WO2000008185A1 - Nukleinsäuremoleküle kodierend für beta-amylase, pflanzen, die eine modifizierte stärke synthetisieren, herstellungsverfahren und verwendungen - Google Patents
Nukleinsäuremoleküle kodierend für beta-amylase, pflanzen, die eine modifizierte stärke synthetisieren, herstellungsverfahren und verwendungen Download PDFInfo
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- WO2000008185A1 WO2000008185A1 PCT/EP1999/005523 EP9905523W WO0008185A1 WO 2000008185 A1 WO2000008185 A1 WO 2000008185A1 EP 9905523 W EP9905523 W EP 9905523W WO 0008185 A1 WO0008185 A1 WO 0008185A1
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
- C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
- C12N9/2405—Glucanases
- C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
- C12N9/2411—Amylases
- C12N9/2425—Beta-amylase (3.2.1.2)
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- 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
- C12N15/8245—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 carbohydrate or sugar alcohol metabolism, e.g. starch biosynthesis
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1048—Glycosyltransferases (2.4)
- C12N9/1051—Hexosyltransferases (2.4.1)
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
- C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
- C12N9/2405—Glucanases
- C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
Definitions
- the present invention relates to nucleic acid molecules which encode a protein with the activity of a ⁇ -amylase from potatoes and to processes for producing transgenic plant cells and plants which synthesize a modified starch. Furthermore, the present invention relates to vectors and host cells which contain the nucleic acid molecules according to the invention, the plant cells and plants resulting from the processes according to the invention, the starch synthesized by the plant cells and plants according to the invention and processes for producing this starch.
- polysaccha de are important, renewable raw materials from plants.
- starch which is one of the most important storage substances in higher plants.
- the potato plays an important role in starch production.
- the polysaccharide starch is a polymer made up of chemically uniform building blocks, the glucose molecules. However, it is a very complex mixture of different molecular forms that differ in terms of their degree of polymerization
- Starch is therefore not a uniform raw material.
- amylose and starch an essentially unbranched polymer composed of ⁇ -1,4-glycosidically linked glucose molecules, from amylopectin starch, which in turn is a complex mixture of differently branched glucose chains
- the branches come about through the occurrence of additional ⁇ -1,6-glycosidic linkages.
- the synthesized starch consists of approximately 25% amylose starch and approximately 75% % from amylopectin starch.
- the molecular structure of the starch which is largely determined by the degree of branching, the amylose / amylopectin ratio, the average length and distribution of the side chains and the presence of phosphate groups, is crucial for important functional properties of the starch or its aqueous solutions .
- important functional properties are solubility, retrograding behavior, film-forming properties, viscosity, color stability, gelatinization properties and binding and adhesive properties.
- the starch grain size can also be important for various applications.
- the production of starches containing high amylose is of particular interest for certain applications.
- a modified starch contained in plant cells can advantageously change the behavior of the plant cell under certain conditions.
- starch-containing organs such as seeds or tubers
- modified starches which result in plant cells or plant organs containing this starch being more suitable for further processing, for example in the production of foods such as "popcorn” or "cornflakes” from corn or from chips fries, chips or potato powder from potatoes.
- reducing sugars especially glucose
- Potatoes in particular are often stored at temperatures of 4 to 8 ° C to minimize starch degradation during storage. The reducing sugars released in this way, in particular glucose, lead, for example, to undesired browning reactions (so-called Maillard reactions) in the manufacture of French fries or chips.
- the biochemical pathways that lead to starch building are essentially known.
- the starch synthesis in plant cells takes place in the plastids.
- Important enzymes involved in starch metabolism are, for example, the branching enzymes, ADP-glucose pyrophosphorylases, starch grain-bound starch synthases, soluble starch synthases, debranching enzymes, disproportionation enzymes, plastidic starch phosphorylases, the R1 enzymes, R1 enzymes or glucosidases.
- the object of the present invention is to develop further or alternative genetic engineering approaches for modifying the starch metabolism in starch-forming plants (for example rye, barley, oats, maize, wheat, millet, sago, rice, pea, marker pea, cassava, potato, tomato, rape, Soybean, hemp, flax, sunflower, cow pea, mung bean, bean, banana or arrowroot) to provide suitable nucleic acid molecules by means of which plant cells can be transformed, so that the synthesis of modified, advantageous starch varieties is made possible.
- starch-forming plants for example rye, barley, oats, maize, wheat, millet, sago, rice, pea, marker pea, cassava, potato, tomato, rape, Soybean, hemp, flax, sunflower, cow pea, mung bean, bean, banana or arrowroot
- Such changed starch varieties e.g. Modifications related to their degree of branching, the amylose / amylopectin ratio, the phosphate content, the starch grain size and / or the average length and distribution of the side chains (i.e. side chain structure).
- Another object of the invention is to provide methods which enable the production of transgenic plants which synthesize an altered starch variety.
- transgenic plants which have been transformed with the nucleic acid molecules according to the invention synthesize a starch which has a particular change in its physicochemical properties and / or in its side chain structure, so that the stated objects are achieved by providing the embodiments described in the claims.
- the invention therefore relates to a nucleic acid molecule, coding for a protein with the function of a ⁇ -amylase from potato, selected from the group consisting of a) nucleic acid molecules which code for a protein which has the protein identified under Seq ID NO. 2 amino acid sequence specified or their derivatives or parts, b) nucleic acid molecules which the Seq ID No.
- nucleotide sequence shown or their derivatives or parts comprise or a corresponding ribonucleotide sequence; c) nucleic acid molecules which hybridize with the nucleic acid molecules mentioned under (a) or (b) or are complementary, preferably hybridize specifically and d) nucleic acid molecules whose nucleotide sequence differs from the sequence of the nucleic acid molecules mentioned under (a), (b) or (c) due to the degeneration of the genetic code.
- the present invention relates to a nucleic acid molecule coding for a ⁇ -amylase, which has an amino acid sequence according to Seq. ID No. 2 or their derivatives or parts thereof encoded according to the cDNA insert of the plasmid St-b-Amy (DSM No. 12348).
- the ⁇ -amylase according to the invention is involved in the starch metabolism of the potato and is directly or indirectly involved in the starch biosynthesis.
- the term “derivative” in relation to the ⁇ -amylase protein (or its polypeptide, amino acid sequence) of the invention encompasses one of Seq. ID No. 2 derived polypeptide which contains at least 86 amino acid residues, preferably at least 120, in particular at least 1 55 and very particularly preferably about 163-170 amino acid residues, which consists of the group of amino acid residues consisting of 1 12 V, 1 13 P, 1 14 V , 1 16 V, 1 17 M, 1 19 P, 120 L, 139 L, 142 L, 145 A, 146 G, 147 V, 149 G, 1 51 M, 153 D, 155 W, 156 W, 157 G, 160 E, 1 64 P, 1 67 Y, 169 W, 172 Y, 175 L, 183 G, 184 L, 185 K, 187 Q, 190 M, 191 S, 192 F, 193 H, 195 C, 196 G, 197 G, 198 N,
- ID No. 2 are selected and which contains at least about 1-61, preferably at least 1 22, in particular at least 1 70, more preferably at least 220 and very particularly preferably about 232-241 amino acid residues, which consists of the group of amino acid residues consisting of 1 M, 2 A, 3 M, 4 S, 5 L, 6 P, 7 H, 8 Q, 9 I, 10 G, 1 1 A, 12 L, 13 S, 14 G, 1 5 T, 1 6 S, 1 7 L, 18 T, 19 A, 20 E, 21 T, 22 G, 23 G, 24 V, 25 S, 26 C, 27 E, 28 V, 29 P, 30 A, 31 K, 32 G, 33 S, 34 S, 35 A, 36 T, 38 A, 39 M, 40 W, 41 R, 42 T, 44 M, 45 T, 46 N, 47 L, 48 K, 49 V, 50 S, 51 V, 52 Q , 53 K, 54 T, 55 G, 56 T, 57 E, 58 I, 59 D, 60 R, 61 V, 62 S,
- the term “part” in relation to the ⁇ -amylase protein (polypeptide, amino acid sequence) according to the invention comprises a poly- or oligopeptide consisting of at least about 10-19, preferably at least 80, more preferably at least 1 60, particularly preferably at least 320 and most preferably about 400-550 of the amino acid residues of the ⁇ -amylase or their derivatives encoded by the nucleic acid molecule according to the invention.
