WO1995004826A1 - Debranching enzymes and dna sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants - Google Patents
Debranching enzymes and dna sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants Download PDFInfo
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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
- C12N9/2451—Glucanases acting on alpha-1,6-glucosidic bonds
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- C—CHEMISTRY; METALLURGY
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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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- the present invention relates to DNA sequences which on the codogenic strand code plant debranching enzymes whose transcripts formed in transgenic plants code new proteins with the enzymatic activity of debranching enzymes which in transgenic plants reduce the degree of branching of amylopectin starch, and to DNA sequences which on the codogenic strand code plant debranching enzymes whose transcripts formed in transgenic plants prevent the synthesis of proteins with the enzymatic activity of debranching enzymes, which in transgenic plants increases the degree of branching of amylopectin starch, and also to recombinant plasmids on which these DNA sequences are localized which can be introduced into plant cells and plants .
- the invention also relates to a process for the production of plants changed by genetic engineering whose amylopectin starch is modified, and to the modified starch obtainable from these plants.
- Polysaccharides such as starch are, alongside oils, fats and proteins, the essential renewable raw materials from plants.
- renewable raw materials A decisive factor which stands in the way of the use of renewable raw materials is the lack of substances which precisely meet the requirements of the chemical industry as regards form, structure, or other physico-chemical parameters.
- polysaccharides this means that for example as many different forms of starch must be provided as possible. This necessitates considering both strongly branched forms which are characterized by a high surface reactivity in their chemical properties, and little- branched types which are distinguished by a high uniformity of structure. Uniformity of structure is an important prerequisite for highly efficient reaction control during chemical syntheses.
- starch is a polymer comprising chemically uniform basic components, the glucose molecules, it is a complex mixture of very different molecule forms which differ in respect of their degree of polymerization and the occurrence of branchings of the glucose chains. Starch is therefore not a uniform raw material.
- amylose starch an essentially unbranched polymer comprising ⁇ -1,4 glycosidically linked glucose molecules
- amylopectin starch which for its part is a complex mixture of differently branched glucose chains .
- the branchings come about through the occurrence of additional ⁇ -1,6 glycosidic linkages.
- starch production such as for example maize or potato
- the two forms of starch occur in a ratio of roughly 25 parts amylose to 75 parts amylopectin.
- plants are needed which for example still contain only the component amylopectin or plants which still contain only the component amylose.
- plants are needed which show forms of amylopectin with differently marked branching. There is thus a great interest in enzymes of the starch metabolism which can modify the degree of branching of the starch molecules, or in gene sequences which can be used for the genetic changing of plants so as to be able to synthesize different forms of starch in plants.
- the mutagenesis technique is not applicable to the agriculturally interesting heterozygotically tetraploid lines, as an inactivation of all copies of a gene is technically not possible because of the presence of four different genotype copies. It is known from Visser et al . (1991, Mol Gen Genet 225:289) that types which form largely pure amylopectin starch can be produced by antisense inhibition of the gene for the starch granule-bound starch synthetase in potato.
- a branching enzyme of the potato is known from WO 92/14827. This enzyme is known as the Q-enzyme of Solanum tuberosum. It is also known that, with the help of DNA sequences which contain the information for the branching enzyme of the potato described in WO 92/14827, transgenic plants can be produced in which the amylose/amylopectin ratio of the starch is changed.
- the pullulanases which besides pullulane also use amylopectin, occur in microorganisms, e.g. Klebsiella, and plants. In plants, they are also called R-enzymes.
- the isoamylases which do not work with pullulane, but do with glycogen and amylopectin, likewise occur in microorganisms and plants.
- An isoamylase of maize is described by Manners & Rowe (1969, Carbohydr. Res. 9: 107) , and Ishizaki et al . (1983, Agric Biol Che 47:771-779) describe an isoamylase of potato.
- the amylo-1, 6-glucosidases are described in mammals and yeasts and use limiting dextrins as substrate.
