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• W2791907380 abstract "Chitinase D (designated as Pc-ChiD) was found in a hyperthermophilic archaeon, Pyrococcus chitonophagus (previously described as Thermococcus chitonophagus), that was isolated from media containing only chitin as carbon source. Pc-ChiD displays chitinase activity and is thermostable at temperatures up to 95°C, suggesting its potential for industrial use. Pc-ChiD has a secretion signal peptide and two chitin-binding domains (ChBDs) in the N-terminal domain. However, the C-terminal domain shares no sequence similarity with previously identified saccharide-degrading enzymes and does not contain the DXDXE motif conserved in the glycoside hydrolase (GH) 18 family chitinases. To elucidate its overall structure and reaction mechanism, we determined the first crystal structures of Pc-ChiD, both in the ligand-free form and in complexes with substrates. Structure analyses revealed that the C-terminal domain of Pc-ChiD, Pc-ChiD(ΔBD), consists of a third putative substrate-binding domain, which cannot be predicted from the amino acid sequence, and a catalytic domain structurally similar to that found in not the GH18 family but the GH23 family. Based on the similarity with GH23 family chitinase, the catalytic residues of Pc-ChiD were predicted and confirmed by mutagenesis analyses. Moreover, the specific C-terminal 100 residues of Pc-ChiD are important to fix the putative substrate-binding domain next to the catalytic domain, contributing to the structure stability as well as the long chitin chain binding. Our findings reveal the structure of a unique archaeal chitinase that is distinct from previously known members of the GH23 family." @default.
• W2791907380 created "2018-03-29" @default.
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• W2791907380 date "2018-03-21" @default.
• W2791907380 modified "2023-10-03" @default.
• W2791907380 title "Crystal structures of an archaeal chitinase ChiD and its ligand complexes" @default.
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• W2791907380 doi "https://doi.org/10.1093/glycob/cwy024" @default.
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• W2791907380 hasPublicationYear "2018" @default.
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