- the present invention further relates to a nucleic acid molecule which a nucleic acid molecule according to Seq. ID No. 1 contains, according to the cDNA insert of the plasmid deposited with the DSZM on July 24, 1998, DSM No. 12348 or its derivatives or parts, in particular the coding region or its derivatives or parts.
- the term “derivative” in relation to the nucleic acid molecule according to the invention comprises a polynucleotide which contains at least 246 nucleotides, preferably at least 344, in particular at least 443, and very particularly preferably about 467-487 nucleotides, selected from the group consisting of 241 T, 245 T, 257 C, 268 G, 272 A, 279 T, 285 A, 290 A, 291 G, 307 A, 309 G, 31 1 A, 314 C, 320 A, 322 A, 323 A, 325 G, 334 G, 335 T, 337 C, 338 C, 340 G, 341 T, 343 T, 346 G, 347 T, 349 A, 350 T, 351 G, 353 T, 355 C, 356 C , 359 T, 361 G, 368 T, 370 A, 386 T, 400 G,
- nucleotide or amino acid sequences according to the invention according to Seq ID No. 1 or Seq. ID no. 2 are also understood as derivatives of said sequences according to the invention in which the numbering of the individual sequence elements can differ from that of the sequences ID no. 1 or no. 2 according to the invention.
- the decisive factor here is a significant correspondence of at least one sequence section (“part”) with the sequence according to the invention. According to the general technical knowledge, such matches can easily be determined, for example, by suitable computer programs, for example by carrying out a sequence comparison of the sequence according to the invention with a sequence in question to be compared (so-called “sequence alignment”).
- Computer programs of this type which can be purchased, for example, (for example Omiga ⁇ , version 1 .1 .3. From Oxford Molecular Ltd., Oxford, UK) and which are in part also an integral part of sequence databases (for example EMBL, GenBank) , identify, for example, the best possible match of identical or possibly chemically equivalent sequence elements and take into account in particular the presence of insertions and / or deletions, which can lead to a shift of individual sequence elements or of sequence sections and in this way can influence the numbering of the sequence elements or sequence sections.
- sequence databases for example, the best possible match of identical or possibly chemically equivalent sequence elements and take into account in particular the presence of insertions and / or deletions, which can lead to a shift of individual sequence elements or of sequence sections and in this way can influence the numbering of the sequence elements or sequence sections.
- the term “derivative” in relation to the nucleic acid molecule according to the invention which codes for a ⁇ -amylase encompasses a nucleic acid molecule which is obtained by addition, deletion, insertion or recombination of one or more nucleotides from Seq. ID No. 1 deviates and fulfills the conditions as defined above.
- the term “derivative” in relation to the nucleic acid molecule according to the invention which codes for a ⁇ -amylase includes a complementary or a reversely complementary sequence (polynucleotide) of the nucleic acid molecule according to the invention or of derivatives or parts thereof.
- part referring to the nucleic acid molecule encoding a ⁇ -amylase according to this invention encompasses a poly- or oligonucleotide consisting of at least about 1-535, preferably at least about 36-100, especially at least 200, more preferably at least 400, particularly preferably at least 800 and most preferably about 1400-1700 of the nucleotides of a nucleic acid molecule according to the invention which codes for a ⁇ -amylase, or their derivatives.
- the terms “derivative” and / or “part” according to the present invention comprise a polynucleotide, or a poly- or oligopeptide as defined above, which has a functional and / or structural equivalent of the ß- obtained from potato Amylase gene (ie the nucleic acid molecule which codes for the ⁇ -amylase) or ⁇ -amylase polypeptide.
- the term “functional and / or structural equivalence” generally means the same, an equivalent or similar function of the corresponding molecule of the invention, if appropriate in particular a biological function.
- Another object of the invention is a recombinant nucleic acid molecule containing a) a nucleotide sequence coding for a protein with the function of a ⁇ -amylase, preferably from potato, or parts of said nucleotide sequence and b) one or more nucleotide sequences which code for a protein selected from the group Group A, consisting of proteins with the function of branching enzymes, ADP-glucose pyrophosphorylases, starch-bound starch synthases, soluble starch synthases, debranching enzymes, disproportionation enzymes, plastid starch phosphorylases, R1 enzymes, amylases, glucosidases, selected from parts of nucleotides for nucleotides Group A and nucleic acid molecules which hybridize with one of said nucleotide sequences or parts thereof, preferably a deoxyribonucleic acid or ribonucleic acid molecule, particularly preferably a
- the nucleic acid according to the invention coding for a protein with the function of a ⁇ -amylase from potato is described by Seq. ID No. 1, the protein encoded by the nucleotide sequence by Seq. ID No. 2.
- Seq. ID NO. 1 attaatattattattatggcaatgagtctgccacaccagatcggtgccttatcaggaaca tcgctcacggcggaaaccggtggagtttcatgcgaagttccggcgaaggggagttcagct acatcagctatgtggagaacaccgatgacgaatttaaaagtatcggtacaaaaacagga actgaaattgacagggtgtcgcgtcgcgtcgcgcgatgagtccgatgatgggagga ggaatgcggccggatttattagcgtgtcaagcgttgatggaagctcaggtagatgaggta gttgagaatataaggttaggaattcgtcggagaaagagaagagaatataaggt
- the ⁇ -amylase nucleotide sequence according to the invention points to known ⁇ -amylase-coding molecules (Wang et al., 1997, Plant Physiol. 1 13 (2): 403-409; Yoshigi et al., 1994, Biotechn. & Biochem. 58 (6): 1080-1086; Monroe et al., 1991, Plant Physiol. 97: 1 599-1 601) have a comparatively low sequence homology.
- the amino acid sequence also differs from the ⁇ -amylases described in the prior art by an additional N-terminal sequence (amino acids from position 1-25), which is also represented accordingly at the level of the nucleotide sequence.
- Nucleotide sequences which are suitable according to the invention and which code for a group A protein are described, for example, for soluble (type I, II, IM or IV) or starch-bound starch synthase isoforms in Hergersberg, 1988, dissertation, University of Cologne; Abel, 1995, dissertation FU Berlin; Abel et al., 1996 Plant Journal 10 (6): 981-991; Visser et al., 1989, Plant Be. 64: 185-192; van der Leij et al., 1991, Mol. Gen. Genet.
- branching enzyme isoforms branching enzyme I, lia or Mb
- debranching enzyme isoforms debranching enzyme, isoamylases, pulluianases, R1 enzymes
- disproportionation enzyme isoforms for example described in WO 92/14827; WO 95/07335; WO 95/09922; WO 96/19581; WO 97/22703; WO 97/32985; WO 97/42328; Takaha et al., 1993, J.
- nucleotide sequences to be used according to the invention are of pro- or eukaryotic origin, preferably of bacterial, fungal or vegetable origin.
- parts of nucleotide sequences means parts of the nucleotide sequences to be used according to the invention which are at least 15 bp, preferably at least 150 bp, particularly preferably at least 500 bp, but a length of 5000 bp, preferably 2500 bp do not exceed.
- hybridization means hybridization under conventional hybridization conditions, preferably under stringent conditions, as described, for example, in Sambrook et al., Molecular Cloning, A Laboratory Manual, 2nd ed. (1989) Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY).
- a “specific hybridization” is particularly preferably carried out under the following highly stringent conditions:
- Hybridization buffer 2 x SSC; 10 x Denhardt's solution (Fikoll 400 + PEG + BSA;
- Herring sperm DNA 50 ⁇ g / ml tRNA; or 0.25 M sodium phosphate buffer pH 7.2; 1mM EDTA; 7% SDS in one
- the molecules hybridizing with the nucleic acid molecules according to the invention also include fragments, derivatives and allelic variants of the nucleic acid molecules according to the invention. Fragments include parts of the nucleic acid mo- understood molecules that are long enough to code part of the proteins described.
- the term derivative in this context means that the sequences of these molecules differ from the sequences of the nucleic acid molecules according to the invention at one or more positions and have a high degree of homology to these sequences.
- Homology means a sequence identity of at least 60%, preferably over 70% and particularly preferably over 85%.
- the deviations from the nucleic acid molecules according to the invention can be caused by deletions, substitutions, insertions or recombinations.
- nucleic acid molecules which are homologous to the molecules according to the invention and which are derivatives of these molecules are generally variations of these molecules which are modifications which have the same biological function. These can be both naturally occurring variations, for example sequences from other plant species, or mutations, wherein these mutations can have occurred naturally or have been introduced by targeted mutagenesis. Furthermore, the variations can be synthetically produced sequences.
- allelic variants can be both naturally occurring variants and also synthetically produced variants or those produced by recombinant DNA techniques.
- the nucleic acid molecules according to the invention can be DNA molecules, in particular cDNA or genomic molecules. Furthermore, the nucleic acid molecules according to the invention can be RNA molecules.
- the nucleic acid molecules according to the invention or parts thereof can e.g. B. obtained from natural sources, be produced by recombinant techniques or synthetically.
- To express the nucleic acid molecules according to the invention in sense or antisense orientation in plant cells these are linked to regulatory DNA elements which ensure transcription in plant cells. These include promoters in particular. In general, any promoter active in plant cells can be used for the expression.
- the promoter can be selected so that the expression takes place constitutively or only in a certain tissue, at a certain time in plant development or at a time determined by external influences, which can be chemically or biologically inducible, for example.
- the promoter - like the nucleotide sequence - can be homologous or heterologous.
- Suitable promoters are, for example, the 35S RNA promoter of the Cauliflower Mosaic Virus for constitutive expression, the patatin gene promoter B33 (Rocha-Sosa et al., 1989, EMBO J.
- a termination sequence terminating the nucleic acid molecule according to the invention can serve for the correct termination of the transcription and the addition of a poly-A tail to the transcript, which is assigned a function in stabilizing the transcripts.
- Such elements are described in the literature (cf. Gielen et al., 1989, EMBO J. 8: 23-29) and are interchangeable.
- the nucleic acid molecules according to the invention can be used for the production of transgenic plant cells and plants which are increased or decreased in the activity of the ⁇ -amylase or in the activity of the ⁇ -amylase and at least one further enzyme of starch metabolism.
- the nucleic acid molecules according to the invention are introduced into suitable vectors, with the necessary regulatory nucleic acid sequences for efficient transcription provided in plant cells and introduced into plant cells.
- the nucleic acid molecules according to the invention for inhibiting the synthesis of the endogenous ⁇ -amylase or the endogenous ⁇ -amylase and at least one further protein from group A in the cells.
- nucleic acid molecules according to the invention can be used to express the ⁇ -amylase or the ⁇ -amylase and at least one further protein of group A in cells of transgenic plants and thus lead to an increase in the activity of the respectively expressed enzymes in the cells.
- nucleic acid molecules according to the invention to inhibit the synthesis of the endogenous ⁇ -amylase and the overexpression of at least one other Group A protein in the cells.
- nucleic acid molecules according to the invention can also be used to express ⁇ -amylase and to inhibit at least one further group A protein in cells of transgenic plants.
- the latter two embodiments of the invention thus lead to a simultaneous inhibition and increase in the activities of the respectively inhibited or expressed enzymes in the cells.
- Another object of the invention is a vector containing a nucleic acid molecule according to the invention.
- vector encompasses plasmids, cosmids, viruses, bacteriophages and other vectors which are common in genetic engineering and which contain the nucleic acid molecules according to the invention and are suitable for transforming cells.
- Such vectors are preferably suitable for transforming plant cells. Especially they preferably allow the nucleic acid molecules according to the invention to be integrated into the genome of the plant cell, optionally together with flanking regulatory regions. Examples of this are binary vectors, such as pBinAR or pBinB33, which can be used in the gene transfer mediated by agrobacteria.
- the vector according to the invention is characterized in that the nucleotide sequence which codes for a protein with the function of a ⁇ -amylase or whose parts are present in the sense or anti-sense direction.
- the vector according to the invention is characterized in that the nucleotide sequence which codes for one or more proteins selected from group A or parts thereof is present in the sense or anti-sense direction.
- the vector according to the invention is characterized in that the nucleotide sequence which codes for a plurality of proteins selected from group A or parts thereof is present partly in the sense direction and partly in the anti-sense direction.
- the vector according to the invention is very particularly preferably linked to regulatory elements which express, i.e. e.g. ensure the transcription and synthesis of an RNA, which can be translated in the case of a nucleotide sequence present in the sense direction, in a pro- or eukaryotic cell.
- deletions at the 5 'end of the DNA sequence make it possible, for example, to specifically produce enzymes which, by removing the corresponding transit or signal sequences, no longer in their original (homologous) compartment, but in the cytosol, or due to the addition of other signal sequences are located in one or more other (heterologous) compartments.
- the DNA sequences according to the invention or parts of these sequences can be introduced into plasmids which permit mutagenesis or a sequence change by recombination of DNA sequences.
- Base exchanges can be carried out or natural or synthetic sequences can be added.
- adapters or links can be attached to the fragments.
- Manipulations which provide suitable restriction sites or which remove excess DNA or restriction sites can also be used. Where insertions, deletions or substitutions are possible, ' rro mutagenesis, primer repair, restriction or ligation can be used.
- Another object of the invention is a host cell, in particular prokaryotic or eukaryotic cells, preferably bacterial or plant cells (for example from E.
- nucleic acid molecule or a vector according to the invention contains a nucleic acid molecule or a vector according to the invention or that of a cell containing a nucleic acid molecule according to the invention or a vector according to the invention was transformed.
- Another object of the invention is a host cell, in particular prokaryotic or eukaryotic cells, preferably bacterial or plant cells (for example from E. coli, Agrobacterium, Solananceae, Poideae, rye, barley, oats, corn, wheat, millet, sago, rice, Pea, marker pea, cassava, potato, tomato, rapeseed, soybean, hemp, flax, sunflower, cow pea, mung bean, bean, banana or arrowroot), which in addition to a recombinant nucleic acid molecule coding for a protein with the function of a ⁇ -amylase, one or contains a number of further recombinant nucleic acid molecules which code for a protein selected from group A, or parts thereof or nucleotide sequences which hybridize with these nucleic acid molecules.
