EP1448779A1 - Gene die für glucose-6-phosphat-dehydrogenase proteine codieren - Google Patents
Gene die für glucose-6-phosphat-dehydrogenase proteine codierenInfo
- Publication number
- EP1448779A1 EP1448779A1 EP02779545A EP02779545A EP1448779A1 EP 1448779 A1 EP1448779 A1 EP 1448779A1 EP 02779545 A EP02779545 A EP 02779545A EP 02779545 A EP02779545 A EP 02779545A EP 1448779 A1 EP1448779 A1 EP 1448779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nucleic acid
- g6pd
- protein
- amino acid
- cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- MWOOGOJBHIARFG-UHFFFAOYSA-N vanillin Chemical compound COC1=CC(C=O)=CC=C1O MWOOGOJBHIARFG-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0006—Oxidoreductases (1.) acting on CH-OH groups as donors (1.1)
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
Definitions
- This invention provides novel nucleic acid molecules that can be used to identify or classify Corynebacterium glutamicum or related types of bacteria.
- C. glutamicum is a gram-positive, aerobic bacterium that is commonly used in industry for the large-scale production of a number of fine chemicals, and also for the degradation of hydrocarbons (for example, when overflowing crude oil) and for the oxidation of terpenoids .
- the nucleic acid molecules can therefore be used to identify microorganisms that can be used for the production of fine chemicals, for example by fermentation processes.
- Corynebacterium diphtheriae the causative agent of diphtheria
- the ability to identify the presence of Corynebacterium species can therefore also be of significant clinical importance, for example in diagnostic applications.
- These nucleic acid molecules can also serve as reference points for mapping the C. glutamicum genome or organisms related to genomes. These new nucleic acid molecules encode proteins called glucose-6-phosphate dehydrogenase.
- Glucose-6-phosphate dehydrogenase genes from Corynebacteria are described, for example, in EP 1108790A2. However, the genes described therein code for polypeptide sequences that are shorter than those described here according to the invention. The glucose-6-phosphate dehydrogenase described in EP 1108790A2 is shortened at the N-terminus by 30 amino acids compared to the polypeptide sequence claimed here.
- the invention relates to new genes for glucose-6-phosphate dehydrogenase which are linked to the amino acid in position 1 or 2, i.e. Val or Ser, start and code at position 243 a proteinogenic amino acid that is not Ala (numbering based on SEQ ID NO: 2).
- New genes for glucose-6-phosphate are particularly preferred.
- the nucleic acid molecules according to the invention can be used for the genetic manipulation of an organism in order to make it better and more efficient as a producer of one or more fine chemicals.
- the molecules of the invention can be modified so that the yield, production and / or efficiency of production of one or more fine chemicals is improved.
- the molecules of the invention may also participate in one or more intracellular signal transduction pathways that affect the yields and / or the rate of production of one or more fine chemicals from C. glutamicum.
- Proteins that are necessary, for example, for the import of one or more sugars from the extracellular medium are produced in the cell if there is a sufficient amount of sugar often modified post-translationally so that they can no longer import this sugar.
- the amount of sugar at which the transport Switching off the system is sufficient to maintain normal cell functions, but it limits the overproduction of the desired fine chemical. It is therefore advisable to modify the proteins according to the invention so that they no longer respond to such a negative regulation. This allows higher intracellular concentrations of one or more sugars and, by extension, more efficient production or higher yields of one or more fine chemicals from organisms that contain these mutant proteins.
- nucleic acid sequences of the sequence listing together with the sequence changes at the respective position described in Table 1 are defined as Appendix A.
- the isolated nucleic acid molecule is at least 15 nucleotides long and hybridizes under stringent conditions to a nucleic acid molecule which comprises a nucleotide sequence from Appendix A.
- the isolated nucleic acid molecule preferably corresponds to a naturally occurring nucleic acid molecule.
- the isolated nucleic acid more preferably encodes a naturally occurring C. g2ufcamicum G6PD protein or a biologically active portion thereof.
- Another aspect of the invention relates to vectors, for example recombinant expression vectors, which contain the nucleic acid molecules according to the invention, and host cells, into which these vectors have been introduced.
- a host cell is used to produce a G6PD protein, which is grown in a suitable medium.
- the G6PD protein can then be isolated from the medium or the host cell.
- Another aspect of the invention relates to a genetically modified microorganism in which a G6PD gene has been introduced or modified.
- the genome of the microorganism has been changed by introducing at least one nucleic acid molecule according to the invention which codes the mutated G6PD sequence as a transgene.
- an endogenous G6PD gene in the genome of the microorganism has been changed, for example functionally disrupted, by homologous recombination with an altered G6PD gene.
- the microorganism belongs to the genus Corynebacterium or Brevibacterium, Corynebacterium glutamicum being particularly preferred.
- the microorganism is preferred embodiment also used to produce a desired compound, such as an amino acid, particularly preferably ysin.
- host cells that have more than one of the nucleic acid molecules described in Appendix A.
- Such host cells can be produced in various ways known to those skilled in the art. For example, they can be transfected by vectors which carry several of the nucleic acid molecules according to the invention. However, it is also possible to use one vector to introduce a nucleic acid molecule according to the invention into the host cell and therefore to use several vectors either simultaneously or in a staggered manner. Host cells can thus be constructed which carry numerous up to several hundred of the nucleic acid sequences according to the invention. Such an accumulation can often achieve superadditive effects on the host cell with regard to fine chemical productivity.
- an isolated G6PD protein or a section for example a biologically active section thereof.
- the isolated G6PD protein or its section can be involved in the import of high-energy carbon molecules (for example glucose, fructose or sucrose) into C. glutamicum and also be involved in one or more intracellular signal transduction pathways of C. glutamicum.
- the isolated G6PD protein or a portion thereof is sufficiently homologous to an amino acid sequence from Appendix B, so that the protein or its portion continues to import high-energy carbon molecules (e.g. glucose, fructose or sucrose) into C. can participate in one or more intracellular signal transduction pathways of C. glutamicum.
- the invention also relates to an isolated Glu-6-phosphate dehydrogenase protein preparation.
- the Glu-6-phosphate dehydrogenase G6PD protein comprises an amino acid sequence from Appendix B.
- the invention relates to an isolated full-length protein which forms a complete amino acid sequence from Appendix B (which is from an open reading frame in Appendix A is encoded) is essentially homologous.
- Another aspect of the invention relates to a method for producing a fine chemical.
- the method provides for the cultivation of a cell which contains a vector which brings about the expression of a nucleic acid molecule according to the invention, so that a Fine chemical is produced.
- this method also comprises the step of obtaining a cell which contains such a vector, the cell being transfected with a vector which brings about the expression of a nucleic acid.
- this method also comprises the step in which the fine chemical is obtained from the culture.
- the cell belongs to the genus Corynebacterium or Breviba ct eri.
- fine chemical is known in the art and includes molecules that are produced by an organism and have applications in various industries, such as, but not limited to, the pharmaceutical, agricultural, and cosmetic industries. These compounds include organic acids such as tartaric acid, itaconic acid and diamino-pimelic acid, both proteinogenic and non-proteinogenic amino acids, purine and pyrimidine bases, nucleosides and nucleotides (as described, for example, in Kuninaka, A. (1996) Nucleotides and related compounds, Pp. 561-612, in Biotechnology Vol. 6, Rehm et al., Ed. VCH: Weinheim and the citations contained therein), lipids, saturated and unsaturated fatty acids (e.g.
- arachidonic acid arachidonic acid
- diols e.g. propanediol and butanediol
- Carbohydrates e.g. hyaluronic acid and trehalose
- aromatic compounds e.g. aromatic amines, vanillin and indigo
- vitamins and cofactors as described in Ulimann's Encyclopedia of Industrial Kitchen, Vol. A27, "Vitamins", p. 443-613 (1996) VCH: Weinheim and the citations contained therein; and Ong, AS, Niki, E. and Packer, L.
- amino acids comprise the basic structural units of all proteins and are therefore essential for normal cell functions.
- amino acid is known in the art.
- the proteinogenic amino acids of which there are 20 types, serve as structural units for proteins in which they are linked to one another via peptide bonds, whereas the non-proteinogenic amino acids (of which hundreds are known) are usually not found in proteins (see Ulimann's Encyclopedia of Industrial Chemistry, vol. A2, p 57-97 VCH: Weinheim (1985)).
- the amino acids can be in the D or L configuration, although L-amino acids are usually the only type found in naturally occurring proteins.
- Biosynthetic and degradation pathways of each of the 20 proteinogenic amino acids are well characterized in both prokaryotic and eukaryotic cells (see, for example, Stryer, L. Biochemistry, 3rd edition, pp. 578-590 (1988)).
- the "essential" amino acids histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine
- the "essential” amino acids are converted into the remaining 11 by simple biosynthetic pathways
- "Nonessential” amino acids alanine, arginine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine and tyrosine
- Higher animals have the ability to synthesize some of these amino acids, but the essential amino acids must be ingested with food for normal protein synthesis to take place.
- Lysine is not only an important amino acid for human nutrition, but also for monogastric animals such as poultry and pigs.
- Glutamate is most commonly used as a flavor additive (monosodium glutamate, MSG) and is widely used in the food industry, as well as aspartate, phenylalanine, glycine and cysteine.
- Glycine, L-methionine and tryptophan are all used in the pharmaceutical industry.
- Leucine, isoleucine, histidine, arginine, proline, serine and alanine are used in the pharmaceutical and cosmetic industries. Threonine, tryptophan and D- / L-methionine are widespread feed additives (Leuchtenberger, W. (1996) Amino acids - technical production and use, pp. 466-502 in Rehm et al., (Ed.) Biotechnology Vol. 6, chapter 14a, VCH: Weinheim).
- amino acids are also used as precursors for the synthesis of synthetic amino acids and proteins such as N-acetylcysteine, S-carboxymethyl-L-cysteine, (S) -5-hydroxytryptophan and others, in Ulimann's Encyclopedia of Industrial Chemistry, Vol. A2, pp. 57-97, VCH, Weinheim, 1985 are suitable substances.
- Cysteine and glycine are each produced from serine, the former by condensation of homocysteine with serine, and the latter by transferring the side chain ⁇ -carbon atom to tetrahydrofolate, in a reaction catalyzed by serine transhydroxymethylase.
- Phenylalanine and tyrosine are synthesized from the precursors of the glycolysis and pentose phosphate pathways, erythrose-4-phosphate and phosphoenolpyruvate in a 9-step biosynthetic pathway that differs only in the last two steps after the synthesis of prephenate. Tryptophan is also produced from these two starting molecules, but its synthesis takes place in an 11-step process.
- Tyrosine can also be produced from phenylalanine in a reaction catalyzed by phenylalanine hydroxylase.
- Alanine, valine and leucine are each biosynthetic products from pyruvate, the end product of glycolysis.
- Aspartate is made from oxaloacetate, an intermediate of the citrate cycle.
- Asparagine, methionine, threonine and lysine are each produced by converting aspartate.
- Isoleucine is made from threonine.
- histidine is formed from 5-phosphoribosyl-1-pyrophosphate, an activated sugar.
- Amino acids the amount of which exceeds the cell's protein biosynthesis requirement, cannot be stored and are instead broken down, so that intermediates are provided for the main metabolic pathways of the cell (for an overview see Stryer, L., Biochemistry, 3rd ed. Chapter 21 "Amino Acid Degradation and the Urea Cycle”; S 495-516 (1988)).
- the cell is able to convert undesired amino acids into useful metabolic intermediates, the production of amino acids is expensive in terms of energy, precursor molecules and the enzymes required for their synthesis.
- amino acid biosynthesis is regulated by feedback inhibition, the presence of a particular amino acid slowing or stopping its own production (for an overview of the feedback mechanism in amino acid biosynthetic pathways, see Stryer, L., Biochemistry, 3rd ed., chapter 24, "Biosynthesis of Amino Acids and Heme ", pp. 575-600 (1988)).
- the output of a certain amino acid is therefore restricted by the amount of this amino acid in the cell.
- Vitamins, cofactors and nutraceuticals comprise another group of molecules. Higher animals have lost the ability to synthesize them and must therefore absorb them, although they are easily synthesized by other organisms such as bacteria. These molecules are either biologically active molecules per se or precursors of biologically active substances that serve as electron carriers or intermediates in a number of metabolic pathways. In addition to their nutritional value, these compounds also have a significant industrial value as dyes, antioxidants and catalysts or other processing aids. (For an overview of the structure, activity and the industrial applications of these compounds, see, for example, Ullmann's Encyclopedia of Industrial Chemistry, "Vitamins", Vol. A27, pp. 443-613, VCH: Weinheim, 1996).
- vitamin is known in the art and encompasses nutrients which are required by an organism for normal function, but which cannot be synthesized by this organism itself.
- the group of vitamins can include cofactors and nutraceutical compounds.
- cofactor includes non-proteinaceous compounds that are necessary for normal enzyme activity to occur. These compounds can be organic or inorganic; the cofactor molecules according to the invention are preferably organic.
- nutraceutical encompasses food additives which are beneficial to plants and animals, in particular humans. Examples of such molecules are vitamins, antioxidants and also certain lipids (e.g. polyunsaturated fatty acids).
- Thiamine (vitamin Bi) is formed by chemical coupling of pyrimidine and thiazole units.
- Riboflavin (vitamin B) is synthesized from guanosine 5 'triphosphate (GTP) and ribose 5' phosphate. Riboflavin in turn is used to synthesize flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD).
- the family of compounds commonly referred to as "Vitamin B6" e.g. pyridoxine, pyridoxamine, pyridoxal 5 'phosphate and the commercially used pyridoxine hydrochloride
- Vitamin B6 e.g. pyridoxine, pyridoxamine, pyridoxal 5 'phosphate and the commercially used pyridoxine hydrochloride
- Panthothenate (pantothenic acid, R- (+) -N- (2, 4-dihydroxy-3, 3-dimethyl-l-oxobutyl) -ß-alanine) can be produced either by chemical synthesis or by fermentation.
- the final steps in pantothenate biosynthesis consist of the ATP-driven condensation of ß-alanine and pantoic acid.
- the enzymes responsible for the biosynthetic steps for the conversion into pantoic acid, into ß-alanine and for the condensation into pantothenic acid are known.
- the metabolically active form of pantothenate is coenzyme A, whose biosynthesis takes place over 5 enzymatic steps.
- Pantothenate pyridoxal-5 '-phosphate, cysteine and ATP are the precursors of coenzyme A. These enzymes not only catalyze the formation of pantothenate, but also the production of (R) -pantoic acid, (R) -pantolactone, (R) - Panthenol (provitamin B 5 ), Pantethein (and its derivatives) and coenzyme A.
- Lipoic acid is derived from octanoic acid and serves as a coenzyme in energy metabolism, where it becomes part of the pyruvate dehydrogenase complex and the ⁇ -ketoglutarate dehydrogenase complex.
- the folates are a group of substances that are all derived from folic acid, which in turn is derived from L-glutamic acid, p-aminobenzoic acid and 6-methylpterine.
- guanosine 5'-triphosphate GTP
- L-glutamic acid L-glutamic acid
- p-aminobenzoic acid The biosynthesis of folic acid and its derivatives, starting from the metabolic intermediates guanosine 5'-triphosphate (GTP), L-glutamic acid and p-aminobenzoic acid, has been extensively investigated in certain microorganisms.
- Corrinoids such as the cobalamins and especially vitamin B ⁇ 2
- the porphyrins belong to a group of chemicals that are characterized by a tetrapyrrole ring system.
- the biosynthesis of Vitamin B ⁇ is sufficiently complex that it has not been fully characterized, but a large part of the enzymes and substrates involved is now known.
- Nicotinic acid (nicotinate) and nicotinamide are pyridine derivatives, which are also called “niacin”.
- Niacin is the precursor of the important coenzymes NAD (nicotinamide adenine dinucleotide) and NADP (nicotinamide adenine dinucleotide phosphate) and their reduced forms.
- purine and pyrimidine metabolism and their corresponding proteins are important targets for the therapy of tumor diseases and viral infections.
- purine or pyrimidine encompasses nitrogen-containing bases which are part of the nucleic acids, coenzymes and nucleotides.
- Nucleotide contains the basic structural units of the nucleic acid molecules, which include a nitrogenous base, a penose sugar (for RNA, the sugar is ribose, for DNA, the sugar is D-deoxyribose) and phosphoric acid.