- the object of the present invention is to provide DNA sequences
- transgenic plants which contain DNA sequences which code proteins with the enzymatic activity of debranching enzymes which reduce the degree of branching of amylopectin starch and transgenic plants which contain DNA sequences which prevent the synthesis of proteins with the enzymatic activity of debranching enzymes, which increases the degree of branching of amylopectin starch.
- proteins with the activity of a debranching enzyme are purified to homogeneity (see example 1) ,
- these peptide sequences are used for the cloning of cDNA sequences from a cDNA library, both immunological and molecular genetic methods being used (see examples 3 and 4) and/or
- DNA sequences from c) and/or d) are introduced into plasmids which make possible a transformation of plant cells and the regeneration of transgenic plants (see example 6) .
- Asp Cys lie Gin Val Gly Met Ala Ala Asn Asp Lys 1 5 10 Seq ID No. 6
- Transgenic plants with an increased or reduced degree of branching of amylopectin starch can be produced via a process which is characterized by the following steps : a) Production of a DNA sequence with the following part- sequences : i) a promoter which is active in plants and ensures the formation of a RNA in proposed target tissues or target cells, ii) a structure DNA sequence which allows the transcription of a RNA which in transgenic plants codes a new protein sequence with the enzymatic activity of a debranching enzyme or which allows the transcription of a RNA which in transgenic plants prevents the synthesis of a protein with the enzymatic activity of a debranching enzyme, iii) if necessary, a 3 ' -non-translated sequence which in plant cells leads to the ending of the transcription and to the addition of poly-A radicals to the 3 '-end of the RNA, b) transfer and incorporation of the structure DNA sequence into the genome of a plant cell, preferably using recombinant
- Recombinant plasmids according to process step b) contain the DNA sequences which on the codogenic strands code plant debranching enzymes or fragments thereof, whereby the transcripts derived from the DNA sequences in transgenic plants effect the synthesis of new proteins with the enzymatic activity of debranching enzymes which in the transgenic plants reduce the degree of branching of amylopectin starch or the transcripts derived from the DNA sequences in transgenic plants prevent the synthesis of endogenous proteins with the enzymatic activity of debranching enzymes, which in transgenic plants increases the degree of branching of amylopectin starch.
- the latter can be achieved through a cosuppression or by anti-sense RNA
- transgenic plants obtainable through the process with an increased or reduced degree of branching of amylopectin starch are also the subject of the invention.
- Plants to which the process is applied are useful plants such as e.g. maize, wheat and potato.
- the invention also relates to proteins having the enzyme activity of a debranching enzyme, one or more of the se ⁇ uences seq ID No. 1 to Seq ID No. 12 and a molecular weight between 50 kd and 150 kd, especially between 70 kd and 130 kd, above all between 90 kd and 110 kd.
- the proteins are from plants, such as Solanu tuberosum.
- protein extracts were obtained from potato plants by way of example.
- a colour test was used for the detection of the enzymatic activity of the debranching enzyme.
- PAAG amylopectin-containing polyacrylamide gels
- amylopectin While unbranched amylose forms a blue-coloured complex with iodine, amylopectin produces a reddish-violet colouring. In amylopectin-containing PAAGs which turn reddish-violet with iodine, there occurs at places at which a debranching activity is localized a colour shift to a blue colouring of the gel, as the branchings of the violet-colouring amylopectin are broken down by the enzyme.
- the protein is purified to homogeneity according to the invention.
- Peptide sequences are determined from the pure protein (see example 2) .
- the peptide sequences of the debranching enzyme show in individual areas a certain homology to microbial debranching enzymes, but this is not true of all domains of the protein.
- the new debranching enzyme from Solanum tuberosum thus represents a previously unknown type of debranching enzymes .