- prokaryotic or eukaryotic cells preferably bacterial or plant cells (for example from E. coli, Agrobacterium, Solan
- the host cells according to the invention can optionally also be produced by successive transformation (so-called "super transformation”), in that individual nucleotide sequences or vectors containing nucleotide sequences which code for a protein with the function of branching enzymes, ADP-giucose pyrophosphorylases , Starch grain-bound starch synthases, soluble starch synthases I, II, III or IV, branching enzymes, disproportionation enzymes, plastid starch phosphorylases, R1 enzymes, amylases, glucosidases, parts thereof, and nucleic acid molecules which hybridize with one of the said nucleotide sequences or parts thereof , successive cell transformations.
- successive transformation in that individual nucleotide sequences or vectors containing nucleotide sequences which code for a protein with the function of branching enzymes, ADP-giucose pyrophosphorylases , Starch grain-bound starch synthases, soluble starch
- Another embodiment of the present invention relates to a method for producing a transgenic plant cell which synthesizes a modified starch, characterized in that a nucleic acid molecule or a vector according to the invention is integrated into the genome of a plant cell.
- nucleic acid molecules according to the invention it is possible, using genetic engineering methods, to intervene in the starch metabolism of plants and to change it in such a way that a modified starch is synthesized which, for example, in terms of structure, water content, protein content, lipid content, fiber content, Ash / phosphate content,
- Amylose / amylopectin ratio molecular weight distribution, degree of branching, grain size and shape as well as crystallization or also in their physicochemical properties such as flow and sorption behavior, gelatinization temperature, viscosity, thickening performance, solubility, paste structure, transparency, heat, shear and acid stability, tendency to retrogradation, Gel formation, freeze / thaw stability, complex formation, iodine binding, film formation, adhesive strength, enzyme stability, digestibility or reactivity is changed in comparison to starch synthesized in wild-type plants.
- the synthesized protein can be localized in any compartment of the plant cell.
- the transit or signal sequence ensuring the localization may have to be deleted (removed) and the remaining coding region possibly linked to DNA sequences, which ensure localization in the respective compartment.
- sequences are known (see for example Braun et al., EMBO J. 11 (1992), 3219-3227; Wolter et al., Proc. Natl. Acad. Sci. USA 85 (1988), 846-850; Sonnewald et al., Plant J. 1 (1991), 95-106).
- the production of plant cells with a reduced activity of a protein involved in starch metabolism can be achieved, for example, by expressing an appropriate antisense RNA, a sense RNA to achieve a cosuppression effect, in vivo mutagenesis or the expression of a correspondingly constructed ribozyme that specifically cleaves transcripts which encode one of the proteins involved in starch metabolism, using a nucleic acid molecule according to the invention, preferably by expression of an antisense transcript.
- a DNA molecule can be used that comprises the entire sequence coding for a protein involved in starch metabolism, including any flanking sequences that may be present, as well as DNA molecules that only comprise parts of the coding sequence, these parts having a minimum length of 1 5 bp, preferably of at least 100-500 bp, and in particular of over 500 bp.
- DNA molecules are used which are shorter than 5000 bp, preferably shorter than 2500 bp.
- DNA sequences which have a high degree of homology to the sequences of the DNA molecules according to the invention, but which are not completely identical. The minimum homology should be greater than approximately 65%. The use of sequences with a homology of 75% and in particular 80% is preferred.
- ribozymes for reducing the activity of certain proteins in cells is known to the person skilled in the art and is described, for example, in EP-B1-0 321 201.
- the expression of ribozymes in plant cells was e.g. described in Feyter et al. (Mol. Gen. Genet. 250 (1996), 329-338).
- the reduction of the proteins involved in starch metabolism in the plant cells according to the invention can also be achieved by the so-called "in vivo mutagenesis", in which a hybrid RNA-DNA oligonucleotide ("chimeroplast”) is introduced into cells by transforming cells (Kipp PB et al, Poster session at.
- in vivo mutagenesis in which a hybrid RNA-DNA oligonucleotide (“chimeroplast”) is introduced into cells by transforming cells (Kipp PB et al, Poster session at.
- Part of the DNA component of the RNA-DNA oligonucleotide used here is homologous to a nucleic acid sequence of an endogenous protein, but has a mutation in comparison to the nucleic acid sequence of the endogenous protein or contains a heterologous region which is enclosed by the homologous regions.
- the mutation or contained in the DNA component of the RNA-DNA oligonucleotide can heterologous region can be transferred into the genome of a plant cell. This leads to a reduction in the activity of the protein involved in starch metabolism.
- the enzyme activities involved in starch metabolism in the plant cells can be reduced by a cosuppression effect.
- This method is known to the person skilled in the art and is described, for example, in Jorgensen (Trends Biotechnol. 8 (1990), 340-344), Niebel et al., (Curr. Top. Microbiol. Immunol. 197 (1995), 91-103), Flavell et al. (Curr. Top. Microbiol. Immunol. 197 (1995), 43-46), Palaqui and Vaucheret (Plant. Mol. Biol. 29 (1995), 149-159), Vaucheret et al., (Mol. Gen. Genet 248 (1995), 31 1 -317), de Borne et al. (Mol. Gen. Genet. 243 (1994), 613-621) and other sources.
- DNA molecules can be used for the transformation, which simultaneously contain several regions coding for the corresponding enzymes in antisense orientation under the control of a suitable promoter.
- Each sequence can alternatively be under the control of its own promoter, or the sequences can be transcribed as a fusion from a common promoter, so that the synthesis of the proteins in question is inhibited to approximately the same or different extent.
- the length of the individual coding regions which are used in such a construct what has already been stated above for the production of antisense constructs applies. In principle, there is no upper limit for the number of antisense fragments transcribed from a promoter in such a DNA molecule. However, the resulting transcript should generally not exceed a length of 25 kb, preferably 1 5 kb.
- nucleic acid molecules according to the invention With the aid of the nucleic acid molecules according to the invention, it is possible to transform plant cells and to inhibit the synthesis of several enzymes at the same time. Furthermore, the nucleic acid molecules according to the invention can be introduced into classic mutants which are defective or defective in relation to one or more genes of starch biosynthesis (Shannon and Garwood, 1984, in Whistler, BeMiller and Paschall, Starch: Chemistry and Technology, Academic Press, London, 2nd edition: 25-86).
- defects can relate, for example, to the following proteins: starch-grain-bound (GBSS I) and soluble starch synthases (SSS I, II, III and IV), branching enzymes (BE I, ILA and Mb), "debranching" enzymes (R-enzymes , Isoamylases, pullulanases), disproportionation enzymes and plastid starch phosphorylases.
- GBSS I starch-grain-bound
- SSS I, II, III and IV soluble starch synthases
- BE I, ILA and Mb branching enzymes
- R-enzymes "debranching" enzymes
- Isoamylases Isoamylases
- pullulanases pullulanases
- disproportionation enzymes plastid starch phosphorylases.
- the present invention thus also relates to transgenic plant cells obtainable by a method according to the invention, which have been transformed with a nucleic acid molecule or vector according to the invention, and to transgenic plant cells which originate from cells transformed in this way.
- the cells according to the invention contain a nucleic acid molecule according to the invention, this being preferably linked to regulatory DNA elements which ensure transcription in plant cells, in particular with a promoter.
