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FEBS Lett. 2016 Jan;590(1):34-42. doi: 10.1002/1873-3468.12025. Epub 2015 Dec 28.

Structural and functional characterization of a small chitin-active lytic polysaccharide monooxygenase domain of a multi-modular chitinase from Jonesia denitrificans.

Author information

1
Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, Norway.
2
Department of Medical Biochemistry, Institute for Clinical Medicine, University of Oslo, Norway.
3
Department of Microbiology, Clinic for Diagnostics and Intervention, Oslo University Hospital, Rikshospitalet, Norway.
4
Bioscience Division, Protein Crystallography Station, Los Alamos National Laboratory, NM, USA.
5
Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, St. Paul, MN, USA.

Abstract

Lytic polysaccharide monooxygenases (LPMOs) boost enzymatic depolymerization of recalcitrant polysaccharides, such as chitin and cellulose. We have studied a chitin-active LPMO domain (JdLPMO10A) that is considerably smaller (15.5 kDa) than all structurally characterized LPMOs so far and that is part of a modular protein containing a GH18 chitinase. The 1.55 Å resolution structure revealed deletions of interacting loops that protrude from the core β-sandwich scaffold in larger LPMO10s. Despite these deletions, the enzyme is active on alpha- and beta-chitin, and the chitin-binding surface previously described for larger LPMOs is fully conserved. JdLPMO10A may represent a minimal scaffold needed to catalyse the powerful LPMO reaction.

KEYWORDS:

AA10; Jonesia denitrificans; chitin; chitinase; lytic polysaccharide monooxygenase

PMID:
26763108
DOI:
10.1002/1873-3468.12025
[Indexed for MEDLINE]
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