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Updated: Feb 13, 2026
06:36
Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
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How a Lytic Polysaccharide Monooxygenase Binds Crystalline Chitin
Bastien Bissaro1, Ingvild Isaksen1, Gustav Vaaje-Kolstad1
1Faculty of Chemistry, Biotechnology, and Food Science , Norwegian University of Life Sciences , Chr. M. Falsensvei 1 , N-1432 Aas , Norway.
Biochemistry
|March 3, 2018
Summary
Lytic polysaccharide monooxygenases (LPMOs) interact with chitin through a confined active site, enabling controlled oxidative chemistry. This study reveals the enzyme
Area of Science:
- Biochemistry and Molecular Biology
- Biotechnology and Biorefining
Background:
- Lytic polysaccharide monooxygenases (LPMOs) are crucial for biomass conversion.
- Understanding LPMO active site positioning on crystalline substrates is key to their function.
Purpose of the Study:
- To determine the binding orientation of Serratia marcescens LPMO (SmAA10A) on crystalline chitin.
- To elucidate the atomistic interactions and catalytic mechanism of SmAA10A.
Main Methods:
- Biochemical assays
- Spectroscopic techniques (EPR)
- Molecular dynamics (MD) simulations
- Quantum mechanics/molecular mechanics (QM/MM) calculations
Main Results:
- Atomistic models revealed enzyme-substrate interactions focused on the cleaved polysaccharide chain.
- A constrained active site geometry and a solvent tunnel to the copper site were identified.
- Substrate binding necessitates rearrangement of copper-coordinating water molecules, explaining C1 oxidative regiospecificity.
Conclusions:
- This study provides the first experimentally supported atomistic view of LPMO-chitin interactions.
- Active site confinement is critical for controlling LPMO oxidative chemistry.
- Findings will guide future