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WO2002006459A1 - Procede de preparation de l-threonine par fermentation - Google Patents

Procede de preparation de l-threonine par fermentation Download PDF

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Publication number
WO2002006459A1
WO2002006459A1 PCT/EP2001/005548 EP0105548W WO0206459A1 WO 2002006459 A1 WO2002006459 A1 WO 2002006459A1 EP 0105548 W EP0105548 W EP 0105548W WO 0206459 A1 WO0206459 A1 WO 0206459A1
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threonine
gene
seq
codes
enhanced
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PCT/EP2001/005548
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English (en)
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Mechthild Rieping
Georg Thierbach
Michel Eduard Van Der Rest
Douwe Molenaar
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Degussa Ag
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Priority claimed from DE10103874A external-priority patent/DE10103874A1/de
Application filed by Degussa Ag filed Critical Degussa Ag
Priority to AU2001265969A priority Critical patent/AU2001265969A1/en
Priority to EP01943376A priority patent/EP1303590A1/fr
Publication of WO2002006459A1 publication Critical patent/WO2002006459A1/fr

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    • 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
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P13/00—Preparation of nitrogen-containing organic compounds
    • C12P13/04—Alpha- or beta- amino acids
    • C12P13/08—Lysine; Diaminopimelic acid; Threonine; Valine

Definitions

  • This invention relates to the new amino acid sequence of the malate: quinone oxidoreductase enzyme protein (Mqo) of Enterobacteriaceae and to a process for the fermentative preparation of L-threonine using Enterobacteriaceae in which the mqo gene is enhanced.
  • Mqo quinone oxidoreductase enzyme protein
  • L-Threonine is used in animal nutrition, in human medicine and in the pharmaceuticals industry. It is known that L- threonine can be prepared by fermentation of strains of Enterobacteriaceae, in particular Escherichia coli and
  • Serratia marcescens Because of their great importance, work is constantly being undertaken to improve the preparation processes. Improvements to the process can relate to fermentation measures, such as e.g. stirring and supply of oxygen, or the composition of the nutrient media, such as e.g. the sugar concentration during the fermentation, or the working up to the product form by- e.g. ion exchange chromatography, or the intrinsic output properties of the microorganism itself.
  • fermentation measures such as e.g. stirring and supply of oxygen, or the composition of the nutrient media, such as e.g. the sugar concentration during the fermentation, or the working up to the product form by- e.g. ion exchange chromatography, or the intrinsic output properties of the microorganism itself.
  • Methods of mutagenesis, selection and mutant selection are used to improve the output properties of these microorganisms.
  • Strains which are resistant to antimetabolites such as e.g. the threonine analogue ⁇ - amino- ⁇ -hydroxyvaleric acid (AHV) , or are auxotrophic for metabolites of regulatory importance and produce L- threonine are obtained ' ' in this manner.
  • antimetabolites such as e.g. the threonine analogue ⁇ - amino- ⁇ -hydroxyvaleric acid (AHV)
  • auxotrophic for metabolites of regulatory importance and produce L- threonine are obtained ' ' in this manner.
  • the inventors had the object of providing new measures for improved fermentative preparation of L-threonine.
  • the invention provides a polypeptide from
  • polypeptide which is at least 70%-, preferably at least 80%, particularly preferably at least 90 to 95% identical to the amino acid sequence shown in SEQ ID NO. 2, or
  • polypeptide according to SEQ ID NO. 2 including deletion, insertion or exchange of one or more amino acids, or
  • polypeptide according to SEQ ID NO. 2 including N- or C-terminal lengthening by one or more amino acids
  • the total length of the polypeptide according to b) , c) or ' d) being at least 514 and at most 544, preferably at least 519 and at most 539, in a preferred form at least 524 and at most 534, particularly preferably at least 527 and at most 531 amino acid radicals.
