title: D-Amino acid dipeptide production utilizing D-alanine-D-alanine ligases with novel substrate specificity.
abstract: D-Alanine-D-alanine ligase (Ddl) is an important enzyme in the synthesis of bacterial peptidoglycan. The genes encoding Ddls from Escherichia coli K12 (EcDdlB), Oceanobacillus iheyensis JCM 11309 (OiDdl), Synechocystis sp. PCC 6803 (SsDdl) and Thermotoga maritima ATCC 43589 (TmDdl), the genomic DNA sequences of which have been determined, were cloned and the substrate specificities of these recombinant Ddls were investigated. Although OiDdl had a high substrate specificity for D-alanine; EcDdlB, SsDdl and TmDdl showed broad substrate specificities for D-serine, D-threonine, D-cysteine and glycine, in addition to D-alanine. Four D-amino acid dipeptides were produced using EcDdlB, and D-amino acid homo-dipeptides were successfully produced at high yields except for D-threonyl-D-threonine.
authors.affiliation: Department of Applied Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku 169-8555, Tokyo, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Sato
authors.forename: Kohtaro
authors.initials: K
authors.lastname: Kirimura
authors.forename: Kuniki
authors.initials: K
authors.lastname: Kino
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D004151:Dipeptides / Q000737:chemistry* / Q000378:metabolism*; D004789:Enzyme Activation; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010453:Peptide Synthases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D015202:Protein Engineering / Q000379:methods*; D011994:Recombinant Proteins / Q000378:metabolism; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D004151:Dipeptides; D011994:Recombinant Proteins; D010453:Peptide Synthases; C019638:D-alanylalanine synthetase