WO2005103228B1 - L-amino acid-producing bacterium and a method for producing l-amino acid - Google Patents

L-amino acid-producing bacterium and a method for producing l-amino acid

Info

Publication number
WO2005103228B1
WO2005103228B1 PCT/JP2005/008402 JP2005008402W WO2005103228B1 WO 2005103228 B1 WO2005103228 B1 WO 2005103228B1 JP 2005008402 W JP2005008402 W JP 2005008402W WO 2005103228 B1 WO2005103228 B1 WO 2005103228B1
Authority
WO
WIPO (PCT)
Prior art keywords
strain
amino acid
producing
valine
tryptophan
Prior art date
Application number
PCT/JP2005/008402
Other languages
French (fr)
Other versions
WO2005103228A2 (en
WO2005103228A3 (en
Filing date
Publication date
Application filed filed Critical
Priority to AT05737046T priority Critical patent/ATE557096T1/en
Priority to DK05737046.2T priority patent/DK1740694T3/en
Priority to CN2005800200952A priority patent/CN1969038B/en
Priority to EP05737046A priority patent/EP1740694B1/en
Priority to BRPI0509982A priority patent/BRPI0509982B1/en
Publication of WO2005103228A2 publication Critical patent/WO2005103228A2/en
Publication of WO2005103228A3 publication Critical patent/WO2005103228A3/en
Publication of WO2005103228B1 publication Critical patent/WO2005103228B1/en

Links

Abstract

An L-amino acid-producing strain of Escherichia coli is bred by modifying an Escherichia coli K12 strain or a derivative thereof so as to become resistant to L-valine and have an ability to produce one or more L-amino acids selected from the group consisting of L-tryptophan, L-phenylalanine, L-lysine, L-tyrosine, L-glutamic acid, L-histidine, L-cysteine, and L-proline.

Claims

27AMENDED CLAIMS[received by the International Bureau on 06 January 2006 (06.01.2006)]
1. An isolated strain of Escherichia coli obtainable by modifying an Escherichia coli K12 strain or a derivative thereof, wherein said isolated strain is resistant to L-valine and has an ability to produce L-tryptophan.
2. The strain according to claim 1, wherein said strain has an ability to grow in a medium containing 20 mg/L of L-valine.
3. The strain according to claim 1, wherein said isolated strain is modified to be L-valine-resistant by enhancing an intracellular acetohydroxy acid synthase activity so that it is higher than that of a non-modified Kl 2 strain.
4. The isolated strain according to claim 3, wherein said isolated strain is modified so as to produce active acetohydroxy acid synthase II.
5. The isolated strain according to claim 4, wherein said active acetohydroxy acid synthase II is a protein encoded by a gene comprising a nucleotide sequence of SEQ ID NO: 3 or 5.
6. A method for producing L-tryptophan, comprising culturing the strain as defined in any one of claims 1 to 5 in a medium, and collecting L-tryptophan from the medium or bacterial cells.
PCT/JP2005/008402 2004-04-26 2005-04-26 L-amino acid-producing bacterium and a method for producing l-amino acid WO2005103228A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT05737046T ATE557096T1 (en) 2004-04-26 2005-04-26 L-TRYPTOPHAN PRODUCING BACTERIA AND METHOD FOR PRODUCING L-TRYPTOPHAN
DK05737046.2T DK1740694T3 (en) 2004-04-26 2005-04-26 L-tryptophan-producing bacterium and method for producing L-tryptophan
CN2005800200952A CN1969038B (en) 2004-04-26 2005-04-26 L-amino acid-producing bacterium and method for producing L-amino acid
EP05737046A EP1740694B1 (en) 2004-04-26 2005-04-26 L-tryptophan-producing bacterium and a method for producing l-tryptophan
BRPI0509982A BRPI0509982B1 (en) 2004-04-26 2005-04-26 method for producing l-tryptophan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-130088 2004-04-26
JP2004130088 2004-04-26

Publications (3)

Publication Number Publication Date
WO2005103228A2 WO2005103228A2 (en) 2005-11-03
WO2005103228A3 WO2005103228A3 (en) 2006-03-02
WO2005103228B1 true WO2005103228B1 (en) 2006-04-20

Family

ID=34966388

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/008402 WO2005103228A2 (en) 2004-04-26 2005-04-26 L-amino acid-producing bacterium and a method for producing l-amino acid

Country Status (7)

Country Link
US (1) US7300776B2 (en)
EP (1) EP1740694B1 (en)
CN (1) CN1969038B (en)
AT (1) ATE557096T1 (en)
BR (1) BRPI0509982B1 (en)
DK (1) DK1740694T3 (en)
WO (1) WO2005103228A2 (en)

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