  • the invention furthermore provides a polynucleotide from Enterobacteriaceae which codes for a polypeptide with malate: quinone oxidoreductase (Mqo) activity (E.C. 1.1.99.16), chosen from the group consisting of a) DNA which contains the nucleotide sequence corresponding to nucleobases 7 to 1593 of SEQ ID NO. 1, or
  • DNA which is at least 70%, preferably at least 80%, particularly preferably at least 90 to 95% identical to that mentioned in a) or b) , or
  • the invention also provides
  • Polynucleotide in general relates to polyribonucleotides and polydeoxyribonucleotides, it being possible for these to be non-modified RNA or DNA or modified RNA or DNA.
  • Polypeptides is understood as meaning peptides or proteins which comprise two or more amino acids bonded via peptide bonds.
  • the polypeptides according to the invention include the polypeptides according to SEQ ID NO. 2, which have malate: quinone oxidoreductase activity, and also those which are at least 70%, preferably at least 80% and in particular at least 90% to 95% identical to the polypeptide according to SEQ ID NO. 2 and have the activity mentioned.
  • the invention provides a process for the fermentative preparation of L-threonine using Enterobacteriaceae which in particular already produce L- threonine and in which the nucleotide sequence (s) which code(s) for the mqo gene are enhanced, in particular over- expressed.
  • the process is a process for the preparation of L-threonine, which comprises carrying out the following steps :
  • Enterobacteriaceae in which at least the mqo gene is enhanced (over-expressed) , optionally in combination with further genes,
  • enhancement in this connection describes the increase in the intracellular activity of one or more enzymes or proteins in a microorganism which are coded by the corresponding DNA, for example by increasing the number of copies of the gene or genes, using a potent promoter or a gene which codes for a corresponding enzyme or protein with a high activity, and optionally combining these measures.
  • the microorganisms which the present invention provides can prepare L-threonine from glucose, sucrose, lactose, fructose, maltose, molasses, starchy or from glycerol and ethanol. They are representatives of Enterobacteriaceae, in particular of the genera Escherichia and Serratia. Of the genus Escherichia the species E. coli and of the genus Serratia the species Serratia marcescens are to be mentioned in particular. Suitable L-threonine-producing strains of the genus Escherichia, in particular of the species E. coli, are, for example
  • Escherichia coli B-3996 (pM : : THY)
  • Suitable L-threonine-producing strains of the genus Serratia in particular of the species Serratia marcescens, are, for example
  • the nucleotide sequence of the chromosome of E. coli is known and is available in databanks accessible to the public, such as, for example, the databank of the European Molecular Biology Laboratories (EMBL, Heidelberg, Germany) . Examples of such sequences deposited are the entries accessible under number AE000310 or D90850.
  • quinone oxidreductase proteins designated protein B and C, which have the N-terminal amino acid sequence shown in SEQ ID No. 11 and 12. These are also provided by the invention.
  • Enterobacteriaceae produce L- threonine in an improved manner after over-expression of the mqo gene, which codes for malate: quinone oxidoreductase (E.C. 1.1.99.16) .
  • Alleles of the mqo gene which result from the degeneracy of the genetic code or due to "sense mutations" of neutral function can furthermore be used. It is also known that the amino acid methionine or formylmethionine coded by the start codon ATG can be removed in various proteins by enzymes of the host.
  • the number of copies of the corresponding genes can be increased, or the promoter and regulation region or the ribosome binding site upstream of the structural gene can be mutated.
  • Expression cassettes which are incorporated upstream of the structural gene act in the same way.
  • inducible promoters it is additionally possible to increase the expression in the course of fermentative L-threonine production.
  • the expression is likewise improved by measures to prolong the life of the m-RNA.
  • the enzyme activity is also increased by preventing the degradation of the enzyme protein.
  • the genes or gene constructions can either be present in plasmids with a varying number of copies, or can be integrated and amplified in the chromosome. Alternatively, an over-expression of the genes in question can furthermore be achieved by changing the composition of the media and the culture procedure.
  • Enterobacteriaceae such as e.g. cloning vectors derived from pACYC184 (Bartolome et al.; Gene 102, 75-78 (1991)), pTrc99A, which is described by Amann et al. (Gene 69:301- 315 (1988)), or pSClOl derivatives (Vocke and Bastia, Proceedings of the National Academy of Science, USA 80
  • a strain transformed with a plasmid vector where the plasmid vector carries the nucleotide sequence which codes for the mqo gene can be employed in a process according to the invention.
