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Structure of a two-domain chitotriosidase from Serratia marcescens at 1.9-A resolution.

ABSTRACT: In this paper, we describe the structure of chitinase B from Serratia marcescens, which consists of a catalytic domain with a TIM-barrel fold and a 49-residue C-terminal chitin-binding domain. This chitinase is the first structure of a bacterial exochitinase, and it represents one of only a few examples of a glycosyl hydrolase structure having interacting catalytic and substrate-binding domains. The chitin-binding domain has exposed aromatic residues that contribute to a 55-A long continuous aromatic stretch extending into the active site. Binding of chitin oligomers is blocked beyond the -3 subsite, which explains why the enzyme has chitotriosidase activity and degrades the chitin chain from the nonreducing end. Comparison of the chitinase B structure with that of chitinase A explains why these enzymes act synergistically in the degradation of chitin.

SUBMITTER: van Aalten DM

PROVIDER: S-EPMC18521 | biostudies-literature | 2000 May

REPOSITORIES: biostudies-literature

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Structure of a two-domain chitotriosidase from Serratia marcescens at 1.9-A resolution.

van Aalten D M DM Synstad B B Brurberg M B MB Hough E E Riise B W BW Eijsink V G VG Wierenga R K RK

Proceedings of the National Academy of Sciences of the United States of America 20000501 11

In this paper, we describe the structure of chitinase B from Serratia marcescens, which consists of a catalytic domain with a TIM-barrel fold and a 49-residue C-terminal chitin-binding domain. This chitinase is the first structure of a bacterial exochitinase, and it represents one of only a few examples of a glycosyl hydrolase structure having interacting catalytic and substrate-binding domains. The chitin-binding domain has exposed aromatic residues that contribute to a 55-A long continuous aro ...[more]

PMID: 10823940

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