- the peptide sequences of the debranching enzyme serve according to the invention to identify DNA sequences in plants which code a peptide with the activity of a debranching enzyme. Immunological processes can be applied (see example 3) or molecular genetic methods are used (see examples 4 and 5) .
- DNA sequences which code a new debranching enzyme After the DNA sequences which code a new debranching enzyme are identified, they can be multiplied in bacteria by cloning into vector plasmids.
- vectors examples include pBR322, pUC-series, ml3mp-series etc.
- the DNA sequence which codes the new debranching enzyme can be provided with linkers which permit a simple recloning into other plasmids.
- binary plasmids which contain a replication signal for example for Escherichia coli and for Aqrobacterium tumefaciens can be used preferably but not exclusively.
- the cDNA sequence of the new debranching enzyme is fused to a promoter sequence.
- All the promoters which are active in plants come into consideration in principle. Used for preference are promoters which are active in the starch-storing organs of the plants to be transformed. Thus in the case of maize it is the maize granules, whereas in the case of the potato it is the tubers .
- the tuber-specific B33 promoter (Rocha-Sosa et al . , 1989, EMBO J 8:23-29) can be used in particular, but not exclusively, for the transformation of the potato.
- a termination and polyadenylation signal is also appended if necessary to the DNA sequence coding the debranching enzyme .
- This can be for example the termination signal of the octopine synthase gene from A ⁇ robacterium tumefaciens.
- constructs form which are integrated into suitable plasmids for the transformation of plants.
- These recombinant plasmids are also the subject of the present invention.
- the recombinant plasmids are used for the transformation of plant cells from which whole plants can be regenerated. These plant cells which contain the DNA sequences according to the invention are also the subject of the invention.
- the recombinant plasmids can also be used for the identification of nucleic acid sequences which code debranching enzymes.
- RNA which can serve as a matrix for the synthesis of a new debranching enzyme, or which, through interaction with an endogenous mRNA of a debranching enzyme, suppresses its synthesis.
- the type of RNA which is transcribed by the transgene depends on the orientation of the DNA sequence of the new debranching enzyme relative to the promoter.
- a translatable mRNA is formed which serves as a matrix for the synthesis of a protein with the enzymatic activity of a new debranching enzyme. If, on the other hand, the 3' end of the DNA sequence of the new debranching enzyme is fused to the 3' end of the promoter, an antisense RNA forms which suppresses the translatability of the endogenous mRNA of the debranching enzyme . In the first case, there is an additional enzymatic activity of a debranching enzyme in the plant.
- the modified starch formed in the transgenic plants can be isolated from the plants or from the plant .cells with commonly used methods and processed after purification for the production of foodstuffs and industrial products.
- the DNA sequences which code for a debranching enzyme can also be used for the isolation of homologous cDNA or of genomic sequences from other plant species, using standard methods. Description of the figures
- Fig. 1 shows the purification of the debranching enzyme from Solanum tuberosum.
- 0 protein extract of a homogenate of tuber tissue from Solanum tuberosum.
- Passage passage through an affinity chromatography of the protein extract at immobilized ⁇ - cyclodextrin
- ⁇ -cyclo elution of the affinity chromatography dextrin with dissolved ⁇ -cyclodextrin in the concentrations 1 mg/ml and 10 mg/ml respectively.
- DBE debranching enzyme from Solanum tuberosum.
- DE Disproportionating enzyme from Solanum tuberosum.
- Fig. 2 shows the plasmid pB33-R, which is a derivative of the plasmid pBIN19 (Bevan, M., 1984, Nucl Acids Res 12:8711-8721) . In this:
- Dral/Dral fragment (position -1512 to +14) of the promoter region of the B33 gene of Solanum tuberosum (Rocha-Sosa et al . , EMBO J 8:23-29) ,
- nucleotides 11749 to 11939 which was isolated as PvuII/Hindlll fragment from the plasmid pAGV40 (Herrera-Estrella et al . , 1983, Nature 303: 209-213) and cloned after addition of a SphI linker to the PvuII cutting point between the SphI and the Hindi11 cutting points of the polylinker of pBIN 19.