- the term “nucleoside” encompasses molecules which serve as precursors of nucleotides, but which, in contrast to the nucleotides, have no phosphoric acid unit.
- nucleotides that do not form nucleic acid molecules, but that serve as energy stores (i.e. AMP) or as coenzymes (i.e. FAD and NAD).
- nucleotides also have other possible uses: as intermediates in the biosynthesis of various fine chemicals (eg thiamine, S-adenosyl-methionine, folate or riboflavin), as energy sources for the cell (eg ATP or GTP) and for chemicals themselves, are becoming common used as a flavor enhancer (for example IMP or GMP) or for many medical applications (see for example Kuninaka, A., (1996) "Nucleotides and Related Compounds in Biotechnology Vol. 6, Rehm et al., ed. VCH: Weinheim, S 561-612).
- Enzymes involved in purine, pyrimidine, nucleoside or nucleotide metabolism are also increasingly becoming targets against which crop protection chemicals, including fungicides, herbicides and insecticides, are being developed.
- the purine nucleotides are synthesized from ribose 5-phosphate via a series of steps via the intermediate compound inosine 5 'phosphate (IMP), which leads to the production of guanosine 5' monophosphate (GMP) or adenosine 5 'monophosphate (AMP ) leads from which the triphosphate forms used as nucleotides can be easily produced. These compounds are also used as energy stores, so that their degradation provides energy for many different biochemical processes in the cell. Pyrimidine biosynthesis takes place via the formation of uridine 5 'monophosphate (UMP) from ribose 5-phosphate. UMP in turn is converted to cytidine 5 'triphosphate (CTP).
- IMP intermediate compound inosine 5 'phosphate
- AMP adenosine 5 'monophosphate
- the deoxy forms of all nucleotides are produced in a one-step reduction reaction from the diphosphate ribose form of the nucleotide to the diphosphate deoxyribose form of the nucleotide. After Phosphorylation, these molecules can participate in DNA synthesis.
- Trehalose consists of two glucose molecules that are linked by an ⁇ , ⁇ -l, l bond. It is commonly used in the food industry as a sweetener, as an additive for dried or frozen foods, and in beverages. However, it is also used in the pharmaceutical, cosmetics and biotechnology industries (see, e.g., Nishimoto et al., (1998) US Patent No. 5,759,610; Singer, MA and Lindquist, S. Trends Biotech. 16 (1998) 460-467; Paiva, CLA and Panek, AD Biotech Ann. Rev. 2 (1996) 293-314; and Shiosaka, MJ Japan 172 (1997) 97-102). Trehalose is produced by enzymes from many microorganisms and is naturally released into the surrounding medium from which it can be obtained by methods known in the art.
- the present invention is based at least in part on the discovery of new molecules, which are referred to here as G6PD nucleic acid and protein molecules and which are involved in the absorption of high-energy carbon molecules (eg glucose, sucrose and fructose) in C. glutamicum and can also be involved in one or more intracellular signal transduction pathways in these microorganisms.
- the G6PD molecules import high-energy carbon molecules into the cell, where the energy generated by their degradation is used to drive less energetic biochemical reactions. Your breakdown products can be used as intermediates or precursors for a number of other metabolic pathways.
- the G6PD molecules can participate in one or more intracellular signal transduction pathways, and the presence of a modified form of a G6PD molecule (e.g., a phosphorylated G6PD protein) can participate in a signal transduction cascade that regulates one or more cellular processes.
- a modified form of a G6PD molecule e.g., a phosphorylated G6PD protein
- the activity of the G6PD molecules according to the invention has an effect on the production of a desired fine chemical by this organism.
- the G6PD molecules according to the invention have a modulated activity, so that the yield, production or efficiency in the production of one or more fine chemicals from C. glutamicum are also modulated.
- the G6PD molecules according to the invention are capable of modulating the production of a desired molecule, such as a fine chemical, in a microorganism, such as C. glutamicum.
- a desired molecule such as a fine chemical
- a microorganism such as C. glutamicum.
- one or more G6PD proteins according to the invention can be manipulated in such a way that their function is modulated. For example.
- a protein involved in the G6PD-mediated import of glucose can be altered to have optimal activity, and the G6PD system for the import of glucose can thus deliver large amounts of glucose into the cell.
- Glucose molecules are not only used as an energy source for energetically unfavorable biochemical reactions, such as the biosynthesis of fine chemicals, but also as precursors and intermediates in a number of fine chemical biosynthetic pathways (e.g. serine is synthesized from 3-phosphoglycerate).
- the overall yield or rate of production of any of these desired fine chemicals can be increased by increasing the energy available for this production to take place or by increasing the availability of the compounds necessary for this production to take place.
- the genome of a Corynebacterium glutamicum strain which is available from the American Type Culture Collection under the name ATCC 13032, is suitable as a starting point for the production of the nucleic acid sequences according to the invention.
- nucleic acid sequences according to the invention can be produced from these nucleic acid sequences by conventional methods using the changes described in Table 1.
- the G6PD protein according to the invention or a biologically active section or fragments thereof can be involved in the transport of high-energy carbon-containing molecules, such as glucose, in C. glutamicum or in an intracellular signal transduction in this microorganism, or one or more of those in Table 1 activities listed.
- One aspect of the invention relates to isolated nucleic acid molecules which encode G6PD polypeptides or biologically active sections thereof, and to nucleic acid fragments which are for use as
- Hybridization probes or primers for the identification or amplification of G6PD-coding nucleic acids pass.
- nucleic acid molecule is intended to encompass DNA molecules (for example cDNA or genomic DNA) and RNA molecules (for example RNA) as well as DNA or RNA analogs which are generated by means of nucleotide analogs. This term also includes the untranslated sequence located at the 3 'and 5' ends of the coding region: at least about 100 nucleotides of the sequence upstream of the 5 'end of the coding region and at least about' 20 nucleotides of the sequence downstream of the 3 '- End of the coding gene region.
- the nucleic acid molecule can be single-stranded or double-stranded, but is preferably a double-stranded DNA.
- An "isolated" nucleic acid molecule is separated from other nucleic acid molecules that are present in the natural source of the nucleic acid.
- An “isolated” nucleic acid preferably has no sequences which naturally flank the nucleic acid in the genomic DNA of the organism from which the nucleic acid originates (for example sequences which are located at the 5 'or 3' end of the nucleic acid).
- the isolated G6PD nucleic acid molecule can contain less than about 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb or 0.1 kb of the nucleotide sequences that naturally comprise the nucleic acid molecule in the genomic DNA of the Flank the cell from which the nucleic acid originates (for example a C. glutamicum cell).
- An "isolated" nucleic acid molecule, such as a cDNA molecule may also be substantially free of any other cellular material or culture medium when made by recombinant techniques, or free of chemical precursors or other chemicals if it is chemically synthesized.
- a nucleic acid molecule according to the invention for example a nucleic acid molecule with a nucleotide sequence from Appendix A or a section thereof, can be produced using standard molecular biological techniques and the sequence information provided here.
- a C. glutamicum G6PD cDNA can be isolated from a C. gluta icum bank by using a complete sequence from Appendix A or a section thereof as a hybridization probe and standard hybridization techniques (as described, for example, in Sambrook, J ., Fritsch, EF and Maniatis, T. Molecular Cloning: A Laboratory Manual, 2nd Edition Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989).
- a nucleic acid molecule comprising a complete sequence from Annex A or a section thereof can be isolated by polymerase chain reaction, using the oligonucleotide primers which have been created on the basis of this sequence (for example a nucleic acid molecule comprising a complete sequence can be used Appendix A, or a portion thereof, can be isolated by polymerase chain reaction using oligonucleotide primers based on the Based on this same sequence from Appendix A).
- mRNA can be isolated from normal endothelial cells (for example by the guanidinium thiocyanate extraction method of Chirgwin et al.
- cDNA can be converted using reverse transcriptase (for example Moloney-MLV reverse transcriptase, available from Gibco / BRL, Bethesda, MD, or AMV reverse transcriptase, available from Seikagaku America, Inc., St. Russia, FL).
- reverse transcriptase for example Moloney-MLV reverse transcriptase, available from Gibco / BRL, Bethesda, MD, or AMV reverse transcriptase, available from Seikagaku America, Inc., St. Russia, FL.
