title: Purification and characterization of Vibrio parahaemolyticus extracellular chitinase and chitin oligosaccharide deacetylase involved in the production of heterodisaccharide from chitin.
abstract: A chitin-degrading bacterial strain, KN1699, isolated from Yatsu dry beach (Narashino, Chiba Prefecture, Japan), was identified as Vibrio parahaemolyticus. Treatment of powdered chitin with crude enzyme solution prepared from the supernatant of KN1699 cultures yielded a disaccharide, beta-D-N-acetylglucosaminyl-(1,4)-D-glucosamine (GlcNAc-GlcN), as the primary chitin degradation product. The extracellular enzymes involved in the production of this heterodisaccharide, chitinase (Pa-Chi; molecular mass, 92 kDa) and chitin oligosaccharide deacetylase (Pa-COD; molecular mass, 46 kDa), were isolated from the crude enzyme solution, and their hydrolysis specificities were elucidated. These studies confirmed that (1) Pa-Chi hydrolyzes chitin to produce (GlcNAc)(2) and (2) Pa-COD hydrolyzes the acetamide group of reducing end GlcNAc residue of (GlcNAc)(2). These findings indicate that GlcNAc-GlcN is produced from chitin by the cooperative hydrolytic reactions of both Pa-Chi and Pa-COD.
authors.affiliation: Department of Biological Chemistry, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, 252-8510, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kadokura
authors.forename: A
authors.initials: A
authors.lastname: Rokutani
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Ikegami
authors.forename: H
authors.initials: H
authors.lastname: Sugita
authors.forename: S
authors.initials: S
authors.lastname: Itoi
authors.forename: W
authors.initials: W
authors.lastname: Hakamata
authors.forename: T
authors.initials: T
authors.lastname: Oku
authors.forename: T
authors.initials: T
authors.lastname: Nishio
mesh_terms: D000117:Acetylglucosamine / Q000096:biosynthesis / Q000737:chemistry; D000581:Amidohydrolases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D000595:Amino Acid Sequence; D001709:Biotechnology / Q000379:methods; D002686:Chitin / Q000378:metabolism*; D002688:Chitinases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D004187:Disaccharides / Q000096:biosynthesis*; D007564:Japan; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000378:metabolism*; D012988:Soil Microbiology; D013379:Substrate Specificity; D014736:Vibrio parahaemolyticus / Q000145:classification / Q000201:enzymology* / Q000235:genetics / Q000302:isolation & purification
chemical_list: D004187:Disaccharides; D009844:Oligosaccharides; D002686:Chitin; D002688:Chitinases; D000581:Amidohydrolases; C019866:chitin deacetylase; D000117:Acetylglucosamine