摘要:
A genetic sequence coding for the production of a protein having the activity of homoserine dehydrogenase and having two Pst I cleavage sites in its DNA chain and a molecular weight of 2.24 Md, is incorporated into a vehicle capable of replication in Coryneform bacteria and used to produce L-threonine and L-isoleucine by fermentation.
摘要:
A recombinant DNA molecule comprising a plasmid vector having operationally inserted therein a gene coding for phosphoenol pyruvate carboxylase is disclosed along with bacteria containing this recombinant DNA molecule and methods of using these bacteria to produce amino acids in large quantities.
摘要:
A genetic sequence coding for the production of a protein having the activity of diaminopimelic acid decarboxylase and having two Pst I cleavage sites in its DNA chain and a molecular weight of 2.9.+-.0.05 Md, is incorporated into a vehicle capable of replication in Coryneform bacteria and used to produce L-lysine by fermentation.
摘要:
A process for producing L-tryptophan in which a suitable substrate such as a carbohydrate, indole or anthranilic acid is contacted with Coryneform bacteria, where the Coryneform bacteria bear recombinant DNA constructed by connecting a gene coding for tryptophan synthetase with a plasmid vector capable of proliferating in Coryneform bacteria.
摘要:
A substantially pure plasmid which is characterized by a molecular weight of 3.0.+-.0.1 megadalton and the restriction endonuclease-cleavage map shown in the Figure. This plasmid is capable of propagating in Corynebacteria and due to its size is useful as a vector for the cloning of exogenous genes.
摘要:
A method for producing L-tryptophan comprising culturing coryneform glutamic acid-producing bacteria transformed with an expression vector capable of replicating and expressing an operably linked anthranilic acid phosphoribosyl transferase gene isolated from a brevibacterium glutamic acid-producing bacterium, growing the transformants in culture medium allowing for the production of L-tryptophan and recovering the L-tryptophan accumulated in the culture medium.
摘要:
A recombinant DNA molecule comprising a plasmid vector having operationally inserted therein a gene coding for homoserine kinase is disclosed along with bacteria containing this recombinant DNA molecule and methods of using these bacteria to produce amino acids in large quantities.
摘要:
L-threonine is produced by incorporating into a recipient microorganism of the genus Escherichia which does not require L-threonine for growth, a plasmid, in which a deoxyribonucleic acid fragment which possesses genetic information relating to L-threonine synthesis obtained from a mutant resistant to .alpha.-amino-.beta.-hydroxy valeric acid of the genus Escherichia, has been inserted.
摘要:
The present invention relates to a process for producing an aromatic amino acid which comprises culturing a Coryneform bacterium carrying a recombinant DNA constructed by connecting (1) a gene capable of being expressed in a Coryneform bacterial cell and coding for 3-deoxy-D-arabino-heptulonic acid-7-phosphate synthetase with (2) a plasmid vector capable of propagating in a Coryneform bacterial cell.
摘要:
L-isoleucine is produced by a fermentation process comprising aerobically culturing in an aqueous culture medium an L-isoleucine producing microorganism obtained by isolating a transformed strain resistant to .alpha.-amino-.beta.-hydroxy valeric acid prepared by incorporating into a recipient strain of the genus Brevibacterium orCorynebacterium, which is sensitive to .alpha.-amino-.beta.-hydroxy valeric acid, a plasmid DNA obtained from a microorganism of the genus Brevibacterium or Corynebacterium into which has been inserted a fragment of chromosomal DNA derived from a DNA-donor strain of the genus Brevibacterium or Corynebacterium which is resistant to .alpha.-amino-.beta.-hydroxy valeric acid; and recovering L-isoleucine which accumulates in the resulting culture liquid.