title: l-Serine Production by a Mutant of Sarcina albida Defective in l-Serine Degradation.
abstract: For improved l-serine production, an l-serine dehydratase-defective mutant of Sarcina albida IAM 1012 was obtained. In the mutant, the activities of the enzymes responsible for l-serine production were as high as those in the parent strain, and, at a low glycine concentration, the mutant accumulated l-serine more efficiently than the parent. Under optimum conditions, 21 mg of l-serine per ml accumulated from 100 mg of glycine per ml. l-Serine was isolated from a reaction mixture as l-serine m-xylene-4-sulfonate, and free amino acid was obtained in high yields by use of an ion-exchange resin. Residual glycine was recovered at a yield of 61%.
authors.affiliation: Research Laboratory of Applied Biochemistry, Tanabe Seiyaku Co., Ltd., Kashima, Yodogawa-ku, Osaka, 532 Japan.
authors.forename: K
authors.initials: K
authors.lastname: Omori
authors.forename: T
authors.initials: T
authors.lastname: Kakimoto
authors.forename: I
authors.initials: I
authors.lastname: Chibata