摘要:
The invention relates to L-lysine-producing strains of corynebacteria with enhanced lysE gene (lysine export carrier gene), in which strains additional genes chosen from the group comprising the dapA gene (dihydrodipicolinate synthase gene), the lysC gene (aspartate kinase gene), the dapB gene (dihydrodipicolinate reductase gene) and the pyc gene, but especially the dapA gene and the lysC gene (aspartate kinase gene), are enhanced and, in particular, over-expressed, and to a process for the preparation of L-lysine.
摘要:
The invention relates to L-lysine-producing strains of corynebacteria with amplified lysE gene (lysine export carrier gene), in which strains additional genes chosen from the group comprising the dapA gene (dihydrodipicolinate synthase gene), the lysC gene (aspartate kinase gene), the dapB gene (dihydrodipicolinate reductase gene) and the pyc gene, but especially the dapA gene and the lysC gene (aspartate kinase gene), are amplified and, in particular, overexpressed, and to a process for the preparation of L-lysine.
摘要:
Mutagenesis of the gene encoding homoserine dehydrogenase (hom) for production of the amino acid threonine is described. The mutation causes an alteration in the carboxy terminus of the enzyme that interferes with end-product inhibition by threonine. The lack of end-product inhibition causes an overproduction of threonine.
摘要:
The invention relates to a process for the fermentative preparation of L-threonine in which an L-threonine-producing microorganism of the Enterobacteriaceae family is cultured by the feed process, and a portion of the fermentation broth is then separated off in order to be utilized for inoculation of further media.
摘要:
The present invention provides an isolated DNA molecule encoding a small subunit of acetohydroxy acid synthase isozyme III originating from Escherichia coli and mutants of Escherichia coli acetohydroxy acid synthase isozyme III, which are free from inhibition by L-valine an can catalyze the conversion of: (a) pyruvate to &agr;-acetolactate and (b) &agr;-ketobutyrate and pyruvate to &agr;-aceto-a-hydroxybutyrate. The present invention also provides methods for producing L-valine by fermentation of a bacterium harboring the novel DNA molecule and/or expressing the mutant acetohydroxy acid synthase isozyme III.
摘要:
The present application is directed to a diaminopimelate epimerase from Corynebacterium glutamicum and to polynucleotides encoding this enzyme. The gene has been given the designation “dapF.”
摘要:
A recombinant DNA autonomously replicable in cells of coryneform bacteria, comprising a DNA sequence coding for an aspartokinase in which feedback inhibition by L-lysine and L-threonine is substantially desensitized, and a DNA sequence coding for a diaminopimelate decarboxylase; a coryneform bacterium harboring an aspartokinase in which feedback inhibition by L-lysine and L-threonine is substantially desensitized, and comprising an enhanced DNA sequence coding for a diaminopimelate decarboxylase; and a method for producing L-lysine comprising the steps of cultivating the coryneform bacterium in an appropriate medium to allow L-lysine to be produced and accumulated in a culture of the bacterium, and collecting L-lysine from the culture.
摘要:
This invention relates to novel polynucleotide sequences encoding the histidine kinase luminescence expression sensor (luxS) gene from Corynebaclerium glutamicum, probes to the novel polynucleotide sequences encoding the luxS gene, vector and host cells containing the novel luxS polynucleotide sequences, the encoded Lux S polypeptide, and a process for the fermentative preparation of amino acids using bacteria which the luxS gene is attenuated.
摘要:
The invention relates to an isolated polynucleotide comprising a polynucleotide sequence chosen from the group consisting of a) polynucleotide which is identical to the extent of at least 70% to a polynucleotide which codes for a polypeptide which comprises the amino acid sequence of SEQ ID NO 2, b) polynucleotide which codes for a polypeptide which comprises an amino acid sequence which is identical to the extent of at least 70% to the amino acid sequence of SEQ ID NO 2 c) polynucleotide which is complementary to the polynucleotides of a) and b) and d) polynucleotide comprising at least 15 successive nucleotides of the polynucleotide sequence of a), b) or c), and processes for the fermentative preparation of L-amino acid with amplification of the zwa1 gene in the coryneform bacteria employed.
摘要翻译:本发明涉及一种分离的多核苷酸,其包含选自以下的多核苷酸序列:a)与编码多肽的多核苷酸的程度相同的多核苷酸,所述多核苷酸包含氨基酸序列 b)编码多肽的多核苷酸,其包含与SEQ ID NO 2的氨基酸序列至少70%的程度相同的氨基酸序列,c) 与a)和b)和d)多核苷酸互补的多核苷酸,其包含a),b)或c),/或PTEXT的多核苷酸序列的至少15个连续核苷酸的多核苷酸,以及发酵 在使用棒状细菌中扩增zwa1基因的L-氨基酸的制备
摘要:
A microorganism, which has an ability to produce L-amino acid, especially L-phenylalanine, L-tryptophane, L-tyrosine, L-threonine, or L-isoleucine, in which a phosphoenolpyruvate-producing ability is enhanced, is cultivated in a medium so that the L-amino acid is produced and accumulated in the medium to collect the L-amino acid.