polyunsaturated fatty acids in transgenic plants, in which nucleic acids are introduced into the plant, which for polypeptides having ⁇ 6-desaturase, ⁇ 6-elongase, a ⁇ 5-desaturase - encode ⁇ -5-elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase activity.
- These desaturases and elongases are advantageously derived from Phytophtora sojae.
- the invention further relates to the nucleic acid sequences, nucleic acid constructs, vectors and organisms containing the nucleic acid sequences according to the invention, vectors containing the nucleic acid sequences and / or the nucleic acid constructs and transgenic plants contain the aforementioned nucleic acid sequences, nucleic acid constructs and / or vectors.
- Another part of the invention relates to fatty acid compositions prepared by the process according to the invention and their use.
- Fatty acids and triacylglycerides have a variety of uses in the food, animal nutrition, cosmetics and pharmaceutical industries. Depending on whether they are free saturated and unsaturated fatty acids or triacylglycerides with an increased content of saturated or unsaturated fatty acids, they are suitable for a wide variety of applications.
- Polyunsaturated fatty acids such as linoleic and linolenic acids are essential for mammals because they can not be produced by them. Therefore, polyunsaturated ⁇ -3 fatty acids and ⁇ -6 fatty acids are an important component of animal and human food.
- polyunsaturated long-chain fatty acids Due to the customary composition of human food today, addition of polyunsaturated ⁇ -3 fatty acids, which are preferred in fish oils, is particularly important for food.
- the unsaturated fatty acid DHA is thereby attributed a positive effect on the development and maintenance of brain functions.
- polyunsaturated fatty acids are referred to as PUFA, PUFAs, LCPUFA or LCPUFAs (poly unsaturated fatty acids, PUFA, polyunsaturated fatty acids, long chain polyunsaturated fatty acids, LCPUFA).
- the free fatty acids are advantageously prepared by saponification.
- Common natural sources of these fatty acids are fish such as herring, salmon, sardine, perch, eel, carp, trout, halibut, mackerel, zander or tuna or algae.
- oils with saturated or unsaturated fatty acids are preferred.
- lipids with unsaturated fatty acids especially polyunsaturated fatty acids
- the polyunsaturated ⁇ -3 fatty acids thereby a positive effect on the cholesterol level in the blood and thus the possibility of preventing heart disease is attributed.
- ⁇ -3 fatty acids By adding these ⁇ -3 fatty acids to the diet, the risk of heart disease, stroke or hypertension can be significantly reduced.
- inflammatory especially chronic inflammatory processes in the context of immunological diseases such as rheumatoid arthritis can be positively influenced by ⁇ -3 fatty acids. They are therefore added to foods especially dietary foods or found in medicines application.
- ⁇ -6 fatty acids such as arachidonic acid tend to have a negative effect on these diseases in these rheumatic diseases due to our usual food composition.
- ⁇ -3- and ⁇ -6 fatty acids are precursors of tissue hormones, the so-called eicosanoids such as the prostaglandins derived from dihomo- ⁇ -linolenic acid, arachidonic acid and eicosapentaenoic acid, the thromoxanes and leukotrienes derived from arachidonic acid and Derive the eicosapentaenoic acid.
- Eicosanoids which are formed from ⁇ -6 fatty acids usually promote inflammatory reactions
- eicosanoids (so-called PG 3 series) of ⁇ -3 fatty acids have little or no pro-inflammatory effect. Due to their positive properties, there has been no lack of approaches in the past, genes involved in the synthesis of fatty acids or triglycerides, for to make available the production of oils in various organisms with modified unsaturated fatty acid content. Thus, WO 91/13972 and its US equivalent describe a ⁇ -9-desaturase. In WO 93/11245 a ⁇ -15-desaturase is claimed in WO 94/11516 a ⁇ -12-desaturase.
- microorganisms for the production of PUFAs are microorganisms such as microalgae such as Phaeodactylum tricornutum, Porphiridium species, Thraustochytrien species, Schizochytria species or Crypthecodinium species, ciliates such as Stylonychia or Colpidium, fungi such as Mortierella, Entomophthora or Mucor and / or mosses such as Physcomitrella, Ceratodon and Marchantia (R.
- microalgae such as Phaeodactylum tricornutum, Porphiridium species, Thraustochytrien species, Schizochytria species or Crypthecodinium species
- ciliates such as Stylonychia or Colpidium
- fungi such as Mortierella, Entomophthora or Mucor and / or mosses
- Physcomitrella, Ceratodon and Marchantia R.
- Chain length - instead of the ⁇ 4-desaturation, a further elongation step at 24 C, a further ⁇ 6-desaturation and finally beta-oxidation to the C 22 is carried out here.
- the so-called spokesman synthesis path (see FIG. 1) is not suitable since the regulatory mechanisms are not known.
- the unsaturated fatty acids having double bonds for example in delta-9 , delta-6 or delta-5-position by at least two carbon atoms extend.
- Their function according to two different Elongasetypen be distinguished.
- the type I elongases which are widespread in the animal kingdom, have only a low substrate specificity, that is, they prolong a number of different unsaturated fatty acids.
- Type I I elongases are characterized by a much higher substrate specificity. They convert only a few fatty acids into double bonds in specific positions.
- WO 2005/012316 describes some of the abovementioned desaturases and elongases. Specifically WO 2005/012316 discloses first type II elongases which specifically elongate fatty acids having a double bond in the delta-5 position.
- the polyunsaturated fatty acids can be classified according to their desaturation pattern into two large classes, ⁇ -6 or ⁇ -3 fatty acids, which have metabolically and functionally different activities (Figure 1).
- the starting material for the ⁇ -6 pathway is the fatty acid linoleic acid (18: 2 ⁇ 912 ), while the ⁇ -3 pathway is via linolenic acid (18: 3 ⁇ 9 12 '15 ).
- Linolenic acid is formed by the activity of an ⁇ -3-desaturase (Tocher et al., 1998, Prague Lipid Res., 37, 73-117, Domergue et al., 2002, Eur. J. Biochem., 269, 4105-4113).
- ⁇ -3 fatty acids shows the therapeutic effect as described above in the treatment of cardiovascular diseases (Shimikawa 2001, World Rev. Nutr., Diet, 88, 100-108), inflammations (Calder 2002, Proc. Soc., 61, 345-358) and Arthridis (Cleland and James 2000, J. Rheumatoi 27, 2305-2307).
- Higher plants contain polyunsaturated fatty acids such as linoleic acid (C18: 2) and linolenic acid (C18: 3).
- ARA, EPA and DHA are absent or only found in the seed oil of higher plants (E. Ucciani: Wunsch Dictionnaire des Huiles Vegeches, Technique & Documentation - Lavoisier, 1995. ISBN: 2-7430-0009-0).
- LCPUFAs in higher plants, preferably in oilseeds such as oilseed rape, linseed, sunflower and soybeans, as this will enable large quantities of high quality LCPUFAs to be obtained inexpensively for the food, animal and pharmaceutical industries.
- WO 2005/012316 discloses such an approach.
- a disadvantage of the method described in WO 2005/012316 is that the yield of the desired fatty acids is still too low for industrial use.
- desired fatty acids such as ARA, EPA or DHA
- undesired side reactions also produce fatty acids which further reduce the yield and contaminate the resulting product.
- the inventive method for the preparation of polyunsaturated C 2 o- or C 22 -fatty acids having at least four double bonds in transgenic plants with a content of at least 15 wt .-% based on the total triglyceride content of the transgenic plant characterized in that it comprises the following method steps: a) introduction of a nucleic acid construct into the transgenic plant which contains nucleic acid sequences coding for a ⁇ 6-desaturase, a ⁇ 6-elongase and a ⁇ 5-desaturase, or b) Introducing a nucleic acid construct into the transgenic plant containing nucleic acid sequences encoding a ⁇ 6-desaturase, a ⁇ 6-elongase, a ⁇ 5-desaturase, a ⁇ 12-desaturase and ⁇ 3-desaturase
- nucleic acid construct containing nucleic acid sequences encoding a ⁇ 6-desaturase, a ⁇ 6- ⁇ 5-desaturase, a ⁇ 5-elongase and ⁇ 4-desaturase; -Longase, a ⁇ -5-desaturase, a ⁇ -5 elongase, ⁇ -4-desaturase, a ⁇ -12-desaturase and ⁇ -3-desaturase encoded, and e) recovery of the oils or lipids from the plants ,
- the polyunsaturated C 2 o- or C 22 -fatty acids prepared in the process according to the invention contain at least four, five or six double bonds.
- the fatty acids contain five or six double bonds.
- saturated fatty acids are little or not reacted with the nucleic acids used in the process. Little is to be understood that compared to polyunsaturated fatty acids, the saturated fatty acids with less than 5% of the activity, advantageously less than 3%, particularly advantageous with less than 2%, most preferably less than 1; 0.5; 0.25 or 0.125% are implemented. These produced fatty acids can be produced as the only product in the process or present in a fatty acid mixture.
- nucleic acid sequences used in the method according to the invention are isolated nucleic acid sequences which are suitable for ⁇ -6 polypeptides.
- ARA arachidonic acid
- EPA eicosape ⁇ tenic acid
- DHA docosahexaenoic acid
- the polyunsaturated C 20 - or C 3-8 fatty acids containing at least four double bonds are arachidonic acid.
- eicosapentaenoic acid or docosahexaenoic acid or mixtures thereof are prepared as polyunsaturated C 20 - or C 22 -fatty acids having at least four double bonds.
- Mixtures of ARA, EPA and DHA can also be prepared by the process according to the invention.
- Arachidonic acid or eicosapentaenoic acid having a content of at least 15, 16, 17, 18, 19 or 20% by weight, preferably 25, 30, 35 or 40% by weight, particularly preferably 45.50, are advantageous in the process according to the invention , 55 or 60 wt .-% based on the total triglyceride content produced in the transgenic plant.
- docosahexaenoic acid is produced with a content of at least 4, 5 or 6% by weight, advantageously with a content of 7, 8, 9 or 10% by weight, based on the total triglyceride content in the transgenic plant.
- triglycerides less than 0.5; 0.4; 0.3; 0.2 or 0.1% by weight, advantageously less than 0.09; 0.08; 0.07; 0.06 or 0.05% by weight, more preferably less than 0.04; 0.03; 0.02 or 0.01 wt .-% based on the total fatty acid content of the triglycerides of a polyunsaturated fatty acid selected from the group of c22: 4 ⁇ 7 ' 10 ' 13 '16 -, C22 . 5 ⁇ 4,7,1O, 13, 1 6 _ qThe c2 2: 5 ⁇ 7 '10' 13 '16' 19 fatty acid be present.
- the polyunsaturated fatty acids produced in the process are advantageously bound in triacylglycerides, but may also occur as free fatty acids or bound in the form of other fatty acid esters in the organisms. They may be present as "pure products" or advantageously in the form of mixtures of different fatty acids or mixtures of different glycerides.
- fatty acid esters having polyunsaturated C 2 o- and / or C 22 -fatty acid molecules having at least four double bonds in the fatty acid ester, advantageously having at least five or six double bonds in the fatty acid ester, are advantageously prepared.
- polyunsaturated fatty acids are particularly advantageously selected from the group ⁇ -6-docosatetraenoic acid c22: 4 ⁇ 7 ' 10 ' 13 '16 , ⁇ -6-docosapentaenoic acid c22: 5 ⁇ 4 ' 7 ' i ⁇ 13 ' 16 or ⁇ -3-docosapentaenoic acid c22: 5 ⁇ 7 ' 10 ' 13 ' 16 ' 19 was produced in the triglycerides at less than 0.5% by weight, based on the total fatty acid content of the triglycerides.
- the fatty acid esters with polyunsaturated C 2 o- and / or C 22 -fatty acid molecules can be prepared from the organisms used for the preparation of the fatty acid esters in the form of an oil or lipid, for example in the form of compounds such as sphingolipids, phosphoglycerides, lipids, glycolipids, such as Glycosphingolipids, phospholipids such as phosphatidylethanolamine, phosphatidylcholine, phosphatidylserine, phosphatidylglycerol, phosphatidylinositol or diphosphatidylglycerol, monoacylglycerides, diacylglycerides, triacylglycerides or other fatty acid esters such as the acetyl-coenzymeA esters which contain the polyunsaturated fatty acids having at least four, five or six, preferably five or six double bonds, they are advantageously isolated in the form of their diacylg
- the polyunsaturated fatty acids are also included as free fatty acids or bound in other compounds in the organisms beneficial to the plants.
- the various compounds mentioned above are present in the organisms in an approximate distribution of 80 to 90% by weight of triglycerides, 2 to 5% by weight of diglycerides, 5 to 10% by weight of monoglycerides, 1 to 5 wt .-% of free fatty acids, 2 to 8 wt .-% phospholipids ago, wherein the sum of the various compounds to 100 wt .-% complements.
- the LCPUFAs produced such as arachidonic acid and eicosapentaenoic acid, having a content of at least 15% by weight, advantageously of at least 16 or 17% by weight, preferably of at least 18, 19 or 20% by weight, are particularly preferred of at least 21, 22, 23, 24 or 25 wt .-%, most preferably of at least 26, 27, 28, 29 or 30 wt .-% based on the total fatty acids in the transgenic organisms advantageously produced in a transgenic plant.
- the fatty acids are prepared in bound form.
- these unsaturated fatty acids can be brought to the sn1, sn2 and / or sn3 position of the advantageously prepared triglycerides.
- linoleic acid C18: 2 or linolenic acid (C18: 3) are undergoing several reaction steps, the end products of the method such as arachidonic acid (ARA), eicosapentaenoic acid (EPA) or docosapentaenoic acid (DHA) are not as absolute pure products, there are always small traces of precursors in the final product. If both linoleic acid and linolenic acid are present in the starting organism or in the parent plant, for example, the end products such as ARA, EPA or DHA are generally present as mixtures.
- ARA arachidonic acid
- EPA eicosapentaenoic acid
- DHA docosapentaenoic acid
- the precursors linoleic acid and / or linolenic acid should advantageously not more than 20 wt .-%, preferably not more than 15 wt .-%, more preferably not more than 10 wt .-%, most preferably not more than 5 wt .-% based amount to the amount of each end product.
- ARA, ARA and EPA, EPA and DHA or only DHA are bound in the process according to the invention or prepared as free acids in a transgenic plant as end products.
- the compounds ARA, EPA and DHA are prepared simultaneously, they are advantageously used in a ratio of at least 1: 1: 2 (EPA: ARA: DHA), preferably of at least 1: 1: 3, preferably of 1: 1: 4 preferably prepared from 1: 1: 5. If ARA and EPA are produced in the process, they are advantageously prepared in a ratio of at least 5: 1 to at least 1: 5. If EPA and DHA are produced in the process, they are advantageously prepared in a ratio of at least 5: 1 to at least 1: 5.
- Fatty acid esters or fatty acid mixtures which have been prepared by the process according to the invention advantageously contain 6 to 15% palmitic acid, 1 to 6% stearic acid; 7 - 85% oleic acid; 0.5 to 8% of vaccenic acid, 0.1 to 1% of arachidic acid, 7 to 25% of saturated fatty acids, 8 to 85% of monounsaturated fatty acids and 60 to 85% of polyunsaturated fatty acids in each case based on 100% and on the total fatty acid content of the organisms.
- Fatty acid are preferably at least 0.1 in the fatty acid esters or fatty acid mixtures; 0.2; 0.3; 0.4; 0.5; 0.6; 0.7; 0.8; 0.9 or 1% based on the total fatty acid content of arachidonic acid.
- the fatty acid esters or fatty acid mixtures which have been prepared by the process according to the invention contain advantageous fatty acids selected from the group of the fatty acids erucic acid (13-docosaic acid), sterculic acid (9,10-methylene octadec-9-enoic acid), malvalic acid (8,9-methylheptadec-8-enoic acid), chaulmoogric acid (cyclopentenodecanoic acid), Furan fatty acid (9,12-epoxy-octadeca-9,11-dienoic acid), vernonic acid (9,10-epoxyoctadec-12-enoic acid), taric acid (6-octadecynoic acid), 6-nonadecynoic acid, santalbinic acid (t11-octadecene -9-ynoic acid), 6,9-octadecenynoic acid, pyrulic acid (t10-heptade
- Octadecatrienoic acid Octadecatrienoic acid
- elecetic acid (9c11t13t octadecatrienoic acid), jacric acid (8c10t12c octadecatrienoic acid), punicic acid (9c11t13c octadecatrienoic acid), parinaric acid (9c11t13t15c octadecatetraenoic acid), pinolenic acid (all-cis-5,9,12-octadecatrienoic acid), LaballenLitere (5,6-Octadecadienallen Textre), Ricinolklare (12-Hydroxyölklare) and / or Coriolinklare (13-Hydroxy-9c, 11 t-Octadecadienonklare).
- the abovementioned fatty acids are generally advantageously present only in small amounts in the fatty acid esters or fatty acid mixtures prepared by the process according to the invention, that is to say they come to less than 30%, preferably less than 25%, 24%, 23, based on the total fatty acids %, 22% or 21%, more preferably less than 20%, 15%, 10%, 9%, 8%, 7%, 6% or 5%, most preferably less than 4%, 3%, 2 % or 1% ago.
- An increase in the yield of polyunsaturated fatty acids of at least 50%, advantageously of at least 80%, particularly advantageously of at least 100%, very particularly advantageously of at least 150%, compared with the non-transgenic plant can be achieved by the nucleic acid sequences according to the invention or in the method according to the invention such as Arabidopsis, flax, rapeseed, soy or Camelina can be achieved in the comparison in the GC analysis.
- chemically pure polyunsaturated fatty acids or fatty acid compositions can be prepared by the methods described above.
- the fatty acids or fatty acid compositions are isolated from the plant in a known manner, for example via extraction, distillation, crystallization, chromatography or combinations of these methods.
- These chemically pure fatty acids or fatty acid compositions are advantageous for applications in the food industry, the cosmetics industry and especially the pharmaceutical industry.
- all plants are suitable as organism for the production in the process according to the invention.
- oil crops or crops are used in the process.
- plants in principle, all plants are in question, which are able to synthesize fatty acids as all dicotyledonous or monocotyledonous plants, algae or mosses.
- Advantageous plants are selected from the group of the plant families Adelotheciaceae, Anacardiaceae, Asteraceae, Apiaceae, Betulaceae, Boraginaceae, Brassicadown, Bromeliaceae, Caricaceae, Cannabaceae, Convolvulaceae, Chenopodiaceae, Crypthecodiniaceae, Cucurbitaceae, Ditrichaceae, Elaeagnaceae, Ericaceae, Euphorbiaceae , Fabaceae, Geraniaceae, Gramineae, Juglandaceae, Lauraceae, Leguminose, Linaceae, Prasinophyceae or vegetables or ornamental plants such as Tagetes.
- Examples include the following plants selected from the group: Adelotheciaceae as the genera Physcomitrella eg the genus and species Physcomitrella patens, Anacardiaceae such as the genera Pistacia, Mangifera, Anacardium eg the genus and species Pistacia vera [pistachio], Mangifer indica [Mango ] or Anacardium occidentale [Cashew], Asteraceae such as the genera Calendula, Carthage, Centaurea, Cichorium, Cynara, Helianthus, Lactuca, Locusta, Tagetes, Valeriana eg the genus and species Calendula officinalis [Gardening Marigold], Carthamus tinctorius [Dyer's Thistle , safflower], Centaurea cyanus [cornflower], Cichorium intybus [chicory], Cynara scolymus [Artichoke], Helianthus annus [sunflower],
- Elaeagnaceae such as the genus Elaeagnus eg the genus and Art Olea europaea [Olive]
- Ericaceae as the genus Kalmia eg the genera and species Kalmia latifolia, Kalmia angustifolia, Kalmia microphylla, Kalmia polifolia, Kalmia occidentalis, Cistus chamaerhodendros or Kalmia lucida [Berglorbeer]
- Euphorbiaceae such as the genera Manihot, Janipha, Jatropha Ricinus eg the genera and species Manihot utilissima, Janipha manihot ,, Jatropha manihot, Manihot aipil, Manihot dulcis, Manihot manihot, Manihot melanobasis, Manihot esculenta [Manihot] or Ricinus communis [Castor], Fabaceae
- obtusifolia Funaria muhlenbergii, Funaria orcuttii, Funaria plano convexa, Funaria polaris, Funaria ravenelii, Funaria rubriseta, Funaria serrata, Funaria sonorae, Funaria sublimbatus, Funaria tucsoni Physcomitrella californica, Physcomitrella patens, Physcomitrella readeri, Physcomitrium spp., Physcomitrium californicum, Physcomitrium collenchymatum, Physcomitrium coloradense, Physcomitrium cupuliferum, Physcomitrium drummondii, Physcomitrium eurystomum, Physcomitrium flexifolium, Physcomitrium hookeri, Physcomitrium hooke ⁇ var.
- [Cayenne pepper] such as the genera Hordeum, Seeale, Avena, Sorghum, Andropogon, Holcus, Panicum, Oryza, Zea (maize), Triticum eg the genera and species Hordeum vulgare, Hordeum jubatum, Hordeum murinum, Hordeum secalinum, Hordeum distichon Hordeum aegiceras, Hordeum hexastichonum, Hordeum hexastichum, Hordeum irregular, Hordeum sativum, Hordeum secalinum [barley], Seeale cereale [rye], Avena sativa, Avena fatua, Avena byzantina, Avena fatua var.
- Sativa Avena hybrida [Oats], Sorghum bicolor, Sorghum halepense, Sorghum saccharatum, Sorghum vulgaris, Andropogon drummondii, Holcus bicolor, Holcus sorghum, Sorghum aethiopicum, Sorghum arundinaceum, Sorghum caffrorum, Sorghum cernuum, Sorghum bathna, Sorghum drummondii, Sorghum durra, Sorghum guineense, Sorghum lanceolatum, sorghum nervosa, sorghum saccharatum, sorghum subglabrescens, sorghum verticilliflorum, sorghum vulgaris, holcus halepensis, sorghum miliaceum, panicum militaceum [millet], oryza sativa, oryza latifolia
- Macadamia intergrifolia [Macadamia]
- Prasinophyceae such as the genera Nephroselmis, Prasinococcus, Scherffelia, Tetraselmis, Mantoniella, Ostreococcus e.g. the genera and species Nephroselmis olivacea, Prasinococcus capsulatus, Scherffelia dubia, Tetraselmis chui, Tetraselmis suecica, Mantoniella squamata, Ostreococcus tauri, Rubiaceae such as the genus Coffea e.g.
- Cofea spp. Coffea arabica, Coffea canephora or Coffea liberica [coffee]
- Scrophulariaceae such as the genus Verbascum e.g. the genera and species Verbascum blattaria, Verbascum chaixii, Verbascum densiflorum, Verbascum lagurus, Verbascum longifolium, Verbascum lychnitis, Verbascum nigrum, Verbascum olympicum, Verbascum phlomoides, Verbascum phenicum, Verbascum pulverulentum or Verbascum thapsus [Mullein], Solanaceae such as the genera Capsicum, Nicotiana , Solanum, Lycopersicon eg the genera and species Capsicum annuum, Capsicum annuum var.
- Capsicum frutescens [pepper], Capsicum annuum [paprika], Nicotiana tabacum, Nicotiana alata, Nicotiana attenuata, Nicotiana glauca, Nicotiana slowdorffii, Nicotiana obtusifolia, Nicotiana quadrivalvis, Nicotiana repanda, Nicotiana rustica, Nicotiana sylvestris [tobacco], Solanum tuberosum [potato], Solanum melongena [eggplant] Lycopersicon esculentum, Lycopersicon lycopersicum., Lycopersicon pyriforme, Solanum integrifolium or Solanum lycopersicum [tomato], Sterculiaceae such as the genus Theobroma eg the genus and species Theobroma cacao [cocoa] or Theaceae such as the genus Camellia e.g.
- transgenic plants such as dicotyledonous or monocotyledonous plants are used. It is particularly advantageous in the process of the invention to use oil crop plants which contain large amounts of lipid compounds, such as peanut, rapeseed, canola, sunflower, safflower (Carthamus tinetoria), poppy, mustard, hemp, castor, olive, sesame, calendula, punica, evening primrose, mullein , Thistle, wild roses, hazelnut, almond, macadamia, avocado, bay leaf, pumpkin, flax, soya, pistachio, borage, trees (oil palm, coconut or walnut), or there are useful crops such as maize, wheat, rye, oats, Triticale, rice, barley, cotton, cassava, pepper, tagetes, solanaceae plants, such as Potato, tobacco, eggplant and tomato, Vicia species, pea, alfaifa or bush plants (coffee, cocoa, tea),
- lipid compounds such as
- Preferred plants according to the invention are oil crop plants, such as peanut, rapeseed, canola, sunflower, safflower, poppy, mustard, hemp, castor, olive, calendula, punica, evening primrose, pumpkin, flax, soy, borage, trees (oil palm, coconut).
- Particularly preferred are C18: 2 and / or C18: 3 fatty acid rich plants such as sunflower, safflower, tobacco, mullein, sesame, cotton, pumpkin, poppy, evening primrose, walnut, flax, hemp, thistle or safflower.
- plants such as safflower, sunflower, poppy, evening primrose, walnut, flax or hemp.
- genes of fatty acid or lipid metabolism may advantageously be used in combination with the inventive ⁇ -6-desaturase (s), ⁇ -6 elongase (s), ⁇ -5-desaturase (s), ⁇ -5 Elongase (s), ⁇ -4-desaturase (s), ⁇ -12-desaturase (s) and / or ⁇ -3-desaturase (s) [in the context of this application, the plural shall contain the singular and vice versa] in the process of Production of polyunsaturated fatty acids are used.
- the fatty acids can also be fed from the outside.
- Preferred substrates are the linoleic acid (C18: 2 ⁇ 9 '12 ), and / or the ⁇ -linolenic acid (C18: 3 ⁇ 69 12 ).
- ⁇ 12-desaturase oleic acid C18: 1 ⁇ 9
- C18: 2 ⁇ 9 12 linoleic acid
- Nucleic acids used in the method according to the invention are advantageously derived from plants such as algae, for example algae of the family Prasinophyceae as from the genera Heteromastix, Mammella, Mantoniella, Micromonas, Nephroselmis, Ostreococcus, Prasinocladus, Prasinococcus, Pseudoscourfielda, Pycnococcus, Pyramimonas, Scherffelia or Tetraselmis such as the genera and Species Heteromastix longifillis, Mamiella gilva, Mantoniella squamata, Micromonas pusilla, Nephroselmis olivacea, Nephroselmis pyriformis, Nephroselmis rotunda, Ostreococcus tauri, Ostreococcus sp. Prasinocladus ascus, Prasinocladus lubricus, Pycnoc
- the nucleic acids used are advantageously derived from algae of the genus Ostreococcus. Further advantageous organisms are diatoms such as Thalassiosira, Phaeodactylum or Thraustochytrium or fungi such as Thraustochytrium or Phytophthora.
- nucleic acid sequences or their derivative or homologs which code for polypeptides which still possess the enzymatic activity of the proteins encoded by nucleic acid sequences.
- These sequences are used singly or in combination with those for ⁇ 6-desaturase, ⁇ 6-oligonase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and / or ⁇ 3-desaturase-encoding nucleic acid sequences are cloned in expression constructs and used for introduction and expression in the plants. By their construction, these expression constructs enable a favorable optimal synthesis of the polyunsaturated fatty acids produced in the process according to the invention.
- the method further comprises the step of obtaining a cell or whole plant containing the nucleic acid sequences used in the method, wherein the cell and / or the plant is infected with a nucleic acid sequence of the invention which is responsible for the ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ -5-desaturase, ⁇ -5-ionogase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3 Desaturase, a gene construct or a vector as described below, alone or in combination with other nucleic acid sequences that code for proteins of the fatty acid or lipid metabolism is transformed.
- a nucleic acid sequence of the invention which is responsible for the ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ -5-desaturase, ⁇ -5-ionogase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3 Desaturase, a gene construct or
- this method further comprises the step of recovering the oils, lipids or free fatty acids from the cell or plant.
- the culture may be, for example, a fermentation culture, for example in the case of cultivation of plant cells or a greenhouse or field crop of a plant.
- the cell or plant thus produced is advantageously a cell of an oil-producing organism such as an oil crop such as peanut, canola, canola, flax, hemp, peanut, soybean, safflower, hemp, sunflower or borage.
- Cultivation is, for example, culturing in the case of plant cells, tissue or organs on or in a nutrient medium or the whole plant on or in a substrate, for example in hydroponics, potting soil or on arable land.
- Natural genetic environment means the natural genomic or chromosomal locus in the organ of origin or presence in a genomic library.
- the natural genetic environment of the nucleic acid sequence is preferably at least partially conserved.
- the environment flanks the nucleic acid sequence at least on one side and has a sequence length of at least 50 bp, preferably at least 500 bp, more preferably at least 1000 bp, most preferably at least 5000 bp.
- non-natural, synthetic artificial
- transgenic plants within the meaning of the invention are understood to mean that the nucleic acids used in the method are not in their natural position in the genome of the plant, in which case the nucleic acids can be expressed homologously or heterologously.
- transgene also means, as mentioned, that the nucleic acids according to the invention are in their natural place in the genome of the plant, but that the sequence has been changed compared to the natural sequence and / or the regulatory sequences of the natural sequences have been altered.
- Transgenic is preferably understood to mean the expression of the nucleic acids according to the invention at a non-natural site in the genome, that is to say a homologous or preferably heterologous expression of the nucleic acids is present.
- plants which are able to synthesize fatty acids, especially unsaturated fatty acids or are suitable for the expression of recombinant genes are suitable in principle as host organisms for the nucleic acids, the expression cassette or the vector used in the method according to the invention.
- Examples include plants such as Arabidopsis, Asteraceae such as calendula or crops such as soybean, peanut, castor, sunflower, corn, cotton, flax, rapeseed, coconut, oil palm, dyer safflower (Carthamus tinctorius) or cocoa bean.
- the plants according to the invention include plant cells and certain tissues, organs and parts of plants in all their forms, such as anthhers, fibers, root hair, stems, embryos, callosis, kotelydons, petioles, crops, plant tissue, reproductive tissue and Cell cultures derived from the actual transgenic plant and / or used to produce the transgenic plant.
- Transgenic plants containing the polyunsaturated fatty acids synthesized in the process according to the invention can advantageously be marketed directly without the synthesized oils, lipids or fatty acids having to be isolated.
- Plants in the process according to the invention include whole plants and all plant parts, plant organs or plant parts such as leaves, stems, seeds, roots, tubers, anthers, fibers, root hairs, stems, embryos, kaIIi, kotelydons,
- the seed includes all seed parts such as the seed shells, epidermis and sperm cells, endosperm or embryonic tissue.
- the compounds prepared in the process according to the invention can also be advantageous plants from the organisms in the form of their oils, fat, lipids and / or free Be isolated fatty acids. Polyunsaturated fatty acids produced by this process can be harvested by harvesting the organisms either from the culture in which they grow or from the field. This can be done by pressing or extraction of the plant parts, preferably the plant seeds.
- the oils, fats, lipids and / or free fatty acids by so-called cold beat or cold pressing can be obtained without supplying heat by pressing.
- the plant parts, especially the seeds, to be easier to digest they are first crushed, steamed or roasted.
- the thus pretreated seeds can then be pressed or extracted with solvents such as warm hexane.
- the solvent is removed again.
- more than 96% of the compounds prepared in the process can be isolated.
- the products thus obtained are further processed, that is refined.
- the mucilages and turbid matter are removed.
- the so-called desliming can be carried out enzymatically or, for example, chemically / physically by adding acid, such as phosphoric acid.
- the free ones such as phosphoric acid.
- Fatty acids are removed by treatment with a base, for example sodium hydroxide solution.
- a base for example sodium hydroxide solution.
- the product obtained is thoroughly washed with water to remove the lye remaining in the product and dried.
- the products are subjected to bleaching with, for example, bleaching earth or activated carbon. Finally, the product is still deodorized, for example, with steam.
- An embodiment of the invention is the use of the oils, lipids, fatty acids and / or fatty acid composition prepared by the process of the invention or by mixing these oils, lipids and / or fatty acids with animal, microbial or vegetable oils, lipids or fatty acids in feed, food, cosmetics or pharmaceuticals.
- the oils, lipids, fatty acids prepared in the process according to the invention may be mixed with other oils, lipids, fatty acids or fatty acid mixtures of animal origin, such as those known to those skilled in the art, for example. Fish oils are used.
- oil is understood as meaning a fatty acid mixture which contains unsaturated, saturated, preferably esterified fatty acid (s), advantageously bound in triglycerides. It is preferred that the oil, lipid or fat contain a high proportion of polyunsaturated free or advantageously esterified fatty acid (s), in particular linoleic acid, ⁇ -linolenic acid, dihomo- ⁇ -linolenic acid, arachidonic acid, ⁇ -linolenic acid, stearidonic acid, eicosatetraenoic acid, eicosapentaenoic acid, Docosapentaenoic acid or docosahexaenoic acid, particularly advantageously arachidonic acid, eicosapentaenoic acid or docosahexaenoic acid.
- s polyunsaturated free or advantageously esterified fatty acid
- the proportion of unsaturated esterified fatty acids is about 30%, more preferred is a proportion of 50%, even more preferred is a proportion of 60%, 70%, 80% or more.
- the proportion of fatty acid after conversion of the fatty acids into the methyl esters can be determined by transesterification by gas chromatography.
- the oil, lipid or fat may contain various other saturated or unsaturated fatty acids, eg calendulic acid, Palmitin, palmitoleic, stearic, oleic acid, etc., included. In particular, depending on the starting organism, the proportion of the various fatty acids in the oil or fat may vary.
- the polyunsaturated fatty acids having advantageously at least four double bonds prepared in the process are, as described above, for example sphingolipids, phosphoglycerides, lipids, glycolipids, phospholipids, monoacylglycerols, diacylglycerides, triacylglycerides or other fatty acid esters, preferably triacylglycerides.
- the polyunsaturated fatty acids containing, for example, an alkali treatment such as aqueous KOH or NaOH or acid hydrolysis advantageously in the presence of an alcohol such as methanol or ethanol or via an enzymatic cleavage liberate and isolate via, for example, phase separation and subsequent acidification via, for example, H 2 SO 4 .
- an alkali treatment such as aqueous KOH or NaOH or acid hydrolysis
- an alcohol such as methanol or ethanol or via an enzymatic cleavage
- the release of the fatty acids can also be carried out directly without the workup described above.
- the nucleic acids used in the method can advantageously be either a plant cell or plant, either on a separate plasmid or advantageously integrated into the genome of the host cell.
- integration may be at random or by such recombination as to replace the native gene with the incorporated copy, thereby modulating the production of the desired compound by the cell, or by using a gene in trans in that the gene is functionally linked to a functional expression unit which contains at least one sequence ensuring the expression of a gene and at least one sequence ensuring the polyadenylation of a functionally transcribed gene.
- the nucleic acids are brought into the plants via multi-expression cassettes or constructs for multiparallel expression in the organisms, advantageously for multiparallel seed-specific expression of genes. Moose and algae are the only known plant systems that have significant
- PUFAs polyunsaturated fatty acids
- ARA arachidonic acid
- EPA eicosapentaenoic acid
- DHA docosahexaenoic acid
- Moose contain PUFAs in membrane lipids, while algae, algae-related organisms and some fungi also accumulate significant levels of PUFAs in the triacylglycerol fraction. Therefore, nucleic acid molecules isolated from strains which also accumulate PUFAs in the triacylglycerol fraction are particularly advantageous for the process of the invention and thus for modification of the lipid and PUFA production system in a host, in particular plants such as oilseed crops, for example oilseed rape.
- ARA arachidonic acid
- EPA eicosapentaenoic acid
- DHA docosahexaenoic acid
- Synthase (s), hydroperoxide lyase (s) or fatty acid elongase (s) encode advantageously C 16 -, C 18 - or C 2 o fatty acids.
- the fatty acids reacted as substrates in the process are preferably reacted in the form of their acyl-CoA esters and / or their phospholipid esters.
- the polyunsaturated C 18 -fatty acids must first be desaturated by the enzymatic activity of a desaturase and then be extended by at least two carbon atoms via an elongase.
- this enzyme activity leads to C 20 -fatty acids, and after two rounds of elongation to C 22 -fatty acids.
- Desaturases and elongases used in the activity of the method according to the invention lead to C 2O- and / or C 22 -FEW acids with at least four double bonds in the fatty acid molecule, preferably to C 20 -fatty acids having at least four double bonds, particularly preferably to C 20 and / or C 22 fatty acids having at least five or six double bonds, most preferably having six double bonds in the molecule.
- Particularly preferred as products of the method according to the invention are arachidonic acid, eicosapentaenoic acid and / or docosaheic acid.
- the C 20 and / or C 22 fatty acids having at least four double bonds in the fatty acid can be synthesized by the enzymatic activity according to the invention in the form of the free fatty acid or in the form of the esters, such as phospholipids, glycolipids, sphingolipids, phosphoglycerides, monoacylglycerol, diacylglycerol or triacylglycerol. be extended.
- the preferred biosynthesis site of fatty acids, oils, lipids or fats in the advantageously used plants is, for example, generally the seeds or cell layers of the seed, so that a seed-specific expression of the nucleic acids used in the method is useful.
- biosynthesis of fatty acids, oils or lipids need not be limited to the seed tissue, but may also be tissue-specific in all other parts of the plant - for example in epidermal cells or in the tubers.
- the processes can be carried out in the process polyunsaturated fatty acids at least 5%, preferably at least 10%, more preferably at least 20%, most preferably at least 50% compared to the wild-type plant, which does not contain the recombinant nucleic acids increased.
- the polyunsaturated fatty acids produced in the plants used in the process can in principle be increased in two ways.
- the pool of free polyunsaturated fatty acids and / or the proportion of esterified polyunsaturated fatty acids produced by the process can be increased.
- the process according to the invention increases the pool of esterified polyunsaturated fatty acids in the transgenic plant.
- the fatty acids obtained in the process are also suitable as starting material for the chemical synthesis of further products of value. They may be used, for example, in combination with each other or solely for the manufacture of pharmaceuticals, foods, animal feed or cosmetics.
- a further subject of the invention are isolated nucleic acid sequences which code for polypeptides with ⁇ -6-desaturase activity, selected from the group: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 1, b) nucleic acid sequences which are suitable for a protein having the sequence shown in SEQ Or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 1 which code for polypeptides with at least 70% identity at the amino acid level with SEQ ID NO: 2 and have a ⁇ 6-desaturase activity.
- a further subject of the invention are isolated nucleic acid sequences which code for polypeptides with ⁇ 6-elongase activity, selected from the group: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 3, SEQ ID NO: 5 or SEQ ID NO: 7, b) nucleic acid sequences which code for a protein having the sequence shown in SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8, or c) derivatives of SEQ ID NO: 3, SEQ ID NO: 5 or SEQ ID NO: 7, which code for polypeptides having at least 70% identity at the amino acid level with SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8 and have a ⁇ 6-elongase activity.
- a further subject of the invention are isolated nucleic acid sequences which code for polypeptides with ⁇ 5-desaturase activity, selected from the group: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 9, b) nucleic acid sequences which code for a protein having the sequence shown in SEQ ID NO: 10, or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 9, which for polypeptides having at least 40% identity on Aminoklareebe ⁇ e with SEQ ID NO: 10 encode and have a ⁇ -5-desaturase activity.
- nucleic acid sequences which code for polypeptides having ⁇ -3-desaturase activity, selected from the group: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 23, b) nucleic acid sequences which are suitable for a protein having the sequence shown in SEQ Or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 23, which code for polypeptides having at least 40% identity at the amino acid level with SEQ ID NO: 24 and have an ⁇ -3-desaturase activity.
- a further subject of the invention are isolated nucleic acid sequences which code for polypeptides with ⁇ -12-desaturase activity, selected from the group consisting of: a) a nucleic acid sequence with the sequence shown in SEQ ID NO: 25, or b) nucleic acid sequences which are suitable for a protein with the protein disclosed in US Pat Or SEQ ID NO: 26 encode derivatives of the nucleic acid sequence shown in SEQ ID NO: 25 which are suitable for
- a further subject of the invention are gene constructs which contain the nucleic acid sequences according to the invention SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 23 or SEQ ID NO: 25, wherein the nucleic acid is operably linked to one or more regulatory signals.
- acyl-CoA dehydrogenase acy
- biosynthesis genes of the fatty acid or lipid metabolism selected from the group of ⁇ -4-desaturase, ⁇ -8-desaturase, ⁇ -9 elongase or ⁇ -5 elongase are additionally contained.
- all the nucleic acid sequences used in the method according to the invention are derived from an organism such as a plant or a microorganism.
- the nucleic acid sequences are derived from algae such as Ostreococcus, fungi such as Phytophthora or diatoms such as Thalassiosira.
- the nucleic acid sequences used in the method which are useful for ⁇ -6 proteins.
- an expression cassette nucleic acid construct
- a ⁇ 6-desaturase, a ⁇ 6-elongase, a ⁇ 5-desaturase, a ⁇ 5-elongase, a ⁇ 4-desaturase, a ⁇ 12-desaturase and / or an ⁇ -3-desaturase be included.
- the nucleic acids used in the method are advantageously subjected to amplification and ligation in a known manner.
- the procedure is based on the protocol of the Pfu DNA polymerase or of a Pfu / Taq DNA polymerase mixture.
- the primers are selected on the basis of the sequence to be amplified. Conveniently, the primer (s) should be chosen so that the amplicon comprises the entire codogenic sequence from the start to the stop codon.
- the amplificate is conveniently analyzed. For example, the analysis can be carried out after gel electrophoretic separation in terms of quality and quantity. Subsequently, the amplificate can be purified according to a standard protocol (eg Qiagen).
- Suitable cloning vectors are well known to those skilled in the art. These include, in particular, vectors which can be replicated in microbial systems, ie in particular vectors which ensure efficient cloning in yeasts or fungi, and which enable stable transformation of plants. Particular mention should be made of various binary and co-integrated vector systems suitable for T-DNA-mediated transformation. Such vector systems are usually characterized in that they contain at least the vir genes required for the Agrobacterium-mediated transformation as well as the T-DNA limiting sequences (T-DNA border).
- these vector systems also include other cis-regulatory regions such as promoters and terminators and / or selection markers, with which correspondingly transformed organisms can be identified.
- vir genes and T-DNA sequences are located on the same vector
- binary systems are based on at least two vectors, one of them vir genes, but no T-DNA and a second T-DNA, but no carries vir gene.
- the latter vectors are relatively small, easy to manipulate and replicate in both E. coli and Agrobacterium.
- These binary vectors include vectors of the series pBIB-HYG, pPZP, pBecks, pGreen.
- Bin19, pBI101, pBinAR, pGPTV and pCAMBIA are preferably used according to the invention.
- An overview of binary vectors and their use is given by Hellens et al, Trends in Plant Science (2000) 5, 446-151.
- the vectors can first be linearized with restriction endonuclease (s) and then enzymatically modified in a suitable manner. The vector is then purified and an aliquot used for cloning. In cloning, the enzymatically cut and if necessary purified amplicon is cloned with similarly prepared vector fragments using ligase.
- a particular nucleic acid construct or vector or plasmid construct can have one or more codogenic gene segments.
- the codogenic gene segments in these constructs are functionally linked to regulatory sequences.
- the regulatory sequences include, in particular, plant sequences such as the promoters and terminators described above.
- the constructs can advantageously be stably propagated in microorganisms, in particular Escherichia coli and Agrobacterium tumefaciens, under selective conditions and enable a transfer of heterologous DNA into plants or microorganisms.
- nucleic acids used in the method can be introduced into organisms such as microorganisms or advantageously plants and thus used in plant transformation, such as those published in and cited therein Molecular Biology and Biotechnology (CRC Press, Boca Raton, Florida), Chapter 6/7, pp. 71-119 (1993); FF White, Vectors for Gene Transfer to Higher Plants; in: Transgenic Plants, Vol. 1, Engineering and Utilization, eds .: Kung and R. Wu, Academic Press, 1993, 15-38; Genes Transfer, in: Transgenic Plants, Vol. 1, Engineering and Utilization, eds. Kung and R.
- nucleic acids used in the method, the inventive nucleic acids and nucleic acid constructs and / or vectors can thus be used advantageously for the genetic modification of a broad spectrum of organisms to plants, so that they become better and / or more efficient producers of PUFAs.
- the number or activity of ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and ⁇ -3 -Desaturase proteins or genes can be increased so that larger amounts of the gene products and thus ultimately larger amounts of the polyunsaturated fatty acids prepared by the process according to the invention are produced with at least four double bonds. Also, a de novo synthesis in a plant lacking the activity and ability to biosynthesize the compounds prior to introduction of the corresponding gene (s) is possible. Correspond- this applies to the combination with other desaturases or elongases or other enzymes from the fatty acid and lipid metabolism.
- the use of different divergent, ie different sequences on DNA sequence level may be advantageous or the use of promoters for gene expression, which allows a different time gene expression, for example, depending on the degree of ripeness of a seed or oil-storing tissue
- a ⁇ 6-desaturase, a ⁇ 6-elongase, a ⁇ 5-desaturase, a ⁇ 5-elongase, a ⁇ 4-desaturase, a ⁇ 12-desaturase and / or an omega-3 desaturase gene in a plant alone or in combination with other genes into a cell can not only increase the biosynthetic flux to the final product, but also increase or de novo create the corresponding triacylglycerol composition.
- the number or activity of other genes necessary for the import of nutrients necessary for the biosynthesis of one or more fatty acids, oils, polar and / or neutral lipids may be increased, such that the concentration of these precursors, cofactors or intermediates within the cells or within the storage compartment, thereby further increasing the ability of the cells to produce PUFAs, as described below.
- ⁇ 6-desaturase By optimizing the activity or increasing the number of one or more ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12- Desaturase and / or ⁇ -3-desaturase genes involved in the biosynthesis of these compounds, or by disrupting the activity of one or more genes involved in the degradation of these compounds, may allow the yield, production and / or to increase the efficiency of the production of fatty acid and lipid molecules from plants.
- the isolated nucleic acid molecules used in the method of the invention encode proteins or parts thereof, wherein the proteins or the single protein or parts thereof contain an amino acid sequence sufficiently homologous to an amino acid sequence represented in the sequences SEQ ID NO: 2, SEQ ID NO 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20 , SEQ ID NO: 22, SEQ ID NO: 24 or SEQ ID NO: 26, so that the proteins or parts thereof still contain a ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase , ⁇ -5 elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase activity.
- the proteins or portions thereof encoded by the nucleic acid molecule (s) still have their essential enzymatic activity and
- the proteins encoded by the nucleic acid molecules are at least about 40%, preferably at least about 50% or 60%, and more preferably at least about 70%, 80% or 90%, and most preferably at least about 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to those shown in SEQ ID NO: 2, SEQ ID NO : 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQ ID NO: 24 or SEQ ID NO: 26 shown amino acid sequences.
- the homology was calculated over the entire amino acid or nucleic acid sequence range.
- a number of programs that are based on different algorithms are available to the person skilled in the art.
- the algorithms of Needleman and Wunsch or Smith and Waterman provide particularly reliable results.
- the program PiIeUp was used (J. Mol. Evolution., 25, 351-360, 1987, Higgins et al., CABIOS, 5 1989: 151-153) or the programs Gap and BestFit [Needleman and Wunsch (J. Mol. Biol. 48: 443-453 (1970) and Smith and Waterman (Adv. Appl. Math.
- Desaturase is understood to be superior to that represented by the sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 and their derivatives encoded proteins / enzymes in comparison still have at least one enzymatic activity of at least 10%, preferably 20%, more preferably 30% and very particularly 40% and thus the metabolism of compounds necessary for building up fatty acids, fatty acid esters such as diacylglycerides and / or triacylglycerides in a
- Carbon chains in the fatty acid molecule with double bonds at least four, five or six digits are meant.
- Nucleic acids useful in the process are derived from bacteria, fungi, diatoms, animals such as Caenorhabditis or Oncorhynchus or plants such as algae or mosses such as the genera Shewanella, Physcomitrella, Thraustochytrium,
- nucleotide sequences can be used which are suitable for a ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and / or encode ⁇ -3 desaturase and which are linked to a nucleotide sequence as in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 advantageously hybridize under stringent conditions.
- the nucleic acid sequences used in the method are advantageously introduced into an expression cassette which enables expression of the nucleic acids in organisms such as microorganisms or plants.
- nucleic acid sequences which are used for the ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and / or ⁇ -3 Desaturase with one or more regulatory signals advantageously functionally linked to increase gene expression.
- These regulatory sequences are intended to allow the targeted expression of genes and protein expression. Depending on the host plant, this may mean, for example, that the gene is expressed and / or overexpressed only after induction, or that it is expressed and / or overexpressed immediately.
- these regulatory sequences are sequences that bind to the inducers or repressors and thus regulate the expression of the nucleic acid.
- the natural regulation of these sequences may still be present before the actual structural genes and may have been genetically altered so that natural regulation is eliminated and expression of genes increased.
- the gene construct may advantageously also contain one or more so-called enhancer sequences functionally linked to the promoter, which allow increased expression of the nucleic acid sequence. Additional advantageous sequences can also be inserted at the 3 'end of the DNA sequences, such as further regulatory elements or terminators.
- This gene construct or gene constructs can be expressed together in the host plant.
- the gene construct or the gene constructs can be inserted in one or more vectors and be present freely in the cell or else be inserted in the genome. It is advantageous for the insertion of further genes in the host genome if the genes to be expressed are present together in a gene construct.
- the regulatory sequences or factors can, as described above, preferably positively influence the gene expression of the introduced genes and thereby increase them.
- enhancement of the regulatory elements can advantageously be done at the transcriptional level by using strong transcription signals such as promoters and / or enhancers.
- an enhancement of the translation is possible by, for example, the stability of the mRNA is improved.
- a further embodiment of the invention is one or more gene constructs which contain one or more sequences represented by SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 or its derivatives and for polypeptides according to SEQ (D NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQ ID NO: 24 or SEQ ID NO: 26.
- the said ⁇ 6-desaturase, ⁇ 6-elongase -, ⁇ -5-desaturase, ⁇ -5-elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase proteins lead advantageously to a desaturation or elongation of fatty acids, wherein the substrate advantageously has one, two, three, four, five or six double bonds and advantageously 18, 20 or 22 carbon atoms in the fatty acid molecule au
- the substrate advantageously has one, two, three, four, five or six double bonds and advantageously 18, 20 or 22 carbon atoms in the fatty acid molecule au
- Advantageous regulatory sequences which can be used for the preparation of the nucleic acid sequences used in the method according to the invention and their subsequent introduction into plants are, for example, in promoters such as the cos, tac, trp, tet, trp tet, Ipp , lac, lpp-lac, laclq, T7, T5, T3, gal, trc-ara, SP6, ⁇ -PR or ⁇ -PL promoter and are advantageously used in Gram-negative bacteria.
- promoters such as the cos, tac, trp, tet, trp tet, Ipp , lac, lpp-lac, laclq, T7, T5, T3, gal, trc-ara, SP6, ⁇ -PR or ⁇ -PL promoter and are advantageously used in Gram-negative bacteria.
- Further advantageous regulatory sequences are, for example, in the Gram-positive promoters amy and SPO2, in the yeast or fungal promoters ADC1, MFa, AC, P-60, CYC1, GAPDH, TEF, rp28, ADH or in the plant promoters CaMV / 35S [Franck et al., Cell 21 (1980) 285-294], PRP1 [Ward et al., Plant. Biol. 22 (1993)], SSU, OCS, Iib4, usp, STLS1, B33, nos or in the ubiquitin or phaseolin promoter.
- inducible promoters such as those which can be induced in EP-AO 388 186 (benzylsulfonamide-inducible), Plant J. 2, 1992: 397-404 (Gatz et al., Tetracycline-inducible), EP-AO 335 528 (US Pat. Abzisinic inducible) or WO 93/21334 (ethanol or cyclohexenol inducible) promoters.
- suitable plant promoters are the cytosolic FBPase promoter or the potato ST-LSI promoter (Stockhaus et al., EMBO J.
- promoters which allow expression in tissues involved in fatty acid biosynthesis.
- Very specific advantages are seed-specific promoters, such as the USP promoter according to the invention, but also other promoters such as the LeB4, DC3, phaseolin or napin promoter.
- Further particularly advantageous promoters are seed-specific promoters which can be used for monocotyledonous or dicotyledonous plants and in US Pat. No.
- promoters are suitable, for example, for monocotylone lpt-2 or Ipt-1 promoter from barley (WO 95/15389 and WO 95/23230), hordein promoter from barley and other suitable promoters described in WO 99/16890 ,
- the PUFA biosynthesis genes should advantageously be expressed seed-specifically in oilseeds.
- seed-specific promoters can be used, or such promoters that are active in the embryo and / or in the endosperm.
- seed-specific promoters can be isolated from both dicotolydone and monocotolydonous plants.
- Plant gene expression can also be facilitated by a chemically inducible promoter (see review in Gatz 1997, Annu Rev. Plant Physiol Plant Mol. Biol., 48: 89-108).
- Chemically inducible promoters are particularly useful when it is desired that gene expression be in a time-specific manner. Examples of such promoters are a salicylic acid-inducible promoter
- each of the nucleic acids used in the method which is responsible for the ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase can be expressed under the control of its own preferably a different promoter, since repetitive sequence motifs can lead to instability of the T-DNA or to recombination events.
- the expression cassette is advantageously constructed in such a way that a promoter is followed by a suitable interface for insertion of the nucleic acid to be expressed, advantageously followed by a terminator behind the polylinker in a polylinker.
- This sequence is repeated several times, preferably three, four or five times, so that up to five genes can be brought together in one construct and thus introduced into the transgenic plant for expression.
- the sequence is repeated up to three times or, if necessary, several more times.
- the nucleic acid sequences are inserted for expression via the appropriate interface, for example in the polylinker behind the promoter.
- each nucleic acid sequence has its own promoter and optionally its own terminator.
- Such advantageous constructs are disclosed for example in DE 10102337 or DE 10102338.
- nucleic acid sequences behind a promoter and possibly in front of a terminator.
- the insertion site or the sequence of the inserted nucleic acids in the expression cassette is not of decisive importance, that is to say a nucleic acid sequence can be inserted at the first or last position in the cassette, without this significantly influencing the expression.
- different promoters such as the USP, LegB4 or DC3 promoter and different terminators can be used in the expression cassette. But it is also possible to use only one type of promoter in the cassette. However, this can lead to unwanted recombination events.
- transcription of the introduced genes should be advantageously aborted by suitable terminators at the 3 'end of the introduced biosynthetic genes (beyond the stop codon). It can be used here e.g. the OCS1 terminator. As for the promoters, different terminator sequences should be used for each gene.
- the gene construct may, as described above, also include other genes to be introduced into the organisms. It is possible and advantageous to introduce into the host plants regulatory genes, such as genes for inducers, repressors or enzymes, which intervene by their enzyme activity in the regulation of one or more genes of a biosynthetic pathway, and to express therein. These genes may be of heterologous or homologous origin. Furthermore, in the nucleic acid construct or gene construct, further biosynthesis genes of the fatty acid or lipid metabolism, or else these genes may be on one or more other nucleic acid constructs.
- nucleic acids or genes can be cloned in combination with other elongases and desaturases in expression cassettes, such as those mentioned above, and used to transform plants using Agrobacterium.
- the regulatory sequences or factors can, as described above, preferably positively influence the gene expression of the introduced genes and thereby increase them.
- enhancement of the regulatory elements can advantageously be done at the transcriptional level by using strong transcription signals such as promoters and / or enhancers.
- an enhancement of the translation is possible by, for example, the stability of the mRNA is improved.
- the expression cassettes can in principle be used directly for introduction into the plant or else introduced into a vector.
- These advantageous vectors contain the nucleic acids used in the method which are useful for ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ -12 Or a nucleic acid construct which comprises the nucleic acids used alone or in combination with further biosynthesis genes of the fatty acid or lipid metabolism, such as the acyl-CoA: lysophospholipid acyltransferases, ⁇ -4-desaturases, ⁇ -8-desaturases, ⁇ -5-EIongases and / or ⁇ -9-elongases.
- vector refers to a nucleic acid molecule that can transport another nucleic acid to which it is attached.
- plasmid which is a circular double-stranded DNA loop into which additional DNA segments can be ligated.
- viral vector Another type of vector is a viral vector, where additional DNA segments can be ligated into the viral genome.
- Certain vectors may autonomously replicate in a host cell into which they have been introduced (eg bacterial vectors of bacterial origin of replication). Other vectors are advantageously integrated into the genome of a host cell upon introduction into the host cell and thereby replicated together with the host genome.
- certain vectors are capable of expressing genes with which they function. capable of being steered.
- expression vectors suitable for recombinant DNA techniques are in the form of plasmids.
- plasmid and “vector” can be used interchangeably because the plasmid is the most commonly used vector form.
- the invention is intended to encompass these other forms of expression vectors, such as viral vectors that perform similar functions.
- vector is also intended to encompass other vectors known to those skilled in the art, such as phages, viruses such as SV40, CMV, TMV, transposons, IS elements, phasmids, phagemids, cosmids, linear or circular DNA.
- the recombinant expression vectors advantageously used in the method comprise the below-described nucleic acids or the above-described gene construct in a form suitable for expression of the nucleic acids used in a host cell, which means that the recombinant expression vectors comprise one or more regulatory sequences selected on the basis of for expression to be used host cells, which is operably linked to the nucleic acid sequence to be expressed comprises.
- operably linked means that the nucleotide sequence of interest is bound to the regulatory sequence (s) such that expression of the nucleotide sequence is possible and they are linked to each other such that both sequences fulfill the predicted function ascribed to the sequence (eg, in an in vitro transcription / transcription system or in a host cell when the vector is introduced into the host cell).
- regulatory sequence is intended to include promoters, enhancers, and other expression control elements (eg, polyadenylation signals).
- Regulatory sequences include those that direct the constitutive expression of a nucleotide sequence in many host cell types and those that direct the direct expression of the nucleotide sequence only in certain host cells under certain conditions.
- the design of the expression vector may depend on factors such as the selection of the host cell to be transformed, the level of expression of the desired protein, etc.
- the recombinant expression vectors used can be used for the expression of ⁇ -6-desaturases, ⁇ -6-EIongases, ⁇ -5-desaturases, ⁇ -5-elongases, ⁇ -4-desaturases, ⁇ -12-desaturases and / or ⁇ -3 -Desaturases be designed in prokaryotic or eukaryotic cells. This is advantageous because intermediate steps of the vector construction are often carried out in microorganisms for the sake of simplicity.
- the recombinant expression vector may alternatively be transcribed and translated in vitro using, for example, T7 promoter regulatory sequences and T7 polymerase.
- Typical fusion expression vectors include i.a. pGEX (Pharmacia Biotech Inc., Smith, DB, and Johnson, KS (1988) Gene 67: 31-40), pMAL (New England Biolabs, Beverly, MA) and pRIT5 (Pharmacia, Piscataway, NJ), in which glutathione-S Transferase (GST), maltose E-binding protein or protein A is fused to the recombinant target protein.
- GST glutathione-S Transferase
- pTrc amann et al., (1988) Gene 69: 301-315
- pET 11d a coexpressed viral RNA polymerase
- T7 gn1 a coexpressed viral RNA polymerase
- This viral polymerase is provided by the host strains BL21 (DE3) or HMS174 (DE3) from a resident ⁇ prophage harboring a T7 gn1 gene under the transcriptional control of the lacUV 5 promoter.
- vectors in prokaryotic organisms are known to the person skilled in the art, these vectors are, for example, in E. coli pLG338, pACYC184, the pBR series, such as pBR322, the pUC series, such as pUC18 or pUC19, the M113mp series, pKC30, pRep4, pHS1, pHS2, pPLc236, pMBL24, pLG200, pUR290, plN-HI113-B1, ⁇ gt11 or pBdCI, in Streptomyces plJ101, pIJ364, pIJ702 or pIJ361, in Bacillus pUB110, pC194 or pBD214, in Corynebacterium pSA77 or pAJ667.
- the expression vector is a yeast expression vector.
- yeast expression vectors for expression in the yeast S. cerevisiae include pYeDesaturased (Baldari et al. (1987) Embo J. 6: 229-234), pMFa (Kurjan and
- Vectors and methods for constructing vectors suitable for use in other fungi, such as filamentous fungi include those described in detail in: van den Hondel, C.A.M.J.J., & Punt, PJ. (1991) "Gene transfer systems and vector development for filamentous fungi, in: Applied Molecular Genetics of Fungi, JF Peberdy et al., Eds., Pp.
- yeast vectors are, for example, pAG-1, YEp6, YEpI 3 or pEMBLYe23.
- ⁇ -6-desaturase, ⁇ -6 elongase, ⁇ -5-desaturase, ⁇ -5 elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3 desaturase can be used in insect cells using of baculovirus expression vectors.
- Baculovirus vectors available for expression of proteins in cultured insect cells include the pAc series (Smith et al. (1983) Mol. Cell Bio! 3: 2156-2165) and the pVL Series (Lucklow and Summers (1989) Virology 170: 31-39).
- ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase genes are expressed in plant cells or whole plants (eg spermatophytes, such as crops).
- plant expression vectors include those described in detail in: Becker, D., Kemper, E., Schell, J., and Masterson, R. (1992) "New plant binary vectors with selectable markers located proximal to the left Border ", Plant Mol. Biol.
- a plant expression cassette preferably contains regulatory sequences that can control gene expression in plant cells and are functional so that each sequence can fulfill its function, such as termination of transcription, for example, polyadenylation signals.
- Preferred polyadenylation signals are those derived from Agrobacterium tumefaciens T-DNA, such as the gene 3 of the Ti plasmid pTiACH5 known as octopine synthase (Gielen et al., EMBO J. 3 (1984) 835ff.) Or functional equivalents thereof, but also all other terminators functionally active in plants are suitable.
- a plant expression cassette preferably contains other operably linked sequences, such as translation enhancers, e.g., the overdrive sequence containing the 5'-untranslated tobacco mosaic virus leader sequence, which is the protein / RNA ratio increases (Gallie et al., 1987, Nucl. Acids Research 15: 8693-8711).
- translation enhancers e.g., the overdrive sequence containing the 5'-untranslated tobacco mosaic virus leader sequence, which is the protein / RNA ratio increases (Gallie et al., 1987, Nucl. Acids Research 15: 8693-8711).
- Plant gene expression must be operably linked to a suitable promoter that performs gene expression in a timely, cell or tissue-specific manner.
- useful promoters are constitutive promoters (Benfey et al., EMBO J. 8 (1989) 2195-2202), such as those derived from plant viruses, such as 35S CAMV (Franck et al., Cell 21 (1980) 285-294), 19S CaMV (see also US 5352605 and WO 84/02913) or plant promoters, such as the Rubisco small subunit described in US 4,962,028.
- telomeres are preferred sequences necessary to direct the gene product into its corresponding cell compartment (see review in Kermode, Crit., Plant, 15, 4 (1996) 285) -423 and references cited therein), for example, in the vacuole, the nucleus, all kinds of plastids, such as amyloplasts, chloroplasts, chromoplasts, the extracellular space, the
- Mitochondria the endoplasmic reticulum, oil bodies, peroxisomes and other compartments of plant cells.
- Plant gene expression can also be facilitated by a chemically inducible promoter as described above (see review in Gatz 1997, Annu Rev. Plant Physiol Plant Mol. Biol., 48: 89-108).
- Chemically inducible promoters are particularly useful when it is desired that gene expression be in a time-specific manner. Examples of such promoters are a salicylic acid-inducible promoter (WO 95/19443), a tetracycline-inducible promoter (Gatz et al. (1992) Plant J. 2, 397-404) and an ethanol-inducible promoter.
- Promoters which react to biotic or abiotic stress conditions are also suitable promoters, for example the pathogen-induced PRP 1 gene promoter (Ward et al., Plant Mol. Biol. 22 (1993) 361-366), the heat-inducible hsp ⁇ O promoter from tomato (US Pat. No. 5,187,267), the potato-alpha-amylase-inducible promoter (WO 96/12814) or the wound-inducible pinII promoter (EP-A-0 375 091).
- those promoters which induce gene expression in tissues and organs in which the fatty acid, lipid and oil biosynthesis take place are preferred in sperm cells such as the cells of the endosperm and the developing embryo.
- Suitable promoters are the rapeseed napin promoter (US Pat. No. 5,608,152), the Vicia faba USP promoter (Baeumlein et al., Mol Gen Genet.
- promoters which induce seed-specific expression in monocotyledonous plants such as maize, barley, wheat, rye, rice, and the like.
- Suitable noteworthy promoters are the lpt2 or Ipt1 gene promoter from barley (WO 95/15389 and WO 95/23230) or those described in WO 99/16890 (promoters from the barley hordein gene, the rice glutelin gene , the rice oryzin gene, the rice prolamin gene, the wheat gliadin gene, the wheat glutelin gene, the maize zein gene, the oat glutelin gene, the sorghum kasirin gene, the rye secalin gene).
- multiparallel expression of the ⁇ -6-desaturase, ⁇ -6 elongase, ⁇ -5-desaturase, ⁇ -5 elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3 used in the method can be used Desaturase be desired.
- the introduction of such expression cassettes can be carried out via a simultaneous transformation of a plurality of individual expression constructs or preferably by combining a plurality of expression cassettes on a construct. It is also possible to transform a plurality of vectors each having a plurality of expression cassettes and to transfer them to the host cell.
- promoters which induce plastid-specific expression are particularly suitable.
- Suitable promoters such as the viral RNA polymerase promoter, are described in WO 95/16783 and WO 97/06250, and the Arabidopsis clpP promoter described in WO 99/46394.
- Vector DNA can be introduced into prokaryotic or eukaryotic cells via conventional transformation or transfection techniques.
- transformation and “transfection”, conjugation and transduction are intended to encompass a variety of methods known in the art for introducing foreign nucleic acid (eg DNA) into a host cell, including calcium phosphate or calcium chloride coprecipitation, DEAE- Dextran-mediated transfection, lipofection, natural competence, chemically mediated transfer, electroporation or particle bombardment.
- Suitable methods for transforming or transfecting host cells, including plant cells can be found in Sambrook et al. (Molecular Cloning: A Laboratory Manual, 2nd ed., CoId Spring Harbor Laboratory, Col. Spring Harbor Laboratory Press, Col. Spring Harbor, NY, 1989) and others Laboratory Manuals, such as Methods in Molecular Biology, 1995, Vol. 44, Agrobacterium protocols, Eds: Gartland and Davey, Humana Press, Totowa, New Jersey.
- Host cells which are suitable in principle for receiving the nucleic acid according to the invention, the gene product according to the invention or the vector according to the invention are all prokaryotic or eukaryotic organisms.
- the host organisms which are advantageously used as intermediate hosts are microorganisms, such as fungi or yeasts.
- Preferred in the process according to the invention are plants such as oil crop plants which contain large amounts of lipid compounds, such as oilseed rape, evening primrose, hemp, Diestel, peanut, canola, linseed, soybean, safflower, sunflower, borage, or plants such as maize, wheat, rye, Oats, triticale, rice, barley, cotton,
- Cassava, pepper, tagetes, solanaceae plants such as potato, tobacco, eggplant and tomato, vicia species, pea, alfalfa, bush plants (coffee, cocoa, tea), salix species, trees (oil plan, coconut) and forage crops.
- Particularly preferred plants according to the invention are oil crop plants, such as soybean, peanut, rapeseed, canola, flax, hemp, evening primrose, sunflower, safflower, trees (oil palm, coconut).
- nucleic acid sequences enumerated below which code for ⁇ -6-desaturases, ⁇ -6-elongases, ⁇ -5-desaturases, ⁇ -3-desaturases and / or ⁇ -12-desaturases.
- Isolated nucleic acid sequences encoding polypeptides having ⁇ -6 desaturase activity selected from the group consisting of: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 1, b) nucleic acid sequences encoding a protein having the amino acid sequence shown in SEQ ID NO: 2 or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 1, which code for polypeptides with at least 70% identity at the amino acid level with SEQ ID NO: 2 and have a ⁇ -6-desaturase activity.
- Isolated nucleic acid sequences encoding polypeptides having ⁇ 6-elongase activity selected from the group consisting of: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 3, SEQ ID NO: 5 or SEQ ID NO: 7, b) nucleic acid sequences, which code for a protein having the sequence shown in SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8, or c) derivatives of SEQ ID NO: 3, SEQ ID NO: 5 or SEQ ID NO: 7, which code for polypeptides with at least 70% identity at the amino acid level with SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8 and have a ⁇ 6-elongase activity.
- Isolated nucleic acid sequences encoding polypeptides having ⁇ 5-desaturase activity selected from the group consisting of: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 9, b) nucleic acid sequences encoding a protein having the amino acid sequence shown in SEQ ID NO: 10 or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 9, which code for polypeptides having at least 40% identity at the amino acid level with SEQ ID NO: 10 and have a ⁇ -5-desaturase activity.
- Isolated nucleic acid sequences encoding polypeptides having ⁇ -3 desaturase activity selected from the group consisting of: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 23, b) nucleic acid sequences encoding a protein having the amino acid sequence shown in SEQ ID NO: 24 or c) derivatives of the nucleic acid sequence shown in SEQ ID NO: 23, which code for polypeptides having at least 40% identity at the amino acid level with SEQ ID NO: 24 and have an ⁇ -3-desaturase activity.
- Isolated nucleic acid sequences which code for polypeptides having ⁇ 12-desaturase activity, selected from the group consisting of: a) a nucleic acid sequence having the sequence shown in SEQ ID NO: 25, or b) nucleic acid sequences encoding a protein having the amino acid sequence shown in SEQ ID NO: Or c) derivatives of the nucleic acid sequence set forth in SEQ ID NO: 25 that encode polypeptides having at least 40% identity at the amino acid level with SEQ ID NO: 26 and have ⁇ -12 desaturase activity.
- nucleic acids according to the invention are derived from organisms such as fungi, plants such as algae or diatoms which can synthesize PUFAs.
- nucleic acid sequences are advantageously derived from the diatome genus Thalassiosira or from the family Prasinophyceae such as the genus Ostreococcus, from the class of Euglenophyceae such as the genus Euglenia or Pythiaceae such as the genus Phytophtora.
- nucleic acid sequences are of the genus and species Phytophtora sojae. These nucleic acid sequences enable in an advantageous Embodiment the synthesis of EPA and / or ARA.
- the following table represents such advantageous nucleic acid sequences.
- the subject of the invention also includes, as described above, isolated nucleic acid sequence useful for polypeptides having ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ -3-desaturase and ⁇ 12- Encode desaturase activity, wherein the encoded by these nucleic acid sequences ⁇ -6-desaturases, ⁇ -6-elongases, ⁇ -5-desaturases, ⁇ -3-desaturases and / or ⁇ -12-desaturases C 18 - or C 2 o fatty acids with one, two, three or four double bonds such as C18: 1 ⁇ 9 , C18: 2 ⁇ 9 12 or C18: 3 ⁇ 9 ' 12 ' 15 polyunsaturated C 2 o fatty acids with three or four double bonds such as
- nucleic acid (molecule) also comprises, in an advantageous embodiment, the untranslated sequence located at the 3 'and 5' end of the coding gene region: at least 500, preferably 200, more preferably 100 nucleotides of the sequence upstream of the 5 'end of the coding region and at least 100, preferably 50, more preferably 20 nucleotides of the sequence downstream of the 3' end of the coding gene region.
- An "isolated" nucleic acid molecule is separated from other nucleic acid molecules present in the natural source of the nucleic acid.
- nucleic acid preferably does not have sequences that naturally flank the nucleic acid in the genomic DNA of the organism from which the nucleic acid is derived (eg, sequences located at the 5 'and 3' ends of the nucleic acid).
- the isolated ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 3-desaturase, and ⁇ 12-desaturase molecules may be less than about 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb or 0.1 kb to nucleotide sequences that naturally flank the nucleic acid molecule in the genomic DNA of the cell from which the nucleic acid is derived.
- nucleic acid molecules used in the method for example a nucleic acid molecule having a nucleotide sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 or a part thereof can be isolated using standard molecular biology techniques and the sequence information provided herein. For example, comparative algorithms can be used to identify a homologous sequence or homologous, conserved sequence regions at the DNA or amino acid level.
- a nucleic acid molecule comprising a complete sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 or a part thereof, by polymerase chain reaction, wherein Oligonucleotide primers used on the basis of this sequence or parts thereof (eg a nucleic acid molecule comprising the complete sequence or a part thereof can be isolated by polymerase chain reaction using oligonucleotide primers prepared on the basis of this same sequence) ,
- mRNA can be isolated from cells (eg, by the guanidinium thiocyanate extraction method of Chirgwin et al.
- Synthetic oligonucleotide primers for polymerase chain reaction amplification can be prepared on the basis of one of the sequences shown in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 or using the sequences shown in SEQ ID NO 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ ID NO: 16, SEQ ID NO: 18 , SEQ ID NO: 20, SEQ ID NO: 22, SEQ ID NO: 24 or SEQ ID NO: 26 create amino acid sequences shown.
- a nucleic acid of the invention may be amplified using cDNA or alternatively genomic DNA as a template and suitable oligonucleotide primers according to standard PCR amplification techniques.
- the thus amplified nucleic acid can be cloned into a suitable vector and characterized by DNA sequence analysis.
- Oligonucleotides corresponding to a desaturase nucleotide sequence can be prepared by standard synthetic methods, for example, with an automated DNA synthesizer.
- Nucleic acid sequences having the sequence SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 means, for example, allelic variants with at least about 40 or 50%, preferably at least about 60 or 70%, more preferably at least about 70 or 80%, 90% or 95%, and even more preferably at least about 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92 %, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identity or homology to one of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ
- nucleic acid molecules of a nucleotide sequence which correspond to one of the amino acid sequences shown in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 hybridizing nucleotide sequences or a part thereof, eg under stringent Conditions hybridized.
- allelic variants include functional variants which are obtained by deletion, insertion or substitution of nucleotides from / in which is shown in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 Sequence obtained, but the intention is that the enzyme activity of the resulting synthesized proteins for the insertion of one or more genes is advantageously maintained. Proteins which still retain the enzymatic activity of ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ -5
- Elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase possess, that is, whose activity is substantially not reduced, means proteins with at least 10%, preferably 20%, more preferably 30%, completely more preferably 40% of the original enzyme activity compared to that represented by SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 encoded protein. Homology was calculated over the entire amino acid or nucleic acid sequence range.
- SEQ ID NO: 1 SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ [D NO: 11, SEQ ID NO: 13, SEQ ID NO: 15
- SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 also mean bacterial, fungal and plant homologs, truncated sequences, single-stranded DNA or RNA of the coding and non-coding DNA sequence.
- Homologues of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 also means derivatives such as promoter variants.
- the promoters upstream of the indicated nucleotide sequences may be modified by one or more nucleotide exchanges, insertions, and / or deletions, without, however, interfering with the functionality or activity of the promoters. It is also possible that the activity of the promoters is increased by modification of their sequence or that they are completely replaced by more active promoters, even from heterologous organisms.
- the lipid synthesis can be divided into two sections: the synthesis of fatty acids and their attachment to sn-glycerol-3-phosphate and the addition or modification of a polar head group.
- Common lipids used in membranes include phospholipids, glycolipids, sphingolipids and phosphoglycerides.
- Fatty acid synthesis begins with the conversion of acetyl-CoA into malonyl-CoA by the acetyl-CoA carboxylase or into acetyl-ACP by the acetyl transacylase.
- these enzymes can transfer the elongated fatty acids again from the CoA esters to the phospholipids. This reaction sequence can optionally be run through several times.
- Precursors for the PUFA biosynthesis are, for example, oleic acid, linoleic acid and linolenic acid. These C18-carbon fatty acids must on C 20 and C 22 are extended, to obtain fatty acids of the eicosa and docosa chain type.
- Arachidonic acid, eicosapentaenoic acid and / or docosahexaenoic acid, advantageously eicosapentaenoic acid and / or docosahexaenoic acid can be produced by means of the desaturases and / or elongases used in the process and subsequently used for various purposes in food, feed, cosmetic or pharmaceutical applications.
- C 20 - and / or C 22 -fatty acids having at least two, advantageously at least four, five or six double bonds in the fatty acid molecule, preferably C 20 - or C 8 -fatty acids with advantageously five or six double bonds in the fatty acid molecule can be prepared with the abovementioned enzymes.
- Substrates of the desaturases and elongases used in the process according to the invention are C 16 , C 18 or C 20 fatty acids, for example linoleic acid, ⁇ -1-linolenic acid, ⁇ -linolenic acid, dihomo- ⁇ -linolenic acid, eicosatetraenoic acid or stearidonic acid.
- Preferred substrates are linoleic acid, ⁇ -linolenic acid and / or ⁇ -linolenic acid, dihomo- ⁇ -iinolenic acid or arachidonic acid, eicosatetraenoic acid or eicosapentaenoic acid.
- the synthesized C 20 - or C 22 -fatty acids having at least four, five or six double bonds in the fatty acid are advantageously added to their triglycerides in the novel process in the form of the free fatty acid or in the form of their esters, for example in the form of their glycerides.
- glycolide is understood to mean a glycerol esterified with one, two or three carboxylic acid residues (mono-, di- or triglyceride).
- glycolide is also meant a mixture of different glycerides.
- the glyceride or glyceride mixture may contain other additives, e.g. contain free fatty acids, antioxidants, proteins, carbohydrates, vitamins and / or other substances.
- a "glyceride” in the sense of the method according to the invention is also understood to mean derivatives derived from glycerol.
- these also include glycerophospholipids and glyceroglycolipids.
- the glycerophospholipids such as lecithin (phosphatidylcholine), cardiolipin, phosphatidylglycerol, phosphatidylserine and alkylacylglycerophospholipids, may be mentioned by way of example here.
- fatty acids must then be transported to various modification sites and incorporated into the triacylglycerol storage lipid.
- Another important step in lipid synthesis is the transfer of fatty acids to the polar head groups, for example, by glycerol-fatty acid acyltransferase (see Frentzen, 1998, Lipid, 100 (4-5): 161-166).
- the PUFAs produced in the process comprise a group of molecules that are no longer able to synthesize, and therefore need to take up, higher animals, or that can no longer sufficiently produce higher animals themselves, and thus have to additionally take up, even though they are readily synthesized by other organisms, such as bacteria For example, cats can no longer synthesize arachidonic acid.
- phospholipids are to be understood as meaning phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylglycerol and / or phosphatidylinositol, advantageously phosphatidylcholine.
- production or productivity are known in the art and include productivity within a plant cell or plant, that is, the content of the desired fatty acids produced in the process based on the content of all fatty acids in that cell or plant.
- biosynthesis or biosynthetic pathway are known in the art and involve the synthesis of a compound, preferably an organic compound, by a cell from intermediates, for example in a multi-step and highly regulated process.
- degradation or degradation pathway are known in the art and involve the cleavage of a compound, preferably an organic compound, by a cell into degradation products (more generally, smaller or less complex molecules), for example in a multi-step and highly regulated process.
- metabolism is known in the art and includes the entirety of the biochemical reactions that take place in an organism. The metabolism of a particular compound (e.g., the metabolism of a fatty acid) then comprises all of the biosynthetic, modification, and degradation pathways of that compound in the cell that affect that compound.
- derivatives of the nucleic acid molecule of the invention encode again in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 23 or SEQ ID NO: 25 proteins having at least 40%, preferably about 50 or 60%, preferably at least about 60 or 70%, and more preferably at least about 70 or 80%, 80 to 90%, 90 to 95%, and most preferably at least about 96% , 97%, 98%, 99% or more homology (homology within the meaning of the invention is intended to mean identity) to a complete amino acid sequence of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8 , SEQ ID NO: 10, SEQ ID NO: 24 or SEQ ID NO: 26.
- the invention also encompasses nucleic acid molecules which differ from one of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 23 or SEQ ID NO: 25 nucleotide sequences (and parts thereof) differ due to the degenerate genetic code and thus the same ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ -3-desaturase or ⁇ - 12-desaturase activity encode such as those of the in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 23 or SEQ ID NO : 25 nucleotide sequences shown is encoded.
- Desaturase and / or ⁇ -12-desaturase gene are the result of natural variation and which do not alter the functional activity of, are intended to be included within the scope of the invention.
- Nucleic acid molecules which are advantageous for the process according to the invention can be prepared on the basis of their homology to the ⁇ 6-desaturase, ⁇ 6 -enongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase , ⁇ -12-desaturase and / or ⁇ -3-desaturase nucleic acids using the sequences or a portion thereof as a hybridization probe according to standard hybridization techniques under stringent hybridization conditions.
- isolated nucleic acid molecules can be used which are at least 15 nucleotides long and under stringent conditions with the nucleic acid molecules having a nucleotide sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 include hybridizing.
- Nucleic acids may also be used at least 25, 50, 100, 250 or more nucleotides are used.
- hybridized under stringent conditions is intended to describe hybridization and washing conditions under which nucleotide sequences that are at least 60% homologous to one another usually remain hybridized to one another.
- the conditions are preferably such that sequences that are at least about 65%, more preferably at least about 70%, and even more preferably at least about 75% or more homologous, are usually hybridized to each other.
- stringent conditions are known to those skilled in the art and can be found in Current Protocols in Molecular Biology, John Wiley & Sons, NY (1989), 6.3.1-6.3.6.
- a preferred, non-limiting example of stringent hybridization conditions are hybridizations in 6x sodium chloride / sodium citrate (SSC) at about 45 ° C, followed by one or more washes in 0.2x SSC, 0.1%. SDS at 50 to 65 ° C. It is known to those skilled in the art that these hybridization conditions differ with respect to the type of nucleic acid and, for example, when organic solvents are present, with respect to the temperature and the concentration of the buffer. The temperature differs, for example under "standard hybridization conditions" depending on the type of nucleic acid between 42 ° C and 58 ° C in aqueous buffer with a concentration of 0.1 to 5 x SSC (pH 7.2).
- the temperature is about 42 ° C under standard conditions.
- the hybridization conditions for DNA: DNA hybrids are, for example, 0.1 x SSC and 20 0 C to 45 ° C, preferably between 30 ° C and 45 ° C.
- the hybridization conditions for DNA: RNA hybrids are, for example, 0.1 x SSC and 30 0 C to 55 ° C, preferably between 45 ° C and 55 ° C.
- sequences are written one below the other for the purpose of optimal comparison (eg, gaps may be inserted into the sequence of a protein or nucleic acid to create an optimal alignment with the other protein or nucleic acid).
- amino acid residues or nucleotides at the corresponding amino acid positions or nucleotide positions are then compared. If a position in one sequence is occupied by the same amino acid residue or nucleotide as the corresponding site in the other sequence, then the molecules are homologous at that position (ie, amino acid or nucleic acid 'homology' as used herein). corresponds to amino acid or nucleic acid "identity".)
- the terms homology and identity are thus to be regarded as synonymous
- the programs or algorithms used are described above.
- An isolated nucleic acid molecule encoding a ⁇ 6-desaturase, ⁇ 6-Elo ⁇ gase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and / or ⁇ -3-desaturase which corresponds to a protein sequence of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQ ID NO: 24 or SEQ ID NO: 26 may be obtained by introducing one or more nucleotide substitutions, additions or deletions into a nucleotide sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17,
- Mutations can be converted into one of the sequences of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23 or SEQ ID NO: 25 are introduced by standard techniques such as site-directed mutagenesis and PCR-mediated mutagenesis.
- conservative amino acid substitutions are made on one or more of the predicted nonessential amino acid residues.
- the amino acid residue is replaced with an amino acid residue having a similar side chain.
- families of amino acid residues have been defined with similar side chains.
- amino acids with basic side chains eg, lysine, arginine, histidine
- acidic side chains eg, aspartic acid, glutamic acid
- uncharged polar side chains eg, glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine
- nonpolar side chains eg Alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan
- beta-branched side chains eg, threonine, valine, isoleucine
- aromatic side chains eg, tyrosine, phenylalanine, tryptophan, histidine
- a predicted nonessential amino acid residue in a ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ -4-desaturase, ⁇ 12-desaturase or ⁇ -3-desaturase thus becomes preferably replaced by another amino acid residue from the same side chain family.
- the mutations may be randomized over all or part of the ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12- Desaturase or ⁇ -3-desaturase coding sequence, for example by saturation mutagenesis, and the resulting mutants can be synthesized according to the here described ⁇ 6-desaturase, ⁇ 6-elongase, ⁇ 5-desaturase, ⁇ - 5-elongase, ⁇ -4-desaturase, ⁇ -12-desaturase and / or ⁇ -3-desaturase activity to identify mutants containing the ⁇ -6-desaturase, ⁇ -6 elongase , ⁇ 5-desaturase, ⁇ 5-elongase, ⁇ 4-desaturase, ⁇ 12-desaturase and / or ⁇ -3-desaturase activity to identify mutants
- the encoded protein can be recombinantly expressed, and the activity of the protein can be determined, for example, using of the tests described herein.
- transgenic non-human organism advantageously a transgenic plant, which comprises the nucleic acids according to the invention SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 23 or SEQ ID NO: 25 or a gene construct or a vector containing these nucleic acid sequences according to the invention.
- the cloning methods e.g. Restriction cleavage, agarose gel electrophoresis, purification of DNA fragments, transfer of nucleic acids to nitrocellulose and nylon membranes, linkage of DNA fragments, transformation of Escherichia coli cells, culture of bacteria and sequence analysis of recombinant DNA were performed as described in Sambrook et al. (1989) (CoId Spring Harbor Laboratory Press: ISBN 0-87969-309-6).
- RNA of Phytophthora sojae was isolated using the RNAeasy kit from Qiagen (Valencia, CA, US). From the total RNA, poly-A + RNA (mRNA) was isolated using oligo-dT-cellulose (Sambrook et al., 1989). The RNA was reverse-transcribed with Promega's Reverse Transcription System Kit and the synthesized cDNA cloned into the lambda ZAP vector (lambda ZAP Gold, Stratagene). According to the manufacturer's instructions, the cDNA was decompressed to the plasmid DNA.
- mRNA poly-A + RNA
- the plasmid library was then screened for the corresponding putative candidate genes (hybridization of bacterial clones, Sambrook et al., 1989) and positive clones were sequenced. The corresponding cDNA clones were then used for the PCR for the cloning of expression plasmids.
