摘要:
The present invention relates to a Tryptophan-producing E. coli mutant strain CJ285 (KCCM-10534) containing single or multi mutant genes related with Tryptophan biosynthesis and production method of Tryptophan using the same. More particularly, DNA base sequences and amino acid sequences aroF, aroG, trpR, and tyrR originated from tryptophan producing E. coli mutant strain CJ285 (KCCM-10534) and related with Tryptophan biosynthesis, are disclosed, and E. coli CJ285 containing at least one of the mutant genes is cultivated directly in a glucose-containing fermentation medium, whereby L-tryptophan can be accumulated in the culture medium.
摘要:
The present invention provides a method for producing an aromatic L-amino acid using a bacterium of the Enterobacteriaceae family, particularly a bacterium belonging to genus Escherichia or Pantoea, which has been modified to attenuate expression of the ydiN gene, the ydiB gene, or both.
摘要:
The invention relates to mutants and alleles of the gnd gene from coryneform bacteria coding for 6-phosphogluconate dehydrogenases which contain at position 329 or a comparable position of the amino acid sequence any amino acid other than L-valine, and to processes for the production of amino acids, preferably L-lysine and L-tryptophan, by fermentation using bacteria that contain these alleles.
摘要:
The invention relates to a method for producing L-amino acids in which the following steps are carried out: a) the recombinant coryneform bacteria which produce the desired L-amino acid and in which at least one or several of the heterologous polynucleotides of the glycerol metabolism, selected among the group comprising glpA, glpB, glpC, glpD, glpE, glpF, glpG, glpK, glpQ, glpT, glpX, gldA, dhaK, dhaL, dhaM, dhaR, fsa, and talC, is/are expressed are cultivated in a medium containing glycerol or one or several other optional C sources in conditions in which the desired L-amino acid is enriched in the medium or the cells; and, optionally, b) the desired L-amino acid is isolated, all or fractions (>0 to 100 percent) of the components of the fermentation broth and/or biomass optionally remaining in the final product. In said method, bacteria are used in which other genes of the biosynthesis pathway of the desired L-amino acid are additionally reinforced or in which the metabolism pathways reducing the formation of the desired L-amino acid are eliminated at least in part.
摘要:
The present invention relates to a novel obligately symbiotic thermophile Symbiobacterium toebii SC-1 (Accession NO: KCTC 0685BP), and a thermostable L-tyrosine phenol-lyase and L-tryptophan indole-lyase produced by Symbiobacterium toebii SC-1. The present invention also relates to a pure culture method of Symbiobacterium toebii SC-1, a method of growth measurement for Symbiobacterium toebii SC-1 and its relative symbiotic bacteria showing low-growth yield using nitrate respiration, and a screening method of relative symbiotic strains of Symbiobacterium toebii SC-1 from the environment using a specific antibody to it. Therefore, the thermostable L-tyrosine phenol-lyase and L-tryptophan indole-lyase produced by Symbiobacterium toebii SC-1 in this invention can provide more stable catalysts in enzymatic biotransformation processes which enzymatically produce valuable medico-amino acids 3,4-dehydroxy-L-phenylalanine (L-DOPA) and L-tryptophan.
摘要翻译:本发明涉及一种新型的共生共生嗜热ile ile i i i i i i i i))i i i i i i i i i i i i i i i i i。。。。。。。。。。。。。。。。。。。。 本发明还涉及使用硝酸盐呼吸的共生杆菌SC-1的纯培养方法,使用硝酸盐呼吸显示低生长产量的共生杆菌SC-1及其相对共生菌的生长方法,以及相对共生菌株的筛选方法 的来自环境的共表达杆菌SC-1使用特异性抗体。 因此,在本发明中由共生杆菌(Toibii)SC-1产生的热稳定性L-酪氨酸苯酚裂解酶和L-色氨酸吲哚裂解酶可以在酶生物转化过程中提供更稳定的催化剂,其中酶促产生有价值的羟基 - 氨基酸3,4-脱羟基 - L-苯丙氨酸(L-DOPA)和L-色氨酸。
摘要:
The invention relates to mutants and alleles of the zwf gene of coryneform bacteria, which encode variants of the Zwf subunit of glucose 6-phosphate dehydrogenase (EC: 1.1.1.49), and to processes for preparing amino acids, in particular L-lysine and L-tryptophan, by using bacteria which harbor said alleles.
摘要:
The invention related to an isolated nucleic acid consisting of a fragment of the polynucleotide of Corynebacterium glutamicum citA gene or a fragment of the full complement of the polynucleotide of the C. glutamicum citA gene wherein said fragment is at least 30 consecutive nucleotide in length, and the vector and host cell harboring these nucleic acids.
摘要:
Isolated nucleic acid molecules, designated MCP nucleic acid molecules, which encode novel MCP proteins from Corynebacterium glutamicum are described. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing MCP nucleic acid molecules, and host cells into which the expression vectors have been introduced. The invention still further provides isolated MCP proteins, mutated MCP proteins, fusion proteins, antigenic peptides and methods for the improvement of production of a desired compound from C. glutamicum based on genetic engineering of MCP genes in this organism.
摘要:
The invention relates to mutants and alleles of the gnd gene from coryneform bacteria coding for 6-phosphogluconate dehydrogenases which contain at position 329 or a comparable position of the amino acid sequence any amino acid other than L-valine, and to processes for the production of amino acids, preferably L-lysine and L-tryptophan, by fermentation using bacteria that contain these alleles.
摘要:
Isolated nucleic acid molecules, designated SRT nucleic acid molecules, which encode novel SRT proteins from Corynebacterium glutamicum are described. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing SRT nucleic acid molecules, and host cells into which the expression vectors have been introduced. The invention still further provides isolated SRT proteins, mutated SRT proteins, fusion proteins, antigenic peptides and methods for the improvement of production of a desired compound from C. glutamicum based on genetic engineering of SRT genes in this organism.