Method of constructing amino acid producing bacterial strains, and method of preparing amino acids by fermentation with the constructed amino acid producing bacterial strains
First Claim
1. A method of producing L-glutamic acid, comprising:
- culturing a coryneform bacterium expressing an enzyme encoded by a coryneform bacteria glutamic acid biosynthesizing gene, in a medium for a time and under conditions suitable to produce and accumulate said L-glutamic acid in the medium, and collecting said L-glutamic acid from the medium;
wherein the glutamic acid biosynthesizing gene is located on a chromosome of the coryneform bacterium and the enzyme is selected from the group consisting of glutamate dehydrogenase, citrate synthase, isocitrate dehydrogenase, pyruvate dehydrogenase, and aconitase, said glutamic acid biosynthesizing gene comprising a DNA sequence situated at about position −
35 from the transcription start site of the glutamic acid biosynthesizing gene, wherein said DNA sequence is selected from the group consisting of TTGTCA and TTGCCA, wherein said producing L-glutamic acid is at a level greater than the production of L-glutamic acid by the corresponding wild-type coryneform bacterium.
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Abstract
A method of producing coryneform bacteria having improved amino acid or nucleic acid productivity comprising the steps of introducing a mutation in a promoter sequence of amino acid- or nucleic acid-biosynthesizing genes on a chromosome of a coryneform bacterium to make it close to a consensus sequence, or introducing a change in a promoter sequence of amino acid- or nucleic acid-biosynthesizing genes on a chromosome of a coryneform bacterium by gene recombination to make it close to a consensus sequence, to obtain mutants of the coryneform amino acid- or nucleic acid-producing microorganism, culturing the mutants and selecting a mutant capable of producing the intended amino acid or nucleic acid in a large amount. This method allows the construction of a mutant capable of enriching or controlling the expression of an intended gene without using a plasmid and to promote production of amino acids in a high yield by recombination or mutation.
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Citations
26 Claims
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1. A method of producing L-glutamic acid, comprising:
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culturing a coryneform bacterium expressing an enzyme encoded by a coryneform bacteria glutamic acid biosynthesizing gene, in a medium for a time and under conditions suitable to produce and accumulate said L-glutamic acid in the medium, and collecting said L-glutamic acid from the medium;
wherein the glutamic acid biosynthesizing gene is located on a chromosome of the coryneform bacterium and the enzyme is selected from the group consisting of glutamate dehydrogenase, citrate synthase, isocitrate dehydrogenase, pyruvate dehydrogenase, and aconitase, said glutamic acid biosynthesizing gene comprising a DNA sequence situated at about position −
35 from the transcription start site of the glutamic acid biosynthesizing gene, wherein said DNA sequence is selected from the group consisting of TTGTCA and TTGCCA,wherein said producing L-glutamic acid is at a level greater than the production of L-glutamic acid by the corresponding wild-type coryneform bacterium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of producing L-glutamic acid, comprising:
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culturing a coryneform bacterium expressing an enzyme encoded by a coryneform bacteria glutamic acid biosynthesizing gene, in a medium for a time and under conditions suitable to produce and accumulate said L-glutamic acid in the medium, and collecting said L-glutamic acid from the medium;
wherein the glutamic acid biosynthesizing gene is located on a chromosome of the coryneform bacterium and the enzyme is selected from the group consisting of glutamate dehydrogenase, citrate synthase, isocitrate dehydrogenase, pyruvate dehydrogenase, and aconitase, said glutamic acid biosynthesizing gene comprising a DNA sequence situated at about position −
10 from the transcription start site of the glutamic acid biosynthesizing gene, wherein said DNA sequence is TATAAC,wherein said producing L-glutamic acid is at a level greater than the production of L-glutamic acid by the corresponding wild-type coryneform bacterium. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification