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Title: Molecular mechanism of the chitinolytic peroxygenase reaction

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Significance Biomass decomposition by microorganisms relies on a battery of enzymes, of which lytic polysaccharide monooxygenases (LPMOs) constitute a central player. LPMOs are notably able to disrupt the abundant recalcitrant carbohydrates cellulose and chitin and thus increase the overall rate of their degradation. It has recently been demonstrated that LPMOs prefer hydrogen peroxide over molecular oxygen to oxidize and cleave their substrates. Here, we explain through molecular simulations and experiments how a chitin-active LPMO activates hydrogen peroxide and catalyzes substrate hydrogen abstraction. Thereby, we reveal the molecular details of this unusual bioinorganic chemistry, which is of high relevance for the understanding of pathogenesis-defense mechanisms and biomass turnover.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1581447
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 3 Vol. 117; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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