- the corresponding sequences are amplified by PCR using appropriate specific primers and cloned into the yeast expression vector pYES2.1 -TOPO (Invitrogen) according to the manufacturer's instructions. Only the open reading frames of the genes coding for the PUFA proteins are amplified. In addition, a Kozak sequence (Cell 1986, 44: 283-292) is attached to the 5 ':
- Annealing temperature 1 min 55 ° C denaturation temperature: 1 min 94 0 C elongation temperature: 2 min 72 0 C number of cycles: 35
- PCR products are incubated according to the manufacturer's instructions with the plasmid pYES2.1-TOPO (Invitrogen). The incubation reactions are then transformed into E. coli DH5 ⁇ cells (Invitrogen) according to the manufacturer's instructions. Positive clones are identified by PCR (see reaction above) and the plasmid DNA isolated (Qiagen Dneasy). The resulting plasmids are checked by sequencing and transformed into the Saccharomyces strain INVSd (Invitrogen) by electroporation (1500 V). As a control, pYES2.1 (empty vector) is transformed in parallel. The selection of the transfor- Yeasts are plated on complete minimal medium (CMdum) agar plates with 2% glucose but without uracil. After selection, three transformants each are selected for further functional expression.
- Cmum complete minimal medium
- CMdum liquid medium with 2% (w / v) raffinose but without uracil precultures from each 5 ml of CMdum liquid medium with 2% (w / v) raffinose but without uracil are inoculated with the selected transformants and incubated for 2 days at 30 0 C, 200 rpm.
- 5 ml of CMdum liquid medium (without uracif) with 2% raffinose and 300 ⁇ M of different fatty acids are then inoculated with the precultures to an OD 60O of 0.05.
- Expression is induced by the addition of 2% (w / v) galactose.
- the cultures are incubated for a further 96 h at 20 ° C.
- Annealing temperature 1 min 55 0 C denaturation temperature: 1 min 94 0 C elongation temperature: 2 min 72 0 C number of cycles: 35
- the PCR products are incubated for 4 h at 37 0 C with the Restriktio ⁇ senzym Notl.
- the plant expression vector pSUN300-USP is incubated in the same way.
- the PCR products and the 7624 bp vector are separated by agarose gel electrophoresis and the corresponding DNA fragments are excised.
- the DNA is purified by Qiagen gel purification kit according to the manufacturer's instructions.
- vector and PCR products are ligated. To do this, Roche's Rapid Ligation Kit is used. The resulting plasmids are verified by sequencing.
- pSUN300 is a derivative of the plasmid pPZP (Hajdukiewicz P, Svab, Z, Maliga, P., (1994) The small versatile pPZP family of Agrobacterium binary vectors for plant transformation, Plant Mol Biol 25: 989-994).
- pSUN-USP was generated from pSUN300 by inserting into pSUN300 a USP promoter as an EcoRI fragment.
- the polyadenylation signal is that of the OCS gene from the A.
- tumefaciens Ti plasmid (ocs terminator, Genbank Accession V00088) (De Greve.H., Dhaese.P., Seurinck, J., Lemmers.M., Van Montagu M. and Schell, J. Nucleotide sequence and transcript map of the Agrobacterium tumefaciens Ti plasmid-encoded octopine synthase gene J. Mol.
- the USP promoter corresponds nucleotides 1 to 684 (Genbank Accession X56240), wherein part of the non-coding region of the USP gene is contained in the promoter
- the 684 base pair promoter fragment was amplified by means of commercially available T7 standard primer (Stratagene) and with the aid of a synthesized primer. Reaction amplified by standard methods (primer sequence: 5'-
- the PCR fragment was rescored with EcoRI / SalI and inserted into the vector pSUN300 with OCS terminator.
- the result was the plasmid with the name pSUN-USP, which can be used for the plant transformation by means of Agrobacterium tumefaciens.
- the yeast cells from the main cultures are (100 ⁇ g, 5 min, 20 0 C) harvested by centrifugation and washed with 100 mM NaHCO 3, pH 8.0 to remove residual medium and fatty acids to be removed.
- fatty acid methyl esters (FAMEs) are produced by acid methanolysis.
- the cell sediments are incubated with 2 ml of 1N methanolic sulfuric acid and 2% (v / v) dimethoxypropane for 1 h at 80 ° C.
- the extraction of the FAMEs is carried out by extraction twice with petroleum ether (PE).
- the organic phases are each determined once with 2 ml of 100 mM NaHCO 3 , pH 8.0 and 2 ml of distilled water. washed. Subsequently, the PE phases are dried with Na 2 SO 4 , evaporated under argon and taken up in 100 ⁇ l of PE. Samples are placed on a DB-23 capillary column (30 m, 0.25 mm, 0.25 ⁇ m, Agilent) in a Hewlett-Packard 6850 Gas chromatograph with flame ionization detector disconnected.
- the conditions for the GLC analysis are as follows: The oven temperature was programmed from 50 finally 0 C to 250 0 C at a rate of 5 ° C / min and 10 min at 250 ° C (hold). The signals are identified by comparison of the retention times with corresponding fatty acid standards (Sigma). The methodology is described for
- the activity and substrate specificity of the individual genes can be determined after expression and feeding of various fatty acids.
- the fed substrates are present in large quantities in all transgenic yeasts, demonstrating the uptake of these fatty acids into the yeasts.
- the transgenic yeasts show the synthesis of new fatty acids, the products of genes. This means that the genes from Phytophtora sojae can be functionally expressed.
- the substrate specificity of desaturases and elongases can be determined after expression in yeast by feeding using various yeasts. Descriptions for the determination of the individual activities can be found in WO 93/11245 for o3-desaturases, WO 94/11516 for ⁇ 12-desaturases, WO 93/06712, US 5,614,393,
- the activity of the individual desaturases and elongases is calculated from the conversion rate according to the formula [substrate / (substrate + product) * 100].
- Example 8 Generation of Transgenic Plants a) Generation of Transgenic Oilseed Rape Plants (Altered According to Moloney et al., 1992, Plant Cell Reports, 8: 238-242) For generating transgenic rape plants, binary vectors such as those described in US Pat
- Example 5 pSUN plasmids generated with genes from Phytophtora sojae transformed into Agrobacterium tumefaciens C58C1: pGV2260 (Deblaere et al, 1984, Nucl. Acids. Res. 13, 4777-4788).
- oilseed rape plants Var Drakkar, NPZ Nor- wegische Maizucht, Hohenlieth, Germany
- Petioles or hypocotyledons of freshly germinated sterile rape plants were incubated in a Petri dish with a 1:50 agrobacterial dilution for 5-10 minutes. This is followed by a 3-day co-incubation in darkness at 25 ° C on 3MS medium with 0.8% Bacto agar. Cultivation was continued after 3 days at 16 hours light / 8 hours darkness and at weekly intervals on MS medium containing 500 mg / L claforan (Cefotaxime sodium), 50 mg / L kanamycin, 20 microM benzylaminopurine (BAP) and 1, 6 g / l glucose continued.
- MS medium containing 500 mg / L claforan (Cefotaxime sodium), 50 mg / L kanamycin, 20 microM benzylaminopurine (BAP) and 1, 6 g / l glucose continued.
- Regenerated shoots were obtained on 2MS medium with kanamycin and claforan, transferred into soil after rooting and grown in a climatic chamber or greenhouse after cultivation for two weeks, flowered, harvested mature seeds, and expression of the desaturase and elongase genes, respectively investigated by lipid analysis as exemplified in Qiu et al. 2001, J. Biol. Chem. 276, 31561-31566. b) Production of transgenic flax plants
- transgenic flax plants can be carried out, for example, according to the method of Bell et al., 1999, In Vitro Cell. Dev. Biol. Plant. 35 (6): 456-465 by means of particle bombartment.
- Agrobacteria-mediated transformations can be carried out, for example, according to Mlynarova et al. (1994), Plant Cell Report 13: 282-285
- the effect of genetic modification in plants, fungi, algae, ciliates or on the production of a desired compound may be determined by cultivating the modified microorganism or modified plant under suitable conditions (such as those described above), and Medium and / or the cellular components on the increased production of the desired product (ie of lipids or a fatty acid) is examined.
- suitable conditions such as those described above
- These analytical techniques are well known to those skilled in the art and include spectroscopy, thin layer chromatography, staining methods of various types, enzymatic and microbiological methods, and analytical chromatography such as high performance liquid chromatography (see, for example, Ullman, Encyclopedia of Industrial Chemistry, Vol. A2, pp. 89-90 and p.
- Analytical techniques include measurements of nutrient levels in the medium (e.g., sugars, hydrocarbons, nitrogen sources, phosphate and other ions), measurements of biomass composition and growth, analysis of production of common biosynthetic pathway metabolites, and measurements of gases produced during fermentation. Standard methods for these measurements are in Applied Microbial Physiology; A Practical Approach, P.M. Rhodes and P.F. Stanbury, eds., IRL Press, pp.
- fatty acids abbreviations: FAME, fatty acid methyl ester, GC-MS, gas-liquid chromatography-mass spectrometry, TAG, triacylglycerol, TLC, thin-layer chromatography.
- the material to be analyzed may be broken up by sonication, milling in the glass mill, liquid nitrogen and milling or other applicable methods.
- the material must be centrifuged after rupture.
- the sediment is distilled in aqua. re-suspended, heated at 100 ° C. for 10 minutes, cooled on ice and recentrifuged, followed by extraction into 0.5 M sulfuric acid in methanol with 2% dimethoxypropane for 1 hour at 90 ° C., resulting in hydrolyzed oil and lipid compounds, which give transmethylated lipids.
- fatty acid methyl esters are extracted in petroleum ether and finally subjected to GC analysis using a capillary column (Chrompack, WCOT fused silica, CP-Wax-52 CB, 25 microm, 0.32 mm) at a temperature gradient between 170 0 C and 240 0 C for 20 min and 5 min at 240 0 C subjected.
- Chropack, WCOT fused silica, CP-Wax-52 CB, 25 microm, 0.32 mm a temperature gradient between 170 0 C and 240 0 C for 20 min and 5 min at 240 0 C subjected.
- the identity of the resulting fatty acid methyl esters must be defined using standards available from commercial sources (ie Sigma).
- Plant material is first mechanically homogenized by mortars to make it more accessible to extraction.
- the mixture is then heated for 10 min at 100 0 C and sedimented again after cooling on ice.
- the cell sediment is hydrolyzed with 1 M methanolic sulfuric acid and 2% Dimetho- xypropan 1 h at 90 0 C and the lipids are transmethylated.
- the resulting fatty acid methyl esters (FAME) are extracted into petroleum ether.
- the extracted FAMEs are (m Chrompack, WCOT Fused Silica, CP-Wax-52 CB, 25, 0.32 mm) by gas-liquid chromatography with a capillary column and a temperature gradient of 170 0 C to 240 ° C in 20 minutes and 5 minutes at 240 0 C analyzed.
- the identity of the fatty acid methyl esters is confirmed by comparison with corresponding FAME standards (Sigma).
- the identity and position of the double bond can be further analyzed by GC-MS by suitable chemical derivatization of the FAME mixtures, eg to 4,4-dimethoxyoxazoline derivatives (Christie, 1998).
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ES06725200.7T ES2635013T3 (es) | 2005-03-22 | 2006-03-21 | Procedimiento para la preparación de ácidos grasos poliinsaturados de C20 y C22 con al menos cuatro enlaces dobles en plantas transgénicas |
CA2600286A CA2600286C (en) | 2005-03-22 | 2006-03-21 | Method for producing polyunsaturated c20 and c22 fatty acids with at least four double bonds in transgenic plants |
EP06725200.7A EP1866417B1 (de) | 2005-03-22 | 2006-03-21 | Verfahren zur herstellung von mehrfach ungesättigten c20- und c22-fettsäuren mit mindestens vier doppelbindungen in transgenen pflanzen |
US11/886,857 US8049064B2 (en) | 2005-03-22 | 2006-03-21 | Method for producing polyunsaturated C20- and C22-fatty acids with at least four double bonds in transgenic plants |
AU2006226338A AU2006226338B9 (en) | 2005-03-22 | 2006-03-21 | Method for producing polyunsaturated C20 and C22 fatty acids with at least four double bonds in transgenic plants |
DK06725200.7T DK1866417T3 (en) | 2005-03-22 | 2006-03-21 | PROCEDURE FOR MANUFACTURING MULTI-Saturated C20 AND C22 FAT ACIDS WITH AT LEAST FOUR DOUBLE BINDINGS IN TRANSGENIC PLANTS |
NO20074434A NO20074434L (no) | 2005-03-22 | 2007-09-03 | Fremgangsmate for fremstilling av polyumettede C20 og C22 fettsyrer med minst fire dobbeltbindinger i transgene planter |
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