  • L- threonine in addition to the enhancement of the mqo gene, for one or more of the genes chosen from the group consisting of:
  • microorganisms produced according to the invention can be cultured in the batch process (batch culture) or in the fed batch process (feed process) .
  • batch culture batch culture
  • feed process fed process
  • the culture medium to be used must meet the requirements of the particular strains in a suitable manner. Descriptions of culture media for various microorganisms are contained in the handbook “Manual of Methods for General Bacteriology” of the American Society for Bacteriology (Washington D.C., USA, 1981).
  • Sugars and carbohydrates such as e.g. glucose, sucrose, lactose, fructose, maltose, molasses, starch and optionally cellulose, oils and fats, such as e.g. soya oil, sunflower oil, groundnut oil and coconut fat, fatty acids, such as e.g. palmitic acid, stearic acid and linoleic acid, alcohols, such as e.g. glycerol and ethanol, and organic acids, such as e.g. acetic acid, can be used as the source of carbon. These substances can be used individually or as a mixture.
  • oils and fats such as e.g. soya oil, sunflower oil, groundnut oil and coconut fat
  • fatty acids such as e.g. palmitic acid, stearic acid and linoleic acid
  • alcohols such as e.g. glycerol and ethanol
  • organic acids such as e.g. acetic acid
  • Organic nitrogen-containing compounds such as peptones, yeast extract, meat extract, malt extract, corn steep liquor, soya bean flour and urea
  • inorganic compounds such as ammonium sulphate, ammonium chloride, ammonium phosphate, ammonium carbonate and ammonium nitrate, can be used as the source of nitrogen.
  • the sources of nitrogen can be used individually or as a mixture.
  • Phosphoric acid, potassium dihydrogen phosphate or dipotassium hydrogen phosphate or the corresponding sodium- containing salts can be used as the source of phosphorus.
  • the culture medium must furthermore comprise salts of metals, such as e.g. magnesium sulfate or iron sulfate, which are necessary for growth.
  • essential growth substances such as amino acids and vitamins, can be employed in addition to the abovementioned substances.
  • Suitable precursors can moreover be added to the culture medium.
  • the starting substances mentioned can be added to the culture in the form of a single batch, or can be fed in during the culture in a suitable manner.
  • Basic compounds such as sodium hydroxide, potassium hydroxide, ammonia or aqueous ammonia, or acid compounds, such as phosphoric acid or sulfuric acid, can be employed in a suitable manner to control the pH.
  • Antifoams such as e.g. fatty acid polyglycol esters, can be employed to control the development of foam.
  • Suitable substances having a selective action e.g. antibiotics, can be added to the medium to maintain the stability of plasmids.
  • oxygen or oxygen-containing gas mixtures such as e.g. air, are introduced into the culture.
  • the temperature of the culture is usually 25°C to 45°C, and preferably 30°C to 40°C. Culturing is continued until a maximum of L-threonine has formed. This target is usually reached within 10 hours to 160 hours.
  • L-threonine can be carried out by anion exchange chromatography with subsequent ninhydrin derivatization, as described by Spackman et al. (Analytical Chemistry, 30, (1958) , 1190) , or it can take place by reversed phase HPLC as described by Lindroth et al . (Analytical Chemistry (1979) 51: 1167-1174).
  • DSMZ German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
  • the process according to the invention is used for the fermentative preparation of amino acids, in particular L- threonine and L-isoleucine.
  • the incubation temperature during preparation of strains and transformants is 37°C. Temperatures of 30°C and 44°C are used in the gene replacement process according to Hamilton et.al.
  • the mqo gene from E. coli K12 is amplified using the polymerase chain reaction (PCR) and synthetic oligonucleotides .
  • PCR polymerase chain reaction
  • the chromosomal E. coli K12 MG1655 DNA employed for the PCR is isolated according to the manufacturers instructions with "QIAGEN Genomic-tips 100/G" (QIAGEN, Hilden, Germany) .