- Fig. 3 shows the plasmid pB33-R-anti, which is a derivative of the plasmid pBIN19 (Sevan, M., 1984, Nucl Acids Res 12:8711-8721) .
- A Dral/Dral fragment (position -1512 to +14) of the promoter region of the B33 gene of Solanum tuberosum (Rocha-Sosa et al . , EMBO J 8:23-29)
- B Notl/NotI fragment of cDNA with the coding region of the debranching enzyme of Solanum tuberosum in anti-sense orientation to Fragment A.
- Protein extracts of plants of the species Solanum tuberosum were obtained from tuber tissue.
- 820 g tuber tissue are homogenized in 1500 ml of a buffer comprising 50 mM sodium acetate pH 6.0; 2.5 mM 1,4-dithio-DL-threitol; 1.5 mM mercaptoethanol; 0.4 mM PMSF and traces of sodium bisulphite, sodium sulphite and ascorbic acid (spatula tips in each case) .
- ⁇ l are separated from the homogenate (see trace 1 in Fig. 1) in a PAAG.
- the gel contains 7.5% acrylamide pH 8.6 which is crosslinked with methylene bisacrylamide up to a degree of 1:75, plus 1% amylopectin.
- the buffer system for the electrophoresis contains tris/glycine pH 8.9.
- the gel is equilibrated in 50 mM tris/citrate pH 7.0; 2 mM ascorbic acid at 22°C for 4 hours.
- the colouring of the gel takes place with Lugol's solution for 15 minutes. The result of the colouring is shown in Fig. 1, trace 1.
- Ammonium sulphate is added, continuously at 4°C with stirring up to a concentration of 40% of the saturation concentration, to a protein extract from tuber tissue of Solanum tuberosum obtained according to example 1.
- the partial precipitation of proteins which sets in is continued with stirring for two hours, then precipitated proteins are separated by centrifugation.
- Ammonium sulphate is added to the supernatant liquid as described above up to a value of 50% of the saturation concentration, proteins again being precipitated out. This protein fraction is separated by centrifugation and then fractionated further. After dissolution of the precipitate in 20 mi acetate buffer (see example 1) and 12 hours' dialysis against double- distilled water, the protein solution is subjected to a chromatography.
- the fraction of the eluate highly enriched with debranching enzyme is subjected to an electrophoresis in a denaturing PAAG in accordance with Laemmli's instructions (1970, Nature 227:680-685) .
- the now denatured protein is cut out from the gel .
- Peptide sequences are determined by standard procedures .
- the peptide sequences of the debranching enzyme from Solanum tuberosum are reproduced in Seq-ID No. 1 to Seq-ID No. 12.
- the protein purified according to example 2 is used for the immunization of rabbits.
- cDNA libraries which are representative of transcripts of the tuber tissue of Solanum tuberosum are screened for cDNA clones which contain sequences which code for the debranching enzyme of Solanum tuberosum.
- total RNA is prepared from tuber tissue of Solanum tuberosum according to Loge ann et al . (1987, Anal Biochem 163:16-20) .
- mRNA polyadenylated by standard methods is prepared from the total RNA, and used according to the procedure described by Gubler & Hoffmann (1983, Gene 25: 263) for the synthesis of cDNA.
- the cDNA is ligated with commercial EcoRI/NotI adapters and then ligated into the EcoRI cutting point of the expression system lambda ZAPII.
- E. coli cells of the strain XLl-Blue are infected and plated out on medium in Petri dishes in a density of 25,000 per ca. 75 cm 2 .
- nitrocellulose filters steeped in 10 mM IPTG solution are laid on the lysated bacteria cultures, and removed after another 3 hours. The filters are used for an immunological sounding by the Western blot technique described in example 5.