- the cells according to the invention can be distinguished from naturally occurring plant cells, inter alia, in that they contain a nucleic acid molecule according to the invention which does not naturally occur in these cells or in that such a molecule is integrated at a location in the genome of the cell where it is not otherwise occurs, ie in a different genomic environment.
- the transgenic plant cells according to the invention can be distinguished from naturally occurring plant cells in that they contain at least one copy of a nucleic acid molecule according to the invention stably integrated into their genome, if appropriate in addition to copies of such a molecule which occur naturally in the cells. If the nucleic acid molecule (s) introduced into the cells is an additional copy of the molecules already naturally occurring in the cells, the plant cells according to the invention can be made of naturally occurring ones distinguish by the fact that this additional copy (s) is (are) located at locations in the genome where they do not naturally occur. This can be checked, for example, using a Southern blot analysis.
- Plant cells according to the invention are preferred in which the enzyme activity of individual enzymes involved in starch metabolism is increased or decreased by at least 10%, particularly preferably at least 30% and very particularly preferably by at least 50%.
- the plant cells according to the invention can preferably be distinguished from naturally occurring plant cells by at least one of the following features: If the introduced nucleic acid molecule according to the invention is heterologous in relation to the plant cell, the transgenic plant cells have transcripts of the introduced nucleic acid molecules according to the invention. These can e.g. B. by Northern blot analysis.
- the plant cells according to the invention contain one or more proteins which are encoded by an introduced nucleic acid molecule according to the invention. This can e.g. B. by immunological methods, in particular by Western blot analysis.
- the cells according to the invention can be distinguished from naturally occurring cells, for example due to the additional expression of nucleic acid molecules according to the invention.
- the transgenic plant cells contain, for example, more or fewer transcripts of the nucleic acid molecules according to the invention. This can e.g. B. can be detected by Northern blot analysis.
- "More” or “less” preferably means at least 10% more or less, preferably at least 20% more or less and particularly preferably at least 50% more or less transcripts than corresponding non-transformed cells.
- the cells preferably also have a corresponding (at least 10%, 20% or 50%) increase or decrease in the content of protein according to the invention.
- the transgenic plant cells can be regenerated into whole plants using techniques known to those skilled in the art.
- the plants obtainable by regeneration of the transgenic plant cells according to the invention and processes for producing transgenic plants by regeneration of whole plants from the plant cells according to the invention are likewise the subject of the present invention.
- the invention furthermore relates to plants which contain the transgenic plant cells according to the invention.
- the transgenic plants can in principle be plants of any species, i.e. both monocot and dicot plants. They are preferably useful plants, i.e. Plants that are cultivated by humans for purposes of nutrition or for technical, especially industrial purposes. These are preferably starch-storing plants, e.g.
- Cereals (rye, barley, oats, maize, wheat, millet, sago etc.), rice, peas, marker peas, cassava, potatoes, tomatoes, rapeseed, soybeans, hemp, flax, sunflower, cow peas, mung beans or arrowroot.
- the invention also relates to propagation material of the plants according to the invention, for example fruits, seeds, tubers, rhizomes, seedlings, cuttings, calli, protoplasts, cell cultures etc.
- the change in the enzymatic activities of the enzymes involved in the starch metabolism results in the synthesis of a starch with a different structure in the plants produced by the process according to the invention.
- a large number of cloning vectors are available to prepare the introduction of foreign genes into higher plants, which contain a replication signal for E. coli and a marker gene for the selection of transformed bacterial cells.
- examples of such vectors are pBR322, pUC series, M13mp series, pACYC184 etc.
- the desired sequence can be inserted into the .vector at a suitable restriction site.
- the plasmid obtained is used for the transformation of £ .co // cells. Transformed .co // ' cells are grown in a suitable medium, then harvested and lysed. The plasmid is recovered.
- Restriction analyzes, gel electrophoresis and other biochemical-molecular biological methods are generally used as the analysis method for characterizing the plasmid DNA obtained (Sambrook et al. Loc.cit.). After each manipulation, the plasmid DNA can be cleaved and DNA fragments obtained can be linked to other DNA sequences. Each plasmid DNA sequence can be cloned in the same or different plasmids.
- a variety of techniques are available for introducing DNA into a plant host cell. These techniques include the transformation of plant cells with T-DNA using Agrobacterium tumefaciens or Agrobacterium rhizogenes as a transformation agent, the fusion of protoplasts using polyethylene glycol (PEG), the injection, the electroporation of DNA, the introduction of DNA using the biolistic method and More options.
- Agrobacterium tumefaciens or Agrobacterium rhizogenes as a transformation agent
- PEG polyethylene glycol
- DNA When DNA is injected and electroporated into plant cells, there are no special requirements for the plasmids or DNA used. Simple plasmids such as e.g. pUC derivatives can be used. If whole plants are to be regenerated from such transformed cells, the presence of a selectable marker gene is necessary.
- Simple plasmids such as e.g. pUC derivatives can be used. If whole plants are to be regenerated from such transformed cells, the presence of a selectable marker gene is necessary.
- the Ti or Ri plasmid is used for the transformation of the plant cell, then at least the right boundary, but often the right and left boundary of the Ti and Ri plasmid T-DNA as a flank region, must be linked to the genes to be introduced.
- Agrobacteria are used for the transformation, the DNA to be introduced must be cloned into special plasmids, either in an intermediate vector or in a binary vector.
- the intermediate vectors can be integrated into the Ti or Ri plasmid of the agrobacteria on the basis of sequences which are homologous to sequences in the T-DNA by homologous recombination.
- Intermediate vectors cannot replicate in agrobacteria. Using a helper plasmid, the intermediate vector can be transferred to Agrobacterium tumefaciens (conjugation).
- Binary vectors can replicate in both E. coli and agrobacteria. They contain a selection marker gene and a linker or polylinker, which are framed by the right and left T-DNA border region. They can be transformed directly into the agrobacteria (Holsters et al. (1978) Mol. Gen. Genet. 1 63: 181-187).
- the agrobacterium serving as the host cell should contain a plasmid bearing a wr region. The wir region is necessary for the transfer of the T-DNA into the plant cell. Additional T-DNA may be present.
- the agrobacterium transformed in this way is used to transform plant cells.
- T-DNA for the transformation of plant cells has been intensively investigated and is sufficiently described in EP 12051 6; Hoekema, In: The Binary Plant Vector System Offsetdrukkerij Kanters B.V., Alblasserdam (1985), Chapter V; Fraley et al., Crit. Rev. Plant. Sci., 4: 1-46 and An et al. (1985) EMBO J. 4: 277-287.
- plant exhibits can expediently be cocultured with Agrobacterium tumefaciens or Agrobacterium rhizogenes.
- Whole plants can then again be made from the infected plant material (for example leaf pieces, stem segments, roots, but also protoplasts or suspension-cultivated plant cells) in a suitable medium, which may contain antibiotics or biocides for the selection of transformed cells be regenerated.
- the plants thus obtained can then be examined for the presence of the introduced DNA.
- Other possibilities of introducing foreign DNA using the biolistic method or by protoplast transformation are known (see, for example, Willmitzer, L, 1993 Transgenic plants. In: Biotechnology, A Multi-Volume Comprehensive Treatise (HJ Rehm, G. Reed, A. Pühler, P. Stadler, eds.), Vol. 2, 627-659, VCH Weinheim-New York-Basel-Cambridge).
- EP 292 435 describes a process by means of which fertile plants can be obtained starting from a slimy, soft (friable) granular corn callus.
- Shillito et al. Bio / Technology 7 (1989), 581) have observed in this connection that for the regenerability to fertile plants it is also necessary to start from callus suspension cultures from which a dividing protoplast culture, with the ability to regenerate plants, can be produced. After an in vitro cultivation time of 7 to 8 months, Shillito et al. Plants with viable offspring, but which have abnormalities in morphology and reproductivity.
- Prioli and Sondahl (Bio / Technology 7 (1989), 589) also describe the regeneration and extraction of finished maize plants from vlais protoplasts.
- the introduced DNA is integrated in the genome of the plant cell, it is generally stable there and is also retained in the progeny of the originally transformed cell. It usually contains a selection marker that gives the transformed plant cells resistance to a biocide or an antibiotic such as kanamycin, G 418, bleomycin, hygromycin or phosphinothricin and others. taught.
- the individually chosen marker should therefore allow the selection of transformed cells from cells that lack the inserted DNA.
- the transformed cells grow within the plant in the usual way (see also McCormick et al. (1986) Plant Cell Reports 5: 81-84).
- the resulting plants can be grown normally and crossed with plants that have the same transformed genetic makeup or other genetic makeup.
- the resulting hybrid individuals have the corresponding phenotypic characteristics.
- Two or more generations should be grown to ensure that the phenotypic trait is stably maintained and inherited. Seeds should also be harvested to ensure that the appropriate phenotype or other traits have been preserved.
- Another object of the invention is a process for the production of starch in a manner known per se, in which plant cells, plants, plant parts or propagation material according to the invention are processed or integrated into the process.
- Processes for extracting the starch from plants or from starch-storing parts of plants are known to the person skilled in the art.
- Process for extracting starch from Corn seeds are e.g. B. in Eckhoff et al. (Cereal Chem. 73 (1996) 54-57).
- the extraction of maize starch on an industrial scale is usually achieved by so-called "wet milling”.
- methods for extracting the starch from various starch-storing plants are described, e.g. B. in "Starch: Chemistry and Technology (Ed .: Whistler, BeMiller and Paschall (1994), 2nd edition, Academic Press Inc. London Ltd; ISBN 0-1 2-746270-8; see e.g. chapter
- the transgenic plant cells and plants according to the invention synthesize a starch whose physicochemical properties have been changed, for example, compared to starch synthesized in wild-type plants.
- Yet another object of the invention is starch, which can be obtained from a plant cell, plant, its propagation material or a method according to the invention.
- Another embodiment of the present invention also includes the industrial use of the starch according to the invention for the production of foods, packaging materials or disposable articles.
- the starch according to the invention can be prepared by methods known to those skilled in the art be modified and is suitable in unmodified or modified form for various uses in the food or non-food sector.
- the possible uses of the starch according to the invention can basically be divided into two large areas.
- One area comprises the hydrolysis products of starch, mainly glucose and glucose building blocks, which are obtained by enzymatic or chemical processes. They serve as the starting material for further chemical modifications and processes, such as fermentation.
- the simplicity and cost-effective execution of a hydrolysis process can be important here, as is currently carried out essentially enzymatically using amyloglucosidase. It would be conceivable to save costs by using fewer enzymes.
- Starch is a classic additive for many foods, where it essentially takes on the function of binding aqueous additives or increases the viscosity or increases gel formation. Important characteristics are the flow and sorption behavior, the swelling and gelatinization temperature, the viscosity and thickening performance, the solubility of the starch, the transparency and paste structure, the heat, shear and acid stability, the tendency to retrogradation, the ability to form films, the Freeze / thaw stability, digestibility and the ability to form complexes with, for example, inorganic or organic ions. 2.
- starch is used as an additive for different manufacturing processes or as an additive in technical products.
- starch is primarily used for retardation (retention of solids), the setting of filler and fine particles, as a strengthening agent and for drainage.
- the favorable properties of the starch in terms of rigidity, hardness, sound, grip, gloss, smoothness, splitting resistance and surfaces are exploited.
- starches A large area of use of starches is in the adhesive industry, where the possible uses are divided into four areas: use as pure starch glue, use in those prepared with special chemicals Starch glues, the use of starch as an additive to synthetic resins and polymer dispersions and the use of starch as an extender for synthetic adhesives.
- 90% of the starch-based adhesives are used in the fields of corrugated cardboard, paper bags, bags and pouches, composite materials for paper and aluminum, cardboard packaging and rewetting glue for envelopes, stamps, etc.
- starch as a sizing agent, i.e. as an auxiliary for smoothing and strengthening the hook-and-loop behavior to protect against the tensile forces acting during weaving and to increase the abrasion resistance during weaving, starch as an agent for textile finishing, especially after quality-reducing pretreatments such as bleaching, dyeing etc., starch as a thickening agent in the manufacture of color pastes to prevent dye diffusion and starch as an additive to chaining agents for sewing threads.
- the fourth area of application is the use of starches as an additive in building materials.
- One example is the production of gypsum plasterboard, in which the starch mixed in the gypsum slurry pastes with the water, diffuses to the surface of the gypsum board and binds the cardboard to the board there.
- Other areas of application are admixing to plaster and mineral fibers.
- starch products are used to delay setting.
- starch products lends itself to the manufacture of soil stabilization agents, which are used in the case of artificial earth movements temporary protection of the soil particles against water can be used.
- Combined products made of starch and polymer emulsions are, according to current knowledge, equivalent to the products previously used in their erosion and incrustation-reducing effects, but are priced significantly below these.
- starch in crop protection agents to change the specific properties of the preparations. This is how starches are used to improve the wetting of crop protection agents and fertilizers, to release the active substances in a dosed manner, to convert liquid, volatile and / or malodorous substances into microcrystalline, stable, moldable substances, to mix incompatible compounds and to extend the duration of action by reducing the decomposition used.
- starches are used as binders for tablets or for binder dilution in capsules. Starches also serve as tablet disintegrants since they absorb liquid after swallowing and swell to such an extent after a short time that the active substance is released. Medical lubricant and wound powders are based on starch for qualitative reasons. In the field of cosmetics, starches are used, for example, as carriers for powder additives such as fragrances and salicylic acid. A relatively large area of application for starch is toothpaste.
- Starch is used as an additive to coal and briquette. Coal can be agglomerated or briquetted with a high-quality addition of starch, which prevents the briquettes from breaking down prematurely.
- the starch addition is between 4 and 6% for barbecued coal and between for calorified coal 0, 1 and 0.5%. Furthermore, starches are becoming increasingly important as binders, since their addition to coal and briquette can significantly reduce the emissions of harmful substances.
- Starch can also be used as a flocculant in ore and coal sludge processing.
- Another area of application is as an additive to foundry additives.
- Various casting processes require cores that are made from binder-mixed sands.
- Bentonite which is mixed with modified starches, mostly swelling starches, is predominantly used today as a binder.
- the purpose of the starch addition is to increase the flow resistance and to improve the binding strength.
- the swelling starches can have other production requirements, such as dispersibility in cold water, rehydration, good miscibility in sand and high water retention capacity.
- Starch is used in the rubber industry to improve technical and optical quality. The reasons for this are the improvement of the surface gloss, the improvement of the handle and the appearance, for this reason starch is sprinkled on the sticky rubberized surfaces of rubber materials before the cold vulcanization, and the improvement of the printability of the rubber.
- starch secondary products in the processing process (starch is only a filler, there is no direct link between synthetic polymer and starch) or, alternatively, the integration of starch secondary products in the production of polymers (starch and polymer are one firm bond).
- starch as a pure filler is not competitive compared to other substances like talc. It is different if the specific starch properties come into play and this significantly changes the property profile of the end products.