- Synthetic oligonucleotide primers for the amplification via polymerase chain reaction can be created on the basis of one of the nucleotide sequences shown in Appendix A.
- a nucleic acid according to the invention can be amplified using cDNA or alternatively genomic DNA as a template and suitable oligonucleotide primers according to standard PCR amplification techniques.
- the nucleic acid amplified in this way can be cloned into a suitable vector and characterized by DNA sequence analysis.
- Oligonucleotides which correspond to a G6PD nucleotide sequence can be produced by standard synthesis methods, for example using an automatic DNA synthesizer.
- an isolated nucleic acid molecule according to the invention comprises one of the nucleotide sequences listed in Appendix A.
- an isolated nucleic acid molecule according to the invention comprises a nucleic acid molecule which is complementary to one of the nucleotide sequences shown in Appendix A or a portion thereof, which is a nucleic acid molecule which is sufficiently complementary to one of the nucleotide sequences shown in Appendix A. it can hybridize to one of the sequences given in Appendix A, creating a stable duplex.
- the nucleic acid molecule according to the invention encodes a protein or a section thereof, the one
- high-energy carbon molecules such as glucose
- the term "sufficiently homologous" refers to proteins or portions thereof whose amino acid sequences have a minimal number of identical or equivalent amino acid residues (for example an amino acid residue with a side chain similar to an amino acid residue in one of the sequences from Appendix B) to an amino acid sequence from Appendix B, so that the protein or a portion thereof contains high-energy carbon cool, such as glucose, can be transported in C.
- G6PD protein thus relates to the complete functioning and / or the regulation of one or more sugar transport routes based on phosphoenolpyruvate. Table 1 shows examples of G6PD protein activities.
- Sections of proteins which are encoded by the G6PD nucleic acid molecules according to the invention are preferably biologically active sections of one of the G6PD proteins.
- biologically active portion of a G6PD protein is intended to include a portion, e.g., a domain or motif, of a G6PD protein that contains high-energy carbon-containing molecules such as glucose in C. glutamicum can transport, or can be involved in the intracellular signal transduction in this microorganism, or has an activity given in Table 1.
- a test of the enzymatic activity can be carried out. These test methods, as described in detail in Example 8 of the example part, are familiar to the person skilled in the art.
- nucleotide sequence of Appendix A which leads to a change in the amino acid sequence of the encoded G6PD protein without affecting the functionality of the G6PD protein.
- nucleotide substitutions which lead to amino acid substitutions at "non-essential" amino acid residues can be produced in a sequence from Appendix A.
- a "non-essential" amino acid residue in a wild-type sequence can be changed by one of the G6PD proteins (Appendix B) without changing the activity of the G6PD protein, whereas an "essential" amino acid residue is required for the G6PD protein activity ,
- other amino acid residues e.g. non-conserved or only semi-preserved amino acid residues in the domain with G6PD activity
- An isolated nucleic acid molecule encoding a G6PD protein that is homologous to a protein sequence from Appendix B can be generated by incorporating one or more nucleotide substitutions, additions or deletions into a nucleotide sequence from Appendix A so that one or more Amino acid substitutions, additions or deletions can be introduced into the encoded protein.
- the mutations can be introduced into one of the sequences from Appendix A by standard techniques such as site-directed mutagenesis and PCR-mediated mutagenesis.
- conservative amino acid substitutions are introduced on one or more of the predicted non-essential amino acid residues.
- the amino acid residue is replaced by an amino acid residue with a similar side chain.
- Families of amino acid residues with similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g. lysine, arginine, histidine), acidic side chains (e.g. aspartic acid, glutamic acid), uncharged polar side chains (e.g.
- glycine asparagine, glutamine, serine, threonine, tyrosine, cysteine
- non-polar Side chains for example alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan
- beta-branched side chains for example threonine, valine, isoleucine
- aromatic side chains for example tyrosine, phenylalanine, tryptophan, histidine.
- a predicted non-essential amino acid residue in a G6PD protein is thus preferably replaced by another amino acid residue of the same side chain family.
- the mutations can alternatively be introduced randomly over all or part of the G6PD coding sequence, for example by saturation mutagenesis, and the resulting mutants can be examined for the G6PD activity described here in order to identify mutants, that maintain G6PD activity.
- the encoded protein can be expressed in a recombinant manner, and the activity of the protein can be determined, for example, using the tests described here (see Example 8 of the example part).
- vectors preferably expression vectors, containing a nucleic acid encoding a G6PD protein (or a portion thereof).
- vector refers to a nucleic acid molecule that can transport another nucleic acid to which it is is bound.
- plasmid which is a circular double-stranded DNA loop into which additional DNA segments can be ligated.
- viral vector Another type of vector is a viral vector, whereby additional DNA segments can be ligated into the viral genome.
- Certain vectors can replicate autonomously in a host cell into which they have been introduced (for example, bacterial vectors with a bacterial origin of replication and episomal mammalian vectors).
- vectors eg non-episomal mammalian vectors
- Other vectors are integrated into the genome of a host cell when introduced into the host cell and thereby replicated together with the host genome.
- certain vectors can control the expression of genes to which they are operably linked. These vectors are called "expression vectors".
- the expression vectors used in recombinant DNA techniques are usually in the form of plasmids.
- plasmid and vector can be used interchangeably because the plasmid is the most commonly used vector form.
- the invention is intended to encompass these other expression vector forms, such as viral vectors (e.g. replication-deficient retroviruses, adenoviruses and adeno-related viruses), which perform similar functions.
- the recombinant expression vector according to the invention comprises a nucleic acid according to the invention in a form which is suitable for the expression of the nucleic acid in a host cell, which means that the recombinant expression vectors one or more regulatory sequences, selected on the basis of the host cells to be used for expression, the is operably linked to the nucleic acid sequence to be expressed.
- “operably linked” means that the nucleotide sequence of interest is bound to the regulatory sequence (s) in such a way that expression of the nucleotide sequence is possible (for example in an in vitro transcription / Translation system or in a host cell if the vector is introduced into the host cell).
- regulatory sequence is intended to encompass promoters, enhancers and other expression control elements (for example polyadenylation signals). These regulatory sequences are described, for example, in Goeddel: Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, CA (1990). Regulatory sequences include those that control the constitutive expression of a nucleotide sequence in many host cell types and those that control the direct expression of the nucleotide sequence only in certain host cells. The person skilled in the art is aware that the design of an expression vector can depend on factors such as the choice of the host cell to be transformed, the extent of expression of the desired protein, etc.
- Vectors can be introduced into the host cells so as to produce proteins or peptides, including fusion proteins or peptides, encoded by the nucleic acids as described herein (e.g. G6PD proteins, mutant forms of G6PD proteins, fusion proteins , etc.).
- proteins or peptides including fusion proteins or peptides, encoded by the nucleic acids as described herein (e.g. G6PD proteins, mutant forms of G6PD proteins, fusion proteins , etc.).
- the recombinant expression vectors according to the invention can be designed for the expression of G6PD proteins in prokaryotic or eukaryotic cells.
- G6PD genes can be found in bacterial cells such as C. glutamicum, insect cells (with baculovirus expression vectors), yeast and other fungal cells (see Romanos, MA et al. (1992) "Foreign gene expression in yeast: a review", Yeast 8: 423-488; van den Hondel, CAMJJ et al. (1991) "Heterologous gene expression in filamentous fungi” in: More Gene Manipulations in Fungi, JW Bennet & LL Lasure,
- the recombinant expression vector can be transcribed and translated in vitro, for example using T7 promoter regulatory sequences and T7 polymerase.
- Proteins are usually expressed in prokaryotes using vectors which contain constitutive or inducible promoters which control the expression of fusion or non-fusion proteins.
- Fusion vectors contribute a number of amino acids to a protein encoded therein, usually at the amino terminus of the recombinant protein. These fusion vectors usually have three functions: 1) to increase the expression of recombinant. Protein; 2) increasing the solubility of the recombinant protein; and 3) supporting the purification of the recombinant protein by acting as a ligand in affinity purification.
- a proteolytic cleavage site is often introduced at the junction of the fusion unit and the recombinant protein, so that the recombinant protein can be separated from the fusion unit after the fusion protein has been purified.