- pBluescript plasmids are obtained by in-vivo excision from the phage species obtained after three sounding cycles which contain the cDNA sequence of the debranching enzyme of Solanum tuberosum.
- the sequence of the cDNA is determined using the method of Sanger et al . (1977, Proc Natl Acad Sci USA 74:5463-5467) .
- the insertion can be isolated by cutting with corresponding restriction enzymes from the pBluescript plasmid which contains the sequence of the debranching enzyme of Solanum tuberosum and cloned by standard procedures into binary plasmids with the aim of transforming plants (see example 6) .
- the peptide sequences obtained according to example 2 are used for the derivation of oligonucleotide sequences which, taking account of the degeneracy of the genetic code, reproduce extracts of the DNA sequence of the debranching enzyme of Solanum tuberosum.
- synthetic oligonucleotides are synthesized by standard methods . These are used for the scrutiny of cDNA libraries which are representative for transcripts of the tuber tissue of Solanum tuberosum.
- a cDNA library is produced by preparing total RNA from tuber tissue of Solanum tuberosum according to Logemann et al. (1987, Anal Biochem 163: 16-20) .
- mRNA polyadenylated by standard methods is prepared from the total RNA, and used according to the procedure described by Gubler & Hoffmann (1983, Gene 25: 263) for the synthesis of cDNA.
- the cDNA is ligated with commercial EcoRI/NotI adapters and then ligated into the EcoRI cutting point of the DNA of the phage lambda ZAP II.
- E. coli cells of the strain XLl-Blue are infected and plated out on medium in Petri dishes in a density of 25,000 per ca. 75 cm 2 . After ca.9 hours' incubation, nylon membranes are laid on the lysated bacteria cultures, and removed after 1 minute.
- the filters are incubated for 1 minute in 250 mM HCl, for 5 minutes in 0.5 M NaOH; 1.5 M NaCl, then for 5 minutes in 1 M tris/HCl pH 7.5. After drying and fixing at 80°C for 1 hour, the filters are incubated for 4 hours in a buffer comprising
- T+15 16.6 x [Na+] + 0.41 x % GC 0LIG0NUCLE0TIDE + 81.5 - 675 / len 9 th OLIGONUCLEOTIDE
- Suitable oligonucleotide sequences can be calculated from the peptide sequences reproduced in Seq-ID Nol or Seq-ID No 2 of the debranching enzyme of Solanum tuberosum. In order to obtain as high as possible a hybridization temperature which guarantees an adequate specifity of the hybrid formation, the longest possible oligonucleotides are to be used. But as the length increases, so does the degree of degeneracy, i.e. the number of oligonucleotides with different sequence combinations. Degrees of degeneracy of up to 6000 can be accepted.
- the oligonucleotide probe of length 26 bp was derived.
- the oligonucleotide has a degree of degeneracy of 3072 at a GC content of 61% maximum and 38% minimum. This gives a maximum hybridization temperature of 56°C.
- the basic sequence for the synthesis of the probe reads :
- Peptide Seq-ID No. 1 Asp Ser Asp Asp Val Lys Pro Glu Gly mRNA: 5' GAU UCN GAU GAU GAU GUN AAA CCN GAA GG 3'
- phage species which contain the cDNA sequence of the debranching enzyme of Solanum tuberosum are isolated and used for the in-vivo excision of a pBluescript plasmid by standard methods.
- sequence of the cDNA is determined according to the method of Sanger et al. (1977, Proc Natl Acad Sci 74:5463-5467) .
- the cDNA is isolated by standard methods (Sambrook et al.
- the peptide sequences obtained according to example 2 are used for the derivation of oligonucleotide sequences which, taking account of the degeneracy of the genetic code, reproduce extracts of the DNA sequence of the debranching enzyme of Solanum tuberosum.
- synthetic oligonucleotides are synthesized by standard methods. These are used for the scrutiny of genomic DNA libraries which represent the genome of Solanum tuberosum.