- An example of this is the use of starch products in the processing of thermoplastics, such as polyethylene.
- the starch and the synthetic polymer are combined by co-expression in a ratio of 1: 1 to form a 'master batch', from which various products are made with granulated polyethylene using conventional processing techniques.
- starch in polyurethane foams.
- starch derivatives By adapting the starch derivatives and by optimizing the process, it is possible to control the reaction between synthetic polymers and the hydroxyl groups of the starches.
- the result is polyurethane films which, through the use of starch, obtain the following property profiles: a reduction in the coefficient of thermal expansion, a reduction in shrinkage behavior, an improvement in pressure / stress behavior, an increase in Permeability to water vapor without changing the water absorption, reducing the flammability and the tear density, no dripping of flammable parts, freedom from halogen and reduced aging.
- Disadvantages that are currently still present are reduced compressive strength and reduced impact resistance.
- Solid plastic products such as pots, plates and bowls can also be manufactured with a starch content of over 50%.
- starch / polymer mixtures can be assessed favorably because they have a much higher biodegradability.
- starch graft polymers Because of their extreme water-binding capacity, starch graft polymers have also become extremely important. These are products with a backbone made of starch and a side grid of a synthetic monomer grafted on according to the principle of the radical chain mechanism.
- the starch graft polymers available today are characterized by better binding and retention properties of up to 1000 g of water per g of starch with high viscosity.
- the areas of application for these superabsorbents have expanded significantly in recent years and are in the hygiene area with products of diapers and pads as well as in the agricultural sector, e.g. seed pilling.
- modified starches by means of genetic engineering methods can, on the one hand, the properties of e.g. Change the starch obtained from the plant so that further modifications by means of chemical or physical changes no longer appear to be necessary.
- starches modified by genetic engineering processes can also be subjected to further chemical modifications, which leads to further improvements in quality for certain of the areas of use described above.
- These chemical modifications are generally known. In particular, these are modifications by heat and pressure treatment, treatment with organic or inorganic acids, enzymatic treatment, oxidations and esterifications, which e.g. lead to the formation of phosphate, nitrate, sulfate, xanthate, acetate and citrate starches.
- monohydric or polyhydric alcohols can be used in the presence of strong acids to produce starch ethers, so that starch alkyl ether, O-allyl ether, hydroxyl alkyl ether, O-carboxylmethyl ether, N-containing starch ether, P-containing starch ether, S-containing starch ether , cross-linked starches or starch graft polymers result.
- the starches according to the invention are used in industrial applications, preferably for food or in the production of packaging materials and disposable articles.
- Buffer A 50 mM Tris-HCl pH 8.0
- Buffer B 50mM Tris-HCl pH 7.6 2.5mM DTT 2mM EDTA
- Buffer C 0.5 M sodium citrate pH 7.6 50 mM Tris-HCl pH 7.6 2.5 mM DTT 2 mM EDTA
- the vector pBluescript II SK (Stratagene) was used for cloning in E. coli.
- the gene constructions were cloned into the binary vector pBinAR Hyg (Höfgen & Willmitzer, 1 990r Plant Sei. 66: 221-230) and pBinB33-Hyg.
- the f. co // strain DH5 ⁇ (Bethesda Research Laboratories, Gaithersburgh, USA) was used.
- the E. co // strain XL1-Blue was used for the in vivo excision.
- the plasmid pBinAR is a derivative of the binary vector plasmid pBin19 (Bevan, 1984, Nucl. Acid Res. 12: 871 1 -8721), which was constructed as follows: A 529 bp fragment which contains the nucleotides 6909-7437 of the 35S promoter of the Cauliflower mosaic virus was isolated as an EcoRI / Kpnl fragment from plasmid pDH51 (Pietrzak et al., 1986) and ligated between the EcoRI and Kpnl sites of the polylinker of pUC18 and was designated plasmid pUC18-35S.
- a 192 bp fragment was isolated from the plasmid pAGV40 (Herrera-Estrella et al., 1983) using the restriction endonucleases Hindill and Pvull, DNA of the Ti plasmid pTiACH ⁇ (Gielen et al, 1984, EMBO J.: 835-846) comprises (nucleotides 1 1749-1 1939). After adding Sphl linkers to the Pvull site, the fragment was ligated between the SpHI and HindIII sites of pUC18-35S and was designated plasmid pA7.
- the DNA was transferred by direct transformation using the Höfgen & Willmitzer method (1988, Nucleic Acids Res. 16: 9877).
- the plasmid DNA of transformed agrobacteria was isolated by the method of Birnboim & Doly (1979, Nucleic Acids Res. 7: 1513-1 523) and analyzed by gel electrophoresis after a suitable restriction cleavage.
- % Bacto agar laid After a week's incubation at 25 ° C. and 3000 lux, the leaves were induction on MS medium with 1.6% glucose, 1.4 mg / l zeatin ribose, 20 mg / l naphthylacetic acid, 20 mg / l giberellic acid, 250 mg / l Claforan, 50 mg / l kanamycin, and 0.80. % Bacto agar laid.
- Potato plants were kept in the greenhouse under the following conditions: light period 16 h at 25000 lux and 22 ° C.
- the radiocative labeling of DNA fragments was carried out using a DNA random primer labeling kit from Boehringer Mannheim (Germany) according to the manufacturer's instructions.
- the starch synthase activity was determined by determining the incorporation of 14 C-glucose from ADP [ 14 C-glucose] into a product insoluble in methanol / KCi as described in Denyer & Smith, 1992, Planta 186: 609-61 7. 8. Detection of soluble starch synthases in the native gel
- tissue samples from potato tubers were disrupted in 50 mM Tris-HCl pH 7.6, 2 mM DTT, 2.5 mM EDTA, 10% glycerol and 0.4 mM PMSF.
- the electrophoresis was carried out in a MiniProtean II chamber (BioRAD).
- the monomer concentration of the 1.5 mm thick gels was 7.5% (w / v), 25 mM Tris-Glycine pH 8.4 served as gel and running buffer. Equal amounts of protein extract were applied and separated for 2 h at 10 mA per gel.
- the activity gels were then incubated in 50 mM Tricine-NaOH pH 8.5, 25 mM potassium acetate, 2 mM EDTA, 2 mM DTT, 1 mM ADP-glucose, 0.1% (w / v) amylopectin and 0. 5 M sodium citrate. Glucans formed were stained with Lugol's solution.
- the starch produced by the transgenic potato plants was as follows
- Starch was isolated from potato plants using standard methods and the amylose to amylopectin ratio according to the method described by Hovenkamp-Hermelink et al. described method (Potato Research 31 (1988) 241 -246).
- glucose units may be phosphorylated at the carbon atoms of positions C2, C3 and C6.
- 100 mg of starch in 1 ml of 0.7 M HCl were hydrolyzed for 4 hours at 95 ° C. (Nielsen et. Al. (1 994) Plant Physiol. 105: 1 1 1 - 1 1 7). After neutralization with 0.7 M KOH, 50 ml of the hydrolyzate were subjected to an optical-enzymatic test to determine glucose-6-phosphate subjected.
- the change in the absorption of the test mixture was followed at 334 nm.
- the total phosphate was determined as described in Arnes, 1996, method in Enzymology VIII, 1 15-1 18.
- the grain size was determined using a "Lumosed" photo sedimentometer from Retsch GmbH, Germany. For this purpose, 0.2 g of starch was suspended in approx. 150 ml of water and measured immediately. The program supplied by the manufacturer calculated the average diameter of the starch granules on the assumption of an average density of the starch of 1.5 g / l.