- These enzymes and their corresponding recognition sequences include factor Xa, thrombin and enterokinase.
- Common fusion expression vectors include pGEX (Pharmacia Biotech Ine; Smith, DB and Johnson, KS (1988) Gene 67: 31-40), pMAL (New England Biolabs, Beverly, MA) and pRIT 5 (Pharmacia, Piscataway, NJ), in which glutathione-S-transferase (GST), maltose E-binding protein or protein A is fused to the recombinant target protein.
- GST glutathione-S-transferase
- the coding sequence of the G6PD protein is cloned into a pGEX expression vector so that a vector is generated which encodes a fusion protein comprising from the N-terminus to the C-terminus, GST - thrombin cleavage site - X- Protein.
- the fusion protein can be purified by affinity chromatography using glutathione-agarose resin.
- the recombinant G6PD protein that is not fused to GST can be obtained by cleaving the fusion protein with thrombin.
- Suitable inducible non-fusion expression vectors from E. coli include pTrc (Amann et al., (1988) Gene 69: 301-315) and pETIld (Studier et al. Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, California (1990) 60-89).
- Target gene expression from the pTrc vector is based on transcription by host RNA polymerase from a hybrid trp-lac fusion promoter.
- the target gene expression from the pETlld vector is based on the transcription from a T7-gnl0-lac fusion promoter, which is mediated by a coexpressed viral RNA polymerase (T7 gnl). This viral polymerase is supplied by the BL 21 (DE3) or HMS174 (DE3) host strains from a resident ⁇ prophage which harbors a T7 gnl gene under the transcriptional control of the lacUV 5 promoter.
- One strategy to maximize the expression of the recombinant protein is to express the protein in a host bacterium whose ability to proteolytically cleave the recombinant protein is impaired (Gottesman, S. Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, California ( 1990) 119-128).
- Another strategy is to change the nucleic acid sequence of the nucleic acid to be inserted into an expression vector, so that the individual codons for each amino acid are those which are preferably used in a bacterium selected for expression, such as C. glutamicum (Wada et al. (1992) Nucleic Acids Res. 20: 2111-2118).
- the G6PD protein expression vector is a yeast expression vector.
- yeast expression vectors for expression in the yeast S. cerevisiae include pYepSecl (Baldari et al., (1987) Embo J. 6: 229-234), pMFa (Kurjan and Herskowitz (1982) Cell 30: 933-943), pJRY88 ( Schultz et al. (1987) Gene 54: 113-123) and pYES2 (Invitrogen Corporation, San Diego, CA).
- Vectors and methods of constructing vectors suitable for use in other fungi, such as filamentous fungi include those described in detail in: van den Hondel, CAMJJ & Punt, PJ (1991) "Gene transfer Systems and vector development for filamentous fungi, in: Applied Molecular Genetics of fungi, JF Peberdy et al., Ed., Pp. 1-28, Cambridge University Press: Cambridge.
- the G6PD proteins of the invention can be expressed in insect cells using baculovirus expression vectors.
- Baculovirus vectors available for expression of proteins in cultured insect cells include the pAc series (Smith et al., (1983) Mol. Cell Biol .. 3: 2156-2165) and pVL series (Lucklow and Summers (1989) Virology 170: 31-39).
- the G6PD proteins according to the invention can be expressed in single-cell plant cells (such as algae) or in plant cells of higher plants (for example spermatophytes, such as crops).
- plant expression vectors include those described in detail in: Becker, D., Kemper, E., Schell, J. and Masterson, R. (1992) "New plant binary vectors with selectable markers located proximal to the left border ", Plant Mol. Biol. 20: 1195-1197; and Bevan, M.W. (1984) "Binary Agrobacterium vectors for plant transformation", Nucl. Acids Res. 12: 8711-8721.
- a nucleic acid according to the invention is expressed in mammalian cells with a mammalian expression vector.
- mammalian expression vectors include pCDM8 (Seed, B. (1987) Nature 329: 840) and pMT2PC (Kaufman et al. (1987) EMBO J. 6: 187-195).
- the control functions of the expression vector are often provided by viral regulatory elements. Commonly used promoters come, for example, from Polyoma, Adenovirus2, Cytomegalievirus and Simian Virus 40.
- the recombinant mammalian expression vector can preferably bring about the expression of the nucleic acid in a specific cell type (for example, tissue-specific regulatory elements are used to express the nucleic acid).
- tissue-specific regulatory elements are known in the art.
- suitable tissue-specific regulatory elements are known in the art.
- 10 gnete tissue-specific promoters include the albumin promoter (liver-specific; Pinkert et al. (1987) Genes Dev. 1: 268-277), lymphoid-specific promoters (Calame and Eaton (1988) Adv. Immunol. 43: 235-275), in particular Promoters of T cell receptors (Winoto and Baltimore (1989) EMBO J. 8: 729-733) and immune
- milk serum promoter e.g., milk serum promoter; U.S. Patent No. 4,873,316 and European Patent Application Publication No. 264,166
- Development-regulated promoters are also included, for example the mouse hox promoters (Kessel and Gruss (1990) Science 249: 374-379) and the ⁇ -fetoprotein promoter (Campes and Tilghman (1989) Genes Dev. 3:
- the invention also provides a recombinant expression vector comprising a DNA molecule according to the invention which is cloned into the expression vector in the antisense direction.
- the DNA molecule is operatively linked to a regulatory sequence such that expression (by transcription of the DNA-.Molecule) of an RNA molecule that is antisense to the G6PD mRNA is possible.
- Regulatory sequences can be selected that are functional to an antisense rich
- Viral promoters and / or enhancers or regulatory sequences can be selected which are constitutive, tissue-specific or cell-type-specific expression
- the antisense expression vector can be in the form of a recombinant plasmid, phagemid or attenuated virus in which antisense nucleic acids are produced under the control of a highly effective regulatory region, the activity of which is determined by the cell type in which
- Another aspect of the invention relates to the host cells into which a recombinant expression vector according to the invention has been introduced.
- the terms "host cell” and “recombinant host cell” are used interchangeably here. It goes without saying that these terms refer not only to a specific target cell, but also to the descendants or potential descendants of this cell. Since certain modifications may occur in successive generations due to mutation or environmental influences, these offspring are not necessarily identical to the parental cell, but are still included in the scope of the term as used here.
- a host cell can be a prokaryotic or eukaryotic cell.
- a G6PD protein can be expressed in bacterial cells such as C. glutamicum, insect cells, yeast or mammalian cells (such as Chinese hamster ovary cells (CHO) or COS cells).
- suitable host cells are known to the person skilled in the art.
- Microorganisms which are related to Corynebacterium glutamicum and which can be suitably used as host cells for the nucleic acid and protein molecules according to the invention are listed in Table 3.
- vector DNA can be introduced into prokaryotic or eukaryotic cells.
- transformation and “transfection” as used here are intended to encompass a large number of methods known in the prior art for introducing foreign nucleic acid (for example DNA) into a host cell, including calcium phosphate or calcium chloride coprecipitation, DEAE-dextran-mediated transfection, lipofection or electroporation. Suitable methods for transforming or transfecting host cells can be found in Sambrook et al. (Molecular Cloning: A Laboratory Manual. 2nd Ed. Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989) and other laboratory manuals.
- a gene that encodes a selectable marker (eg resistance to antibiotics) is usually introduced into the host cells together with the gene of interest.
- selectable markers include those that are resistant to medicinal products. elements such as G418, hygro ycin and methotrexate.
- a nucleic acid encoding a selectable marker can be introduced into a host cell on the same vector as that encoding a G6PD protein, or can be introduced on a separate vector. Cells that have been stably transfected with the introduced nucleic acid can be identified by drug selection (eg cells that have integrated the selectable marker survive, whereas the other cells die).
- a vector which contains at least a section of a G6PD gene into which a deletion, addition or substitution has been introduced in order to change, for example functionally disrupt, the G6PD gene.
- This G6PD gene is preferably a Corynebacterium glutamicum G6PD gene, but a homologue from a related bacterium or even from a mammalian, yeast, or insect source can be used.
- the vector is designed such that the endogenous G6PD gene is functionally disrupted when homologous recombination occurs (i.e. no longer encodes a functional protein, also referred to as a "knockout" vector).