- a genomic DNA library is produced according to Liu et al. (1991, Plant Mol Biol 17:1139-1154) .
- E. coli cells of the strain P 2392 are then infected with the phages containing the genomic DNA fragments and plated out on medium in Petri dishes in a density of 30,000 per cm 2 .
- nitrocellulose membranes are laid onto the lysated bacterial lawn, which are removed after a minute.
- the filters are incubated for 2 minutes in 0.2 M NaOH, 1.5 M NaCl; 2 minutes in 0.4 M tris/ HCl pH 7.5, then for 2 minutes in 2 fold SSC. After drying, the fixing of the DNA takes place via UV crosslinking.
- the filters are then incubated for 3 hours in a buffer comprising
- the temperature for hybridization and washing of the filters is calculated as follows:
- Suitable oligonucleotide sequences can be calculated from the peptide sequences, reproduced in Seq-ID Nol or Seq-ID No 6, of the debranching enzyme of Solanum tuberosum. In order to obtain as high as possible a hybridization temperature which guarantees an adequate specifity of the hybridization, the longest possible oligonucleotides are to be used.
- oligonucleotides can be calculated accordingly and used jointly in an oligonucleotide mixture for hybrid formation. This can increase the efficiency of the hybrid formation.
- the sequence for an oligonucleotide probe of length 26 bp was derived.
- the oligonucleotide has a degree of degeneracy of 3072 at a GC content of 61% maximum and 38% minimum.
- Peptide Se ⁇ ID No. 1 Asp Ser Asp Asp Val Lys Pro Glu Gly mRNA: 5' GAU UCN GAU GAU CUN AAA CCN GAA GG 3' C AG C C G G probe : 3 ' CTA AGN CTA CTA CAN TTT GGN CTT CC 5'
- G TC G G C C Peptide Se ⁇ ID No. 6 He Gin Val Gly Met Ala Ala mRNA: 5' AUU CAA GU- GG- AUG GC- GC 3' C G A probe: 3' TAA GTT CAI CCI TAC CGI CG 5'
- phage species which contain the genomic DNA sequence of the debranching enzyme of Solanum tuberosum are isolated.
- the genomic DNA insertions are isolated from positive clones by suitable restriction enzymes and separated by gel electrophoresis.
- the lambda DNA is separated from the genomic DNA sequence and then isolated by standard methods (Sambrook et al. , 1989, Molecular cloning: a laboratory manual, 2nd Edition, Cold Spring Harbor Laboratory Press, NY USA) , cloned into a pBluescript plasmid and transformed in E coli cells of the strain DH5-ce.
- genomic DNA produced according to example 5 has a length 8 kb to 15 kb on an average, subfragments with a length of 500 bp to 3.5 kb are produced using standard methods by means of suitable restriction enzymes and subcloned into pBluescript plasmids.
- the sequence of the inserted DNA of the different pBluescript plasmids is determined using the method of Sanger et al. (1977, Proc Natl Acad Sci USA, 74:5463-5467) .
- the cDNA which was obtained according to example 3 or 4 as insertion in pBluescript was recloned into a binary vector which is derived from pBIN19
- pB33-R contains, as promoter for the expression of a transgene in plants, the B33 promoter of Solanum tuberosum (Rocha-Sosa et al. , EMBO J 8:23-29) .
- pB33-R contains the cDNA in sense orientation, i.e. leads to the formation of a translatable RNA in transgenic plants
- pB33-R-anti represents an antisense structure for the inhibition of the expression of the endogenous gene.
- the constructs were produced as follows :
- pB33-R the promoter of the B33 gene of Solanum tuberosum was cloned as Dral fragment (position -1512 to +14 according to Rocha-Sosa et al. , EMBO J8:23-39) after degradation of overhanging ends with polymerase II into the SacI cutting point of the plasmid pUC19.
- EcoRI/Smal fragment the promoter region was cloned into the binary vector pBIN19 which contains the termination signal of the octopine synthase gene from Agrobacterium tumefaciens in direct proximity to a polylinker comprising M13mpl9.
- pB33 formed in the process.
- the filled NotI fragment of the cDNA isolated according to example 3 or 4 was cloned into the Smal cutting point of pB33 in sense orientation relative to the promoter (5' end of the cDNA against the 3' end of the promoter) .
- pB33-R formed in the process.
- pB33-R-anti the filled NotI fragment of the cDNA according to example 3 or 4 was cloned into the binary vector pB33 in antisense orientation relative to the promoter (3' end of the cDNA against the 3' end of the promoter) .
- pB33-R-anti formed in the process.
- plasmids were constructed which, instead of the cDNA, contain a genomic DNA sequence which codes for a debranching enzyme from Solanum tuberosum.
- the coding DNA sequences were isolated from the pBluescript plasmids obtained according to example 5 with the help of suitable restriction endonucleases, the overhanging ends were filled and the obtained DNA fragments cloned into the Smal cutting point of pB33 in sense or antisense orientation.
- the binary plasmid is introduced into the cells by direct transformation according to the H ⁇ fgen & Willmitzer method
- the testing of the success of the genetic modification of the plants is possible through analysis of the total RNA as regards the occurrence of a mRNA which codes the debranching enzyme (in the case of the transformation with pB33-R) , or as regards the disappearance of the endogenous mRNA in the case of transformation with pB33-R-anti.
- the isolation of plant total RNA takes place according to Logemann et al . (1987) Anal Biochem 163:16-20.
- 50 ⁇ g each total RNA are checked, with the help of Northern blots, for the presence or absence of the transcript .
- the filter is saturated for 30 minutes with 3% gelatine in TBS buffer (20 mM tris/HCl pH 7.5; 500 mM NaCl) .
- the filter is then incubated for 2 hours with the antiserum in suitable dilution (1:1000-10,000 in TBS buffer) at room temperature.
- the filter is then washed for 15 minutes each with TBS, TTBS
- amylose/amylopectin content in the starch of transgenic potato plants small leaf pieces with a diameter of 10 mm are floated for 14 hours under continuous light on 6% sucrose solution. A markedly increased starch formation in the small leaf pieces is induced by this light incubation. After the incubation, the amylose and amylopectin concentration is determined according to Hovenkamp-Hermelink et al . (1988, Potato Research 31:241-246) . The determination of the degree of branching ( ⁇ -1,6 glycosidic bonds), of the chain length and of the size of the starch granules takes place according to Morrison et al . (1990, Methods in Plant Biochemistry Academic Press Lmtd. 2:323-352) .
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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AU75352/94A AU693469B2 (en) | 1993-08-09 | 1994-08-08 | Debranching enzymes and DNA sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
JP7506224A JPH09501052A (en) | 1993-08-09 | 1994-08-08 | Debranching enzyme suitable for altering the degree of branching of amylopectin starch in plants and DNA sequence encoding the same |
PCT/EP1994/002623 WO1995004826A1 (en) | 1993-08-09 | 1994-08-08 | Debranching enzymes and dna sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
US08/596,257 US6001628A (en) | 1993-08-09 | 1994-08-08 | Debranching enzymes and DNA sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
EP94925439A EP0713531A1 (en) | 1993-08-09 | 1994-08-08 | Debranching enzymes and dna sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
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DE4327165A DE4327165A1 (en) | 1993-08-09 | 1993-08-09 | New de:branching enzyme and DNA |
DEP4327165.0 | 1993-08-09 | ||
PCT/EP1994/002623 WO1995004826A1 (en) | 1993-08-09 | 1994-08-08 | Debranching enzymes and dna sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
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US09/370,644 Division US6433253B1 (en) | 1993-08-09 | 1999-08-06 | Debranching enzymes and DNA sequences coding them, suitable for changing the degree of branching of amylopectin starch in plants |
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