title: Discrimination of aliphatic substrates by a single amino acid substitution in Bacillus badius and Bacillus sphaericus phenylalanine dehydrogenases.
abstract: Replacement of glycine by serine at positions 123 and 124 of phenylalanine dehydrogenases from Bacillus badius and Bacillus sphaericus respectively strikingly decreased enzyme activity toward aromatic amino acids and resulted in an elevation of relative activity toward aliphatic amino acids. The mutant from B. badius preferentially dehydrogenated branched-chain amino acids, while that from B. sphaericus acted on amino acids with straight-chain amino acids.
authors.affiliation: Biotechnology Research Center, Toyama Prefectural University, Imizu, Toyama, Japan.
authors.forename: Shinjiro
authors.initials: S
authors.lastname: Tachibana
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kuwamori
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Asano
mesh_terms: D000429:Alcohol Oxidoreductases / Q000235:genetics* / Q000378:metabolism*; D019943:Amino Acid Substitution; D000596:Amino Acids / Q000737:chemistry* / Q000378:metabolism*; D001407:Bacillus / Q000201:enzymology*; D007700:Kinetics; D009154:Mutation; D013379:Substrate Specificity
chemical_list: D000596:Amino Acids; D000429:Alcohol Oxidoreductases; C086412:phenylserine dehydrogenase (NADP+)