  • a DNA fragment approx. 1700 base pairs (bp) in size can be amplified with the specific primers under standard PCR conditions (Innis et al. (1990) PCR protocols. A guide to methods and applications, Academic Press) with Pfu-DNA polymerase (Promega Corporation, Madison, USA) .
  • the PCR product is cleaved with the enzyme EcoRI and ligated with the plasmid pMW218 (Nippon Gene, Toyama, Japan) , which is cleaved with the enzymes EcoRI and Smal.
  • the E. coli strain DH5 ⁇ is transformed with the ligation batch and plasmid-carrying cells are selected on LB agar (Lennox, Virology 1:190 (1955)), to which 20 ⁇ g/ml kanamycin is added.
  • Successful cloning of the mqo gene can be demonstrated after plasmid DNA isolation and control cleavage with EcoRI, Accl and Clal.
  • the plasmid is designated pMW218mqo (figure 1) .
  • the L-threonine-producing E. coli strain MG442 is described in US-A- 4,278,765 and deposited as CMIM B-1628 at the Russian National Collection for Industrial Microorganisms (VKPM, Moscow, Russia) .
  • the strain MG442 is transformed with the plasmid pMW218mqo and plasmid-carrying cells are selected on LB agar supplemented with 20 ⁇ g/ml kanamycin.
  • the strain is designated MG442/pMW218mqo.
  • Selected individual colonies of MG442/pMW218mqo are multiplied further on minimal medium with the following composition: 3.5 g/1 Na 2 HP0 4 *2H 2 0, 1.5 g/1 KH 2 P0 4 , 1 g/1 NH 4 C1, 0.1 g/1 MgS0 4 *7H 2 0, 25 mg/1 isoleucine, 2 g/1 glucose, 20 g/1 agar, 20 mg/1 kanamycin.
  • the formation of L-threonine is checked in batch cultures of 10 ml contained in 100 ml conical flasks.
  • 10 ml of preculture medium of the following composition 2 g/1 yeast extract, 10 g/1 (NH 4 ) 2 S0 4 , 1 g/1 KH 2 P0 4 , 0.5 g/1 MgS0 4 *7H 2 0, 15 g/1
  • CaC0 3 , 20 g/1 glucose, 20 mg/1 kanamycin are inoculated and the batch is incubated for 16 hours at 37°C and 180 rp on an ESR incubator from K ⁇ hner AG (Birsfelden, Switzerland) .
  • the concentration of L-threonine formed is then determined in the sterile-filtered culture supernatant with an amino acid analyzer from Eppendorf-BioTronik (Hamburg, Germany) by ion exchange chromatography and post-column reaction with ninhydrin detection.
  • the L-threonine-producing E. coli strain B-3996 is described in US-A- 5,175,107 and deposited at the Russian National Collection for Industrial Microorganisms (VKPM, Moscow, Russia) .
  • strain B- 3996 After culture in antibiotic-free complete medium for approximately ten generations, a derivative of strain B- 3996 which no longer contains the plasmid pVIC40 is isolated.
  • the strain formed is streptomycin-sensitive and is designated B-3996kur.
  • the method described by Hamilton et al. (Journal of Bacteriology (1989) 171: 4617-4622), which is based on the use of the plasmid pMAK705 with a temperature-sensitive replicon, is used for incorporation of a deletion into the tdh gene.
  • the plasmid pDR121 (Ravnikar and Somerville, Journal of Bacteriology (1987) 169:4716-4721) contains a DNA fragment from E. coli 3.7 kilo-base pairs (kbp) in size, on which the tdh gene is coded.
  • pDR121 is cleaved with the restriction enzymes Clal and EcoRV and the DNA fragment 5 kbp in size isolated is ligated, after treatment with Klenow enzyme.
  • the ligation batch is transformed in the E. coli strain DH5 ⁇ and plasmid-carrying cells are selected on LB agar, to which 50 ⁇ g/ l ampicillin are added.
  • B-3996kur is transformed with the plasmid pDM32.
  • the replacement of the chromosomal tdh gene with the plasmid-coded deletion construct is carried out by the selection process described by Hamilton et al. and is verified by standard PCR methods (Innis et al. (1990), PCR Protocols. A Guide to Methods and Applications, Academic Press) with the following oligonucleotide primers (see SEQ ID No. 5 and 6) .
  • Tdhl 5 -TCGCGACCTATAAGTTTGGG-3 ⁇
  • Tdh2 5 -AATACCAGCCCTTGTTCGTG-3 ⁇ .
  • the strain formed is tested for kanamycin sensitivity and is designated B-3996kur ⁇ tdh.
  • B-3996kur ⁇ tdh is transformed with the plasmid pVIC40 isolated from B-3996 and plasmid-carrying cells are selected on LB agar with 20 ⁇ g/ml streptomycin.
  • a selected individual colony is designated B-3996kur ⁇ tdh/pVIC40 and transformed with the plasmid pMW218mqo.
  • Selection is carried out on LB-agar to which 20 ⁇ g/ml streptomycin and 50 ⁇ g/ml kanamycin are added.
  • the strain formed in this way is designated B-3996kur ⁇ tdh/pVIC40, pMW218mqo.
  • the preparation of L-threonine by the strains B-3996kur ⁇ tdh/pVIC40 and B-3996kur ⁇ tdh/pVIC40, pMW218mqo is tested as described in example 2, the minimal medium and the production medium not being supplemented with L- isoleucine.
  • the minimal medium, the preculture medium and the production medium are supplemented with 20 ⁇ g/ml streptomycin for B-3996kur ⁇ tdh/pVIC40 and with 20 ⁇ g/ml streptomycin and 50 ⁇ g/ml kanamycin for B-3996kur ⁇ tdh/pVIC40, pMW218mqo.
  • PCR polymerase chain reaction
  • the primer YOJHla (SEQ ID No 7) was drafted with the aid of the known nucleotide sequence with Accession Number AE000310 (EMBL, European Molecular Biology Laboratories, Heidelberg, Germany) .
  • This primer has the sequence:
  • the primer YCHIS (SEQ ID No 8), which has the following sequence, was employed as the second primer:
  • the primers shown were synthesized by MWG Biotech (Ebersberg, Germany) .
  • the PCR reaction was carried out by the standard PCR method of Innis et al., (PCR Protocols. A Guide to Methods and Applications, 1990, Academic Press, New York, USA) .
  • the PCR was carried out in a Thermocycler from Techne
  • the samples were first denatured for 5 minutes at 94 °C and the Taq polymerase from Promega (Madison, WI, USA) was then added to the sample batch.
  • a cycle comprising denaturing (60 seconds, 94°C) , annealing (60 seconds, 60°C) and synthesis (120 seconds, 72°C) was then passed through 10 times, the annealing temperature being increased by 0.4°C in each cycle.
  • the subsequent 25 cycles comprised denaturing (60 seconds, 94°C) , annealing (60 seconds, 64°C) and synthesis (120 seconds, 72°C) . Finally, a concluding synthesis of 10 minutes at 72°C was carried out.
  • the DNA fragment 1744 bp in length containing the mqo gene amplified in this manner was purified with the aid of the QIAQuick PCR Purification Kit from Qiagen (Hilden, Germany) and then digested with the restriction enzymes BamHI and EcoRI. These restriction cleavage sites were generated during the PCR with the aid of the primers YOJHI and YCHIS.
  • the digested DNA fragment was cut out of the agarose gel and purified with QIAEX II Gel Extraction Kit (155) (Hilden, Germany), mixed into the vector pUC19 treated with the restriction enzymes BamHI and EcoRI (Yanisch-Perron et al., Gene 33, 103-119, 1985) and then treated with T4 DNA ligase.
  • E. coli strain designated MC4100 ⁇ mqo which contains a deletion in the mqo gene and was prepared according to the prior art, was used as the cloning host for the transformation.
