title: Crystal structures of chitin binding domains of chitinase from Thermococcus kodakarensis KOD1.
abstract: Chitinase from T. kodakarensis (TkChiA) catalyzes the hydrolysis of chitin. The enzyme consists of two catalytic and three binding domains (ChBD1, ChBD2 and ChBD3). ChBD2 and ChBD3 can bind to not only chitin but also cellulose. In both domains, the intervals of the side chains of the three tryptophan residues, which are located on the molecular surface, correspond to twice the length of the lattice of the chitin. A binding model with crystalline chitin implies that the tryptophan residues and a glutamate residue interact with the hexose ring by CH-π interactions and the amide group by a hydrogen bond, respectively.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Hanazono
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Takeda
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Japan.
authors.forename: Satomi
authors.initials: S
authors.lastname: Niwa
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Japan.
authors.forename: Masahito
authors.initials: M
authors.lastname: Hibi
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Takahashi
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan.|CREST/JST, Chiyoda-ku, Tokyo, Japan.
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kanai
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan.|CREST/JST, Chiyoda-ku, Tokyo, Japan.
authors.forename: Haruyuki
authors.initials: H
authors.lastname: Atomi
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Japan.|CREST/JST, Chiyoda-ku, Tokyo, Japan.
authors.forename: Kunio
authors.initials: K
authors.lastname: Miki
mesh_terms: D000595:Amino Acid Sequence; D002686:Chitin / Q000737:chemistry* / Q000378:metabolism; D002688:Chitinases / Q000737:chemistry* / Q000378:metabolism; D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D004591:Electrophoresis, Polyacrylamide Gel; D008958:Models, Molecular; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D019712:Thermococcus / Q000201:enzymology*
chemical_list: D002686:Chitin; D002688:Chitinases
keywords: CH-π interaction; X-ray analysis; chitinase from Thermococcus kodakarensis; circular dichroism spectroscopy; crystalline chitin