- the vector can be designed in such a way that the endogenous G6PD gene is mutated or otherwise altered in the case of homologous recombination, but still codes the functional protein (for example the upstream regulatory region can be altered in such a way that the expression of the endogenous G6PD protein is thereby effected is changed.).
- the modified portion of the G6PD gene is flanked in the homologous recombination vector at its 5 'and 3' ends by additional nucleic acid of the G6PD gene, which is a homologous recombination between the exogenous G6PD gene carried by the vector. and an endogenous G6PD gene in a microorganism.
- the additional flanking G6PD nucleic acid is long enough for successful homologous recombination with the endogenous gene.
- the vector usually contains several kilobases of flanking DNA (at both the 5 'and 3' ends) (see e.g. Thomas, K.R. and Capecchi, M.R. (1987) Cell 51: 503 for a description of homologous recombination vectors).
- the vector is introduced into a microorganism (e.g., by electroporation), and cells in which the introduced G6PD gene is homologously recombined with the endogenous G6PD gene are selected using methods known in the art.
- recombinant microorganisms can be produced which contain selected systems which allow regulated expression of the introduced gene.
- a host cell according to the invention such as a prokaryotic or eukaryotic host cell in culture, can be used to produce (i.e., express) a G6PD protein.
- the invention also provides methods for producing G6PD proteins using the host cells of the invention.
- the method comprises culturing the host cell according to the invention (into which a recombinant expression vector encoding a G6PD protein has been introduced, or into whose genome a gene encoding a wild-type or modified G6PD protein has been introduced) in a suitable medium until the G6PD protein has been produced.
- the method comprises isolating the G6PD proteins from the medium or the host cell.
- the nucleic acid molecules, proteins, protein homologs, fusion proteins, primers, vectors and host cells described here can be used in one or more of the following methods: identification of C. glutamicum and related organisms, mapping of genomes of organisms that are related to C. glutamicum related, identification and localization of C. glu amicum sequences of interest, evolution studies, determination of G6PD protein regions which are necessary for the function, modulation of the activity of a G6PD protein; Modulating the activity of a G6PD pathway; and modulating the cellular production of a desired compound, such as a fine chemical.
- the G6PD nucleic acid molecules according to the invention have a multitude of uses.
- the invention provides the nucleic acid sequences of a number of C. gl u tamicum genes. By probing the extracted genomic DNA of a culture of a uniform or mixed population of microorganisms under stringent conditions with a probe comprising a region of a C. glu amicum gene that is unique to that organism, one can determine whether this organism is present , Corynebacterium glutamicum itself is not pathogenic, but it is with pathogenic species such as Corynebacterium dipthe riae, related. The detection of such an organism is of significant clinical importance.
- the nucleic acid and protein molecules according to the invention can serve as markers for specific regions of the genome. This is useful not only when mapping the genome, but also for functional studies of C. glu amicum proteins.
- the C. glu amicum geno can be cleaved, for example, and the fragments incubated with the DNA-binding protein.
- Those that bind the protein can additionally be probed with the nucleic acid molecules according to the invention, preferably with easily detectable labels; the binding of such a nucleic acid molecule to the genome fragment enables the fragment to be located on the genomic map of C.
- nucleic acid molecules according to the invention can moreover be sufficiently homologous to the sequences of related species so that these nucleic acid molecules can serve as markers for the construction of a genomic map in related bacteria, such as BrevJ-bacterer u lactofermentum.
- the G6PD nucleic acid molecules according to the invention are also suitable for evolution and protein structure studies.
- the sugar intake system in which the molecules according to the invention are involved is used by many bacteria;
- the degree of evolutionary kinship of the organisms can be determined. Accordingly, such a comparison enables the determination of which sequence regions are conserved and which are not, which can be helpful in determining those regions of the protein which are essential for the enzyme function.
- This type of determination is valuable for protein technology studies and can provide an indication of which protein can tolerate mutagenesis without losing function.
- the manipulation of the G6PD nucleic acid molecules according to the invention can bring about the production of G6PD proteins with functional differences from the wild-type G6PD proteins. These proteins can be improved in their efficiency or activity, can be present in the cell in larger numbers than usual, or can be weakened in their efficiency or activity.
- the G6PD molecules according to the invention can be modified in such a way that the yield, production and / or efficiency of production of one or more fine chemicals is improved. By modifying a G6PD protein involved in glucose uptake to have optimal activity, the extent of glucose uptake or the rate at which glucose is delivered into the cell can be increased.
- the breakdown of glucose and other sugars within the cell provides the energy that can be used to drive energetically unfavorable biochemical reactions, such as those involved in the biosynthesis of fine chemicals. This degradation also provides intermediate and precursor molecules for the biosynthesis of certain fine chemicals, such as amino acids, vitamins and cofactors.
- the G6PD molecules according to the invention can be involved in one or more intracellular signal transduction pathways which influence the yields and / or production rate of one or more fine chemicals from C. glutamicum.
- proteins that are necessary for the import of one or more sugars from the extracellular medium eg HPr, enzyme 1 or a building block of an enzyme-II complex
- HPr high intracellular fructose-1,6-bisphosphate levels cause the phosphorylation of HPr on serine-46, whereupon this molecule can no longer participate in the transport of a sugar.
- This intracellular sugar level, at which the transport system is switched off, may be sufficient to maintain the normal functioning of the cell, but is restrictive for the overproduction of the desired fine chemical. It is therefore desirable to modify the G6PD proteins of the invention so that they no longer support such negative regulation are receptive. This results in larger intracellular concentrations of one or more sugars, and by extension, more efficient production or greater yields of one or more fine chemicals from organisms that contain these mutant G6PD proteins.
- the nucleic acid and protein molecules according to the invention can be used to generate C. glutamicum or related bacterial strains which express mutant G6PD nucleic acid and protein molecules, so that the yield, production and / or efficiency of the production of a desired one Connection is improved.
- the desired compound can be a natural product of C. glutamicum which comprises the end products of the biosynthetic pathways and intermediates of naturally occurring metabolic pathways as well as molecules which do not occur naturally in the metabolism of C. glutamicum but which are produced by a C. glutamicum strain according to the invention become.
- Example 1 Preparation of the entire genomic DNA from Corynebacterium glutamicum ATCC13032
- a culture of Corynebacterium glutamicum was grown overnight at 30 ° C with vigorous shaking in BHI medium (Difco). The cells were harvested by centrifugation, the supernatant was discarded, and the cells were placed in 5 ml of buffer I (5% of the original volume of the culture - all stated
- the composition of buffer I 140.34 g / 1 sucrose, 2.46 g / 1 MgS0 4 • 7 H 2 0, 10 ml / 1 KH 2 P0 4 solution (100 g / l, adjusted to pH with KOH 6.7), 50 ml / 1 M12 concentrate (10 g / 1 (NH 4 ) 2 S0 4 , 1 g / 1 NaCl, 2 g / 1 MgS0 • 7 H0, 0.2 g / 1 CaCl 2 , 0 , 5 g / 1 yeast extract (Difco), 10 ml / 1 trace element mixture (200 mg / 1 FeS0 4 ⁇ H 2 0, 10 mg / 1 ZnS0 4 • 7 H 2 0, 3 mg / 1 MnCl 2 • 4 H 2 0, 30 mg / 1 H 3 B0 3 , 20 mg / 1 CoCl 2 • 6 H 2 0, 1 mg / 1 NiC
- Lysozyme was added to the suspension at a final concentration of 2.5 mg / ml. After about 4 hours of incubation at 37 ° C, the cell wall was broken down and the protoplasts obtained were harvested by centrifugation. The pellet was washed once with 5 ml of buffer
- the DNA was purified by extraction with phenol, phenol-chloroform-isoamyl alcohol and chloroform-isoamyl alcohol using standard procedures. The DNA was then extracted by adding 1/50 volume of 3 M sodium acetate and 2 volumes of ethanol, followed by incubation for 30 min at -20 ° C. and centrifugation for 20 min at 12,000 rpm in a high-speed centrifuge with an SS34 rotor (Sorvall). The DNA was dissolved in 1 ml of TE buffer containing 20 ⁇ g / ml RNase A and dialyzed against 1000 ml of TE buffer for at least 3 hours at 4 ° C. During this time, the buffer was exchanged 3 times To 0.4 ml aliquots of the
- 30 can be used, including Southern blotting or to construct genomic libraries.
- Plasmids of the pBS series pBSSK +, pBSSK- and others; Stratagene, LaJolla, USA
- Cos- mide such as SuperCosl (Stratagene, LaJolla, USA) or Lorist6 (Gibson, TJ Rosenthal, A., and Waterson, RH (1987) Gene 53: 283-286.
- Genomic banks as described in Example 2, were used for DNA sequencing according to standard methods, in particular the chain termination method with ABI377 sequencing machines (see eg Fleischman, RD et al. (1995) "Whole-genome Random Sequencing and Assembly of Haemophilus Influenzae Rd. , Science 269; 496-512)
- the sequencing primers with the following nucleotide sequences were used: 5 '-GGAAACAGTATGACCATG-3' or
- In vivo mutagenesis of Corynebacterium glutamicum can be performed by passing a plasmid (or other vector) DNA through E. coli or other microorganisms (e.g. Bacillus spp. Or yeasts such as Saccharomyces cerevisiae) that maintain the integrity of their genetic information cannot maintain.
- E. coli or other microorganisms e.g. Bacillus spp. Or yeasts such as Saccharomyces cerevisiae
- Common mutator strains have mutations in the genes for the DNA repair system (eg, mutHLS, mutD, mutT, etc., for comparison see Rupp, WD (1996) DNA repair mechanisms in Escherichia coli and Salmonella, pp. 2277-2294, ASM : Washington). These strains are known to the person skilled in the art. The use of these strains is, for example, in Greener, A. and Callahan, M. (1994) Strategies 7; 32-34 illustrates.
- Example 5 DNA transfer between Escherichia coli and Corynebacterium glutamicum
- Corynebacterium and BreviJbacterium species contain endogenous plasmids (such as pHM1519 or pBLl) that replicate autonomously (for an overview, see, for example, Martin, JF et al. (1987) Biotechnology 5: 137-146).
- Shuttle vectors for Escherichia coli and Corynebacterium glutamicum can easily be constructed using standard vectors for E. coli (Sambrook, J. et al., (1989), "Molecular Cloning: A Laboratory Manual", Cold Spring Harbor Laboratory Press or Ausubel, FM et al.
- origins of replication are preferably taken from endogenous plasmids isolated from Corynebacterium and BreviJbactertium species.
- transformation markers for these species are genes for kanamycin resistance (such as those derived from the Tn5 or Tn-903 transposon) or for chloramphenicol (Winnacker, EL (1987) "From Genes to Clones - Introduction to Gene Techno- logy, VCH, Weinheim)
- kanamycin resistance such as those derived from the Tn5 or Tn-903 transposon
- chloramphenicol Winnacker, EL (1987) "From Genes to Clones - Introduction to Gene Techno- logy, VCH, Weinheim
- glutamicum and which can be used for various purposes, including gene overexpression (see, e.g., Yoshihama, M. et al. (1985) J. Bacteriol. 162: 591-597, Martin, JF et al., (1987) Biotechnology, 5: 137-146 and Eikmanns, BJ et al. ( 1992) Gene 102: 93-98).
- C. glutamicum can be carried out by protoplast transformation (Kastsumata, R. et al., (1984) J. Bacteriol. 159, 306-311), electroporation (Liebl, E. et al., (1989) FEMS Microbiol. Letters , 53: 399-303) and, in cases where special vectors are used, can also be achieved by conjugation (as described, for example, in Schaefer, A., et (1990) J. Bacteriol. 172: 1663-1666).
- a suitable method for determining the amount of transcription of the mutant gene is to carry out a Northern blot (see, for example, Ausubel et al., (1988) Current Protocols) in Molecular Biology, Wiley: New York), wherein a primer that is designed to bind to the gene of interest is provided with a detectable (usually radioactive or chemiluminescent) label so that - if the total RNA is one Culture of the organism extracted, separated on a gel, transferred to a stable matrix and incubated with this probe - the binding and the quantity of binding of the probe are present and also indicates the amount of mRNA for that gene.
- a detectable label usually radioactive or chemiluminescent
- Total cell RNA can be isolated from Corynebacterium glutamicum by various methods known in the art, as described in Bormann, ER et al., (1992) Mol. Microbiol. 6: 317-326.
- This probe 15 bodies, incubated, which binds specifically to the desired protein.
- This probe is usually provided with a chemiluminescent or colorimetric label that is easy to detect. The presence and the observed amount of label shows the presence and the amount of the mutant product sought.
- Example 7 Growth of genetically modified Corynebacterium glutamicum media and growing conditions
- sugars such as mono-, di- or polysaccharides.
- Very good carbon sources are, for example, glucose, fructose, mannose, galactose, ribose, sorbose, ribulose, lactose, maltose, sucrose, raffinose, starch or cellulose.
- Nitrogen sources are usually organic or inorganic nitrogen compounds or materials 5, containing these compounds.
- Exemplary nitrogen sources include ammonia gas or ammonium salts, such as NH 4 C1 or (NH 4 ) S0 4 , NH 4 OH, nitrates, urine Substance, amino acids or complex nitrogen sources such as corn steep liquor, soy flour, soy protein, yeast extracts, meat extracts and others.
- Inorganic salt compounds that may be included in the media include the chloride, phosphorus, or sulfate salts of calcium, magnesium, sodium, cobalt, molybdenum, potassium, manganese, zinc, copper and iron.
- Chelating agents can be added to the medium to keep the metal ions in solution.
- Particularly suitable chelating agents include dihydroxyphenols, such as catechol or protocatechuate, or organic acids, such as citric acid.
- the media usually also contain other growth factors, such as vitamins or growth promoters, which include, for example, biotin, ribofavin, thiamine, folic acid, nicotinic acid, panthothenate and pyridoxine.
- Growth factors and salts often come from complex media components such as yeast extract, molasses, corn steep liquor and the like.
- the exact composition of the media connections depends heavily on the respective experiment and is decided individually for each case. Information on media optimization is available from the textbook "Applied Microbiol. Physiology, A Practical Approach” (ed. P.M. Rhodes, P.F. Stanury, IRL Press (1997) pp. 53-73, ISBN 0 19 963577 3).
- Growth media can also be obtained from commercial suppliers, such as Standard 1 (Merck) or BHI (Brain heart infusion, DIFCO) and the like.
- All media components are sterilized, either by heat (20 min at 1.5 bar and 121 ° C) or by sterile filtration.
- the components can either be sterilized together or, if necessary, separately. All media components can be present at the beginning of the cultivation or can be added continuously or in batches.
- the growing conditions are defined separately for each experiment.
- the temperature should be between 15 ° C and 45 ° C and can be kept constant or changed during the experiment.
- the pH of the medium should be in the range of 5 to 8.5, preferably around 7.0, and can be maintained by adding buffers to the media.
- An exemplary buffer for this purpose is a potassium phosphate buffer.
- Synthetic buffers such as MOPS, HEPES; ACES etc. can be used alternatively or simultaneously.
- the cultivation pH can also be kept constant during the cultivation by adding NaOH or NH 4 OH. If complex media components such as yeast extract are used, the need for additional buffers is reduced, since many complex compounds have a high buffer capacity.
- a Fermenters for the cultivation of microorganisms can also regulate the pH value with gaseous ammonia.
- the incubation period is usually in the range of several hours to several days. This time is selected so that the maximum amount of product accumulates in the broth.
- the disclosed growth experiments can be carried out in a variety of containers, such as microtiter plates, glass tubes, glass flasks or glass or metal fermenters of different sizes.
- the microorganisms should be grown in microtiter plates, glass tubes or shake flasks with or without baffles.
- 100 ml shake flasks are used, which are filled with 10% (by volume) of the required growth medium.
- the flasks should be shaken on a rotary shaker (amplitude 25 mm) at a speed in the range of 100-300 rpm. Evaporation losses can be reduced by maintaining a humid atmosphere; alternatively, a mathematical correction should be carried out for the evaporation losses.
- the medium is seeded to an OD 6 oo of 0/5-1.5 using cells grown on agar plates, such as CM plates (10 g / 1 glucose, 2.5 g / 1 NaCl, 2 g / 1 urea, 10 g / 1 polypeptone, 5 g / 1 yeast extract, 5 g / 1 meat extract, 22 g / 1 agar pH 6.8 with 2 M NaOH), which have been incubated at 30 ° C.
- the inoculation of the media is carried out either by introducing a saline solution of C. glutamicum cells from CM plates or by adding a liquid preculture of this bacterium.
- DNA band shift assays also referred to as gel retardation assays
- reporter gene assays as described in Kolmar, H. et al., (1995) EMBO J. 14: 3895-3904 and the references cited therein. Reporter gene test systems are well known and established for use in pro- and eukaryotic cells using enzymes such as beta-galactosidase, green fluorescent protein and several others.
- membrane transport proteins The activity of membrane transport proteins can be determined according to the techniques described in Gennis, R.B. (1989) "Pores, Channels and Transporters", in Biomembranes, Molecular Structure and Function, Springer: Heidelberg, pp. 85-137; 199-234; and 270-322.
- the effect of the genetic modification in C. glutamicum on the production of a desired compound can be determined by growing the modified microorganisms under suitable conditions (such as those described above) and the medium and / or the cell - Lular components is examined for the increased production of the desired product (ie an amino acid).
- suitable conditions such as those described above
- Such analysis techniques are well known to the person skilled in the art and include spectroscopy, thin-layer chromatography, staining methods of various types, enzymatic and microbiological methods and analytical chromatography, such as high-performance liquid chromatography (see, for example, Ullman, Encyclopedia of Industrial Chemistry, Vol. A2, p. A2). 89-90 and pp.
- the analysis methods include measurements of the amounts of nutrients in the medium (e.g. sugar, hydrocarbons, nitrogen sources, phosphate and other ions), measurements of the biomass composition and growth, analysis of the production of common metabolites from biosynthetic pathways and measurements of gases that are produced during fermentation - 0 be fathered. Standard methods for these measurements are in
- Example 10 Purification of the desired product from C. glutamicum culture
- the desired product can be obtained from C. glutamicum cells or from the supernatant of the culture described above by various methods known in the art. If the desired product is not secreted from the cells, the cells from the culture can be harvested by low-speed centrifugation, the cells can by standard techniques, such as 5 mechanical force or sonication are lysed. The cell debris is removed by centrifugation and the supernatant fraction containing the soluble proteins is obtained for further purification of the desired compound. If the product is secreted from the C. glutamicum cells Zel- be * ⁇ len by slow centrifugation from the culture removed and the supernatant fraction is retained for further purification.
- the supernatant fraction from either purification method is subjected to chromatography with a suitable resin, the desired 5 molecule is either retained on the chromatography resin while many contaminants but not, or the contaminants remaining in the sample on the resin, the However, no rehearsal.
- chromatography steps can be repeated if necessary using the same or different chromatography resins.
- the person skilled in the art is skilled in the selection of the suitable chromatography resins and the most effective application for a particular molecule to be purified.
- the purified product can be concentrated by filtration or ultrafiltration and kept at a temperature at which the stability of the product is at a maximum.
- the identity and purity of the isolated compounds can be determined by standard techniques in the art. These include high-performance liquid chromatography (HPLC), spectroscopic methods, staining methods, thin-layer chromatography, NIRS, enzyme test or microbiological tests. These analysis methods are summarized in: Patek et al. (1994) Appl. Environ. Microbiol. 60: 133-140; Malakhova et al. (1996) Biotekhnologiya 11: 27-32; and Schmidt et al. (1998) Bioprocess Engineer. 19: 67-70. Ulmann's Encyclopedia of Industrial Chemistry (1996) Vol. A27, VCH: Weinheim, pp. 89-90, pp. 521-540, pp. 540-547, pp.
- HPLC high-performance liquid chromatography
- NIRS enzyme test or microbiological tests.
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| EP07123951.1A EP1911846B1 (de) | 2001-11-13 | 2002-11-11 | Gene die für Glucose-6-Phosphat-Dehydrogenase Proteine codieren |
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| DE10155505A DE10155505A1 (de) | 2001-11-13 | 2001-11-13 | Gene die für Glucose-6-Phosphat-Dehydrogenase Proteine codieren |
| DE10155505 | 2001-11-13 | ||
| PCT/EP2002/012556 WO2003042389A1 (de) | 2001-11-13 | 2002-11-11 | Gene die für glucose-6-phosphat-dehydrogenase proteine codieren |
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| US7153666B2 (en) | 2003-07-17 | 2006-12-26 | General Atomics | Methods and compositions for determination of glycated proteins |
| DE10359661A1 (de) * | 2003-12-18 | 2005-07-28 | Basf Ag | Genvarianten die für Proteine aus dem Stoffwechselweg von Feinchemikalien codieren |
| DE102005013676A1 (de) * | 2005-03-24 | 2006-09-28 | Degussa Ag | Allele des zwf-Gens aus coryneformen Bakterien |
| US20070092951A1 (en) * | 2005-03-24 | 2007-04-26 | Degussa Ag | Alleles of the zwf gene from coryneform bacteria |
| US7855079B2 (en) | 2006-07-25 | 2010-12-21 | General Atomics | Methods for assaying percentage of glycated hemoglobin |
| US7943385B2 (en) | 2006-07-25 | 2011-05-17 | General Atomics | Methods for assaying percentage of glycated hemoglobin |
| EP2283149A1 (de) * | 2008-05-13 | 2011-02-16 | General Atomics | Elektrochemischer biosensor zur direkten bestimmung des prozentsatzes von glykosyliertem hämoglobin |
| US9169502B2 (en) | 2010-06-15 | 2015-10-27 | Paik Kwang Industrial Co., Ltd. | Method of producing L-lysine using a Corynebacterium glutamicum microorganism |
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| US4873316A (en) | 1987-06-23 | 1989-10-10 | Biogen, Inc. | Isolation of exogenous recombinant proteins from the milk of transgenic mammals |
| DE3908201A1 (de) | 1989-03-14 | 1990-09-27 | Degussa | Verfahren zur fermentativen herstellung von l-lysin |
| DE4120867A1 (de) | 1991-06-25 | 1993-01-07 | Agfa Gevaert Ag | Fotografisches verarbeitungsverfahren und vorrichtung dafuer |
| EP0693558B1 (de) | 1994-07-19 | 2002-12-04 | Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo | Trehalose, ihre Herstellung und ihre Verwendung |
| KR100878336B1 (ko) * | 1999-06-25 | 2009-01-14 | 백광산업 주식회사 | 탄소 대사 및 에너지 생산과 관련된 단백질을 코딩하는코리네박테리움 글루타미쿰 유전자 |
| ID29569A (id) * | 1999-07-09 | 2001-09-06 | Degussa Ag Cs | Urutan nucleotida yang menyandi gen opca |
| JP4623825B2 (ja) | 1999-12-16 | 2011-02-02 | 協和発酵バイオ株式会社 | 新規ポリヌクレオチド |
| SK287997B6 (sk) * | 2000-03-20 | 2012-09-03 | Evonik Degussa Gmbh | Isolated gene of Corynebacterium glutamicum, recombinant coryneform bacteria and process for preparation of L-lysine or L-threonine |
| WO2001098472A1 (en) * | 2000-06-21 | 2001-12-27 | Kyowa Hakko Kogyo Co., Ltd | Novel glucose-6-phosphate dehydrogenase |
| BRPI0418482A (pt) * | 2004-01-29 | 2007-06-19 | Degussa | processo para o preparo de l-aminoácidos com amplificação do gene zwf |
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2010
- 2010-07-23 US US12/842,166 patent/US20110129882A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03042389A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110129882A1 (en) | 2011-06-02 |
| CN1316027C (zh) | 2007-05-16 |
| EP1911846A2 (de) | 2008-04-16 |
| BR0214056A (pt) | 2004-10-13 |
| WO2003042389A1 (de) | 2003-05-22 |
| EP1911846A3 (de) | 2009-12-09 |
| BR0216047A (pt) | 2010-09-14 |
| US20050014235A1 (en) | 2005-01-20 |
| DE10155505A1 (de) | 2003-05-22 |
| CN1646690A (zh) | 2005-07-27 |
| EP1911846B1 (de) | 2015-04-01 |
| KR20050044854A (ko) | 2005-05-13 |
| US20080176296A1 (en) | 2008-07-24 |
| ZA200404647B (en) | 2005-06-13 |
| US7226762B2 (en) | 2007-06-05 |
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