  • the mqo gene was first amplified with the aid of the primers Y_01 (SEQ ID No 9) and Y_04 (SEQ ID No 10) using whole DNA isolated from strain MC4100, with the aid of the PCR method
  • the PCR conditions comprised 30 cycles of denaturing (30 seconds, 94°C) , annealing (30 seconds, 60°C) and synthesis (2 minutes,
  • the primer Y_01 has the following sequence: 5 -GCTGGATGAATGGGCGGCGG-3
  • the primer Y_04 has the following sequence: 5 v -CGCGGATCCCCGGTTTCAACGATGATG-3
  • the amplified DNA fragment contains a cleavage site for the restriction enzyme BamHI directly after the primer Y 01.
  • the BamHI restriction cleavage site contained in the oligonucleotide primer Y_04 is identified by underlining.
  • the amplified DNA fragment was digested with BamHI and then incorporated into the BamHI cleavage site of the plasmid pK03 described by Link et al. (Journal of Bacteriology 179, 6228-6237 (1997)).
  • the resulting plasmid was designated pK03mqo and treated with the restriction enzyme Mlul in order to remove an internal DNA segment of the mqo gene 416 bp long (deletion) .
  • the plasmid pK03 ⁇ mqo obtained in this manner was used for incorporation of -the deletion ⁇ mqo in the strain MC4100.
  • the method described by Link et al (Journal of Bacteriology 179, 6228-6237 (1997)) was employed for this.
  • Plasmid pUCH2 contains a DNA fragment 1744 bp long, which codes for the malate: quinone oxidoreductase protein extended by a six-fold histidine radical on the C-terminal end.
  • the cells were then broken down twice in a precooled French Pressure Cell from Spectronic Unicam (Rochester, NY, USA) under 69 MPa (mega-Pascal) .
  • the cell debris was then sedimented twice in a centrifuge at 4°C for 10 minutes at 10000 x g.
  • the supernatant was then centrifuged for 30 minutes at 75000 x g and 4°C.
  • the membrane pellet was resuspended with the same volume of buffer B (50 mM Na phosphate, 200 mM NaCl, pH 7.5) and centrifuged again for 30 minutes at 75000 x g and 4°C.
  • the pellet was then resuspended with 1 ml buffer B.
  • the histidine-tagged malate:quinone oxidoreductase protein was purified in two steps.
  • Triton X-100 and 10 % glycerol were added to the resuspended membranes and the batch was incubated for 10 minutes on ice. The batch was then centrifuged for 30 minutes at 200000 x g at 4°C.
  • Step 2 Affinity chromatography:
  • the equilibration of the "Talon-Metal-Affinity Resin" column material ( 500 ⁇ l column volume, CLONTECH Laboratories, Palo Alto, USA) was carried out twice with 1 ml buffer B and once with 1 ml buffer C (50 mM Na phosphate, 200 mM NaCl, 0.05 % Triton X-100, 10 ⁇ M flavin adenine dinucleotide (FAD), 0.2 mg/ml phospholipid, pH 7.0).
  • the phospholipid used was L- ⁇ phosphatidylethanolamine, type IX from E.
  • step 1 The supernatant (1 ml) from step 1 was applied to the equilibrated column and incubated for 20 minutes at room temperature.
  • buffer D 50 -mM Na phosphate, 200 mM NaCl, 0.05 % Triton X-100, 10 % glycerol, 10 ⁇ M FAD, 0.2 mg/ml phospholipid, 10 mM imidazole, pH 7.0
  • buffer E 50 mM Na phosphate, 200 mM NaCl, 0.05 % Triton X-100, 10 % glycerol, 10 ⁇ M FAD, 0.2 mg/ml phospholipid, 100 mM imidazole, pH 7.0.
  • the two fractions were combined and a buffer exchange was carried out by means of an ULTRAFREE-0.5 Centrifugal Filter Device (Millipore Corporation, Bedford, MA, USA) , in order to remove the imidazole and to reduce the volume to 500 ⁇ l.
  • a second affinity chromatography was then carried out with the "Talon-Metal-Affinity Resin" column material (250 ⁇ l column volume), as described above.
  • the purified protein was stored at -20°C.
  • the purified malate: quinone oxidoreductase protein was investigated by means of SDS polyacryla ide gel electrophoresis and subsequent staining with Coomassie blue.
  • two protein bands protein B and protein C
  • the two proteins were blotted on to a polyvinylidene difluoride (PVDF) membrane (Boehringer Mannheim, Mannheim, Germany) and stained with Coomassie blue.
  • PVDF polyvinylidene difluoride
  • the N-position amino acid sequences of the malate: quinone oxidoreductase protein B and protein C were determined by Edman degradation (Edman, Molecular Biology Biochemistry Biophysics 8:211-55(1970)) by means of the automatic sequencer Procise Sequencer from PE Biosystems (Foster City, CA, USA) .
  • Edman Molecular Biology Biochemistry Biophysics 8:211-55(1970)
  • Procise Sequencer from PE Biosystems (Foster City, CA, USA) .
  • amino acid sequence L N A V S M see also SEQ ID No. 11
  • protein C the amino acid sequence A V S M A A K (see also SEQ ID No. 12) was determined.
  • Figure 1 Map of the plasmid pMW218mqo containing the mqo gene.

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Abstract

L'invention concerne un procédé de préparation de L-thréonine par fermentation au moyen d'Enterobacteriaceae, qui est particulièrement utile pour produire de la L-thréonine et dans lequel on amplifie (et, notamment, on surexpime) la ou les séquences nucléotidiques codant pour le gène mqo.
PCT/EP2001/005548 2000-07-18 2001-05-16 Procede de preparation de l-threonine par fermentation WO2002006459A1 (fr)

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AU2001265969A AU2001265969A1 (en) 2000-07-18 2001-05-16 Process for the fermentative preparation of l-threonine
EP01943376A EP1303590A1 (fr) 2000-07-18 2001-05-16 Procede de preparation de l-threonine par fermentation

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DE10034833.5 2000-07-18
DE10034833 2000-07-18
DE10103874A DE10103874A1 (de) 2000-07-18 2001-01-30 Verfahren zur fermentativen Herstellung von L-Threonin
DE10103874.7 2001-01-30

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004670A2 (fr) 2001-07-06 2003-01-16 Degussa Ag Procede de preparation de l-amino acides au moyen de souches de la famille enterobacteriaceae
US7211415B2 (en) 2003-04-09 2007-05-01 Degussa Ag Enterobacteriaceae strains over-expressing the yfiD gene for the fermentative production of L-amino acids
US7256021B2 (en) 2001-07-18 2007-08-14 Degussa Ag Enterobacteriaceae strains with an attenuated aspA gene for the fermentative production of amino acids
EP2083080A1 (fr) 2001-07-18 2009-07-29 Evonik Degussa GmbH Procédé pour la préparation d'acides L-aminés en utilisant des souches de la famille de Entérobactéries contenant le gène rseA ou rseC amélioré
US7575905B2 (en) 2004-02-06 2009-08-18 Evonik Degussa Gmbh Process for L-amino acid production using enterobacteriaceae strains with enhanced yibD
US7638313B2 (en) 2003-01-30 2009-12-29 Degussa Ag Processes for the fermentative preparation of L-threonine using strains of Escherichia in which the yjgF gene is inactivated

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WO2003004670A2 (fr) 2001-07-06 2003-01-16 Degussa Ag Procede de preparation de l-amino acides au moyen de souches de la famille enterobacteriaceae
US7256021B2 (en) 2001-07-18 2007-08-14 Degussa Ag Enterobacteriaceae strains with an attenuated aspA gene for the fermentative production of amino acids
EP2083080A1 (fr) 2001-07-18 2009-07-29 Evonik Degussa GmbH Procédé pour la préparation d'acides L-aminés en utilisant des souches de la famille de Entérobactéries contenant le gène rseA ou rseC amélioré
US7638313B2 (en) 2003-01-30 2009-12-29 Degussa Ag Processes for the fermentative preparation of L-threonine using strains of Escherichia in which the yjgF gene is inactivated
US7211415B2 (en) 2003-04-09 2007-05-01 Degussa Ag Enterobacteriaceae strains over-expressing the yfiD gene for the fermentative production of L-amino acids
US7575905B2 (en) 2004-02-06 2009-08-18 Evonik Degussa Gmbh Process for L-amino acid production using enterobacteriaceae strains with enhanced yibD

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