- the gelatinization or viscosity properties of the starch were recorded with a Viscograph E from Brabender oHG, Germany, or with a Rapid Visco Analyzer, Newport Scientific Pty Ltd, Investment Support Group, Warriewood NSW 2102, Australia.
- a suspension of 30 g starch in 450 ml water was subjected to the following heating program: heat up from 50 ° C to 96 ° C at 3 ° / min., keep constant for 30 minutes, cool down to 30 ° C at 3 ° / min. and keep it constant for another 30 minutes.
- the temperature profile provided characteristic gelatinization properties.
- RVA Rapid Visco Analyzer
- a suspension of 2 g starch in 25 ml water was subjected to the following heating program: suspend for 60 s at 50 ° C, heat from 50 ° C to 95 ° C at 12 ° / min., Keep constant for 2.5 minutes, cool to 50 ° C at 12 ° C / min. and keep it constant for another 2 minutes.
- the RVA temperature profile provided the viscometric parameters of the examined starches for the maximum (Max) and final viscosity (Fin), the gelatinization temperature (T), the minimum viscosity (Min) occurring after the maximum viscosity, and the difference between the minimum and final viscosity (setback, Set) (see Table 1 and Fig. 1).
- Example 1 Isolation of a cDNA fragment coding for ⁇ -amylase from potato
- the KV832 / pACAG transformants were cultured on YT medium (5 g / l NaCl, 8 g / l tryptone, 5 g / l yeast extract) with 1% glucose and 1 mM IPTG at 37 ° C.
- the medium contained 10 mg / l chloramphenicol for selection for the presence of the plasmid pACAG.
- the medium contained 100 mg / l ampicillin for selection for positive transformants.
- Plasmid DNA from clearly weakly stained colonies was prepared according to Birnboim & Doly (1979) and used to transform E. coli DH5 ⁇ (Sambrook et al., 1989, loc.cit.). Plasmid DNA from these transformants was used for DNA sequencing and as Seq. ID # 1 identified.
- the plasmid selected in this way was deposited on July 24, 1998 under the number DSM 12348 at the German Collection for Microorganisms in Braunschweig, FRG, and contains an approximately 1300 bp Asp718 / BamH1 between the CAMV 35S promoter and the ocs terminator Fragment of the as Seq. ID No. 1 shown nucleotide sequence, coding for a ⁇ -amylase from Solanum tuberosum.
- a 2384 bp EcoRI fragment containing a cDNA coding for SS I from Potato, (Abel 1995, loc.cit.) was smoothed and introduced in the vector pBinAR pre-cut with Smal in a “sense” orientation with respect to the 35S promoter.
- a 4212 bp Asp718 / Xbal fragment containing a cDNA coding for the SS III from potato was in "antisense" orientation with respect to the 35S promoter between the Asp718 and the Xbal interface of the vector pBinAR-Hyg introduced.
- a 1650 bp HindIII fragment which contains a partial cDNA coding for the BE enzyme from potato was smoothed and introduced in "antisense" orientation with respect to the B33 promoter into the vector pBinB33 precut with Smal.
- the plasmid obtained was cut open with BamHI.
- a 1362 bp BamHI fragment containing a partial cDNA coding for the SS III enzyme from potato (Abel et al., 1996, loc.cit.), Also in the “antisense” orientation with respect to the B33, Promotors introduced.
- a 2384 bp EcoRI fragment containing a cDNA coding for SS I from potato (Abel, 1995, loc.cit.) was smoothed and inserted into the Smal site of the pBinB33 vector cloned in "antisense" orientation with respect to the B33 promoter.
- a 1362 bp BamHI fragment containing a partial cDNA coding for the SS III from potato (Abel et al., 1996, loc.cit.) was inserted into the BamHI site of the resulting vector also in an "antisense" orientation with respect to the B33 - Promotors introduced.
- Example 12 Introduction of the plasmids into the genome of potato cells
- the plasmids listed in Examples 1 to 11 were transferred individually and / or successively into agrobacteria, with the aid of which the transformation of potato cells was carried out as described above. Whole plants were then regenerated from the transformed plant cells.
- Example 13 Characterization of the physico-chemical properties of the modified starches
- the transgenic potato plants showed a change in the physico-chemical properties of the starches they synthesized.
- the starch formed by these plants differs, for example, from starch synthesized in wild type plants in their phosphate or amylose content, the viscosity or gelatinization properties determined by means of RVA, and their chromatographic behavior.
- This international depository accepts the microorganism designated under I, which it received on 199 8 - 0 7 - 24 (date of first deposit) 1
- microorganism referred to under I was received by this international depository on (date of first deposit) and an application for the conversion of this first deposit into a deposit pursuant to the Budapest Treaty was received on (date of receipt of the request for conversion)
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- Nutrition Science (AREA)
- Cell Biology (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Plant Pathology (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
- Enzymes And Modification Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU54167/99A AU769130B2 (en) | 1998-07-31 | 1999-07-30 | Nucleic acid molecule coding for beta-amylase, plants synthesizing a modified starch, method of production and applications |
CA002338187A CA2338187A1 (en) | 1998-07-31 | 1999-07-30 | Nucleic acid molecule coding for beta-amylase, plants synthesizing a modified starch, method of production and applications |
EP99939781A EP1100939A1 (de) | 1998-07-31 | 1999-07-30 | Nukleinsäuremoleküle kodierend für beta-amylase, pflanzen, die eine modifizierte stärke synthetisieren, herstellungsverfahren und verwendungen |
US09/744,852 US6791010B1 (en) | 1998-07-31 | 1999-07-30 | Nucleic acid molecule coding for beta-amylase, plants synthesizing a modified starch, method of production and applications |
JP2000563808A JP2002523023A (ja) | 1998-07-31 | 1999-07-30 | β−アミラーゼをコードする核酸分子、改質デンプンを合成する植物、その産生方法およびその用途 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19836099A DE19836099A1 (de) | 1998-07-31 | 1998-07-31 | Nukleinsäuremoleküle kodierend für eine ß-Amylase, Pflanzen, die eine modifizierte Stärke synthetisieren, Verfahren zur Herstellung der Pflanzen, ihre Verwendung sowie die modifizierte Stärke |
DE19836099.1 | 1998-07-31 |
Publications (1)
Publication Number | Publication Date |
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WO2000008185A1 true WO2000008185A1 (de) | 2000-02-17 |
Family
ID=7877022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/005523 WO2000008185A1 (de) | 1998-07-31 | 1999-07-30 | Nukleinsäuremoleküle kodierend für beta-amylase, pflanzen, die eine modifizierte stärke synthetisieren, herstellungsverfahren und verwendungen |
Country Status (8)
Country | Link |
---|---|
US (1) | US6791010B1 (de) |
EP (1) | EP1100939A1 (de) |
JP (1) | JP2002523023A (de) |
CN (1) | CN1316005A (de) |
AU (1) | AU769130B2 (de) |
CA (1) | CA2338187A1 (de) |
DE (1) | DE19836099A1 (de) |
WO (1) | WO2000008185A1 (de) |
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EP1100939A1 (de) | 2001-05-23 |
AU769130B2 (en) | 2004-01-15 |
AU5416799A (en) | 2000-02-28 |
JP2002523023A (ja) | 2002-07-30 |
US6791010B1 (en) | 2004-09-14 |
CN1316005A (zh) | 2001-10-03 |
DE19836099A1 (de) | 2000-02-03 |
CA2338187A1 (en) | 2000-02-17 |
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