The present invention provides a method for industrially producing an optically active lysine derivative useful as a pharmaceutical intermediate. More particularly, the present invention provides a production method including protecting an amino group or an amino group and carboxyl group of optically active 2-amino-6-methyl-6-nitroheptanoic acid with a protecting group, reducing a nitro group to synthesize a 6,6-dimethyl lysine derivative and reacting the 6,6-dimethyl lysine derivative with an acetic acid derivative.
DNA for encoding D-hydantoin hydrolases, DNA for encoding N-carbamyl-D-amino acid hydrolases, recombinant DNA containing the genes, cells transformed with the recombinant DNA, methods for producing proteins utilizing the transformed cells and methods for producing D-amino acids
申请人:Ajinomoto Co., Inc.
公开号:US20030113880A1
公开(公告)日:2003-06-19
DNA for encoding a protein having D-hydantoinase activity which has a base sequence represented by Sequence ID No. 1 in the Sequence Listing. DNA for encoding a protein having D-carbamylase activity which has a base sequence represented by Sequence ID No. 3 in the Sequence Listing.
Methods for producing single diastereomers of isoleucine in high stereochemical purity are provided. D-isoleucine is produced by converting (R)-2-methylbutyraldehyde to a diastereomeric mixture of D-isoleucine hydantoin and L-allo-isoleucine hydantoin (5S-[(R)-1-methylpropyl]hydantoin) under conditions whereby no significant racemization of the chiral center in (R)-2-methylbutyraldehyde occurs, followed by contacting said diastereomeric hydantoin mixture with a D-hydantoinase to stereoselectively hydrolyze any D-isoleucine hydantoin in the mixture to the corresponding N-carbamoyl-D-isoleucine, preferably under conditions permitting the simultaneous epimerization of the chiral center at C-5 of the hydantoin. The simultaneous epimerization permits the reaction to be carried out to substantial completion so that the diastereomeric hydantoin mixture is converted to N-carbamoyl-D-isoleucine in high yield. The N-carbamoyl-D-isoleucine is then decarbamoylated to produce D-isoleucine. Similar procedures are used to produce single diastereomers of L-isoleucine, L-allo-isoleucine, and D-allo-isoleucine.
Recombinant D-hydantoin hydrolases and N-carbamyl-D-amino acid hydrolases, and DNA encoding them; uses thereof for producing D-amino acids
申请人:Ajinomoto Co., Inc.
公开号:EP1275723A1
公开(公告)日:2003-01-15
DNA for encoding a protein having D-hydantoinase activity which has a base sequence represented by Sequence ID No.1 in the Sequence Listing. DNA for encoding a protein having D-carbamylase activity which has a base sequence represented by Sequence ID No. 3 in the Sequence Listing.
用于编码具有 D-海因酶活性的蛋白质的 DNA,其碱基序列由序列表中序列 ID No.1 代表。用于编码具有 D-氨基甲酰酶活性的蛋白质的 DNA,其碱基序列由序列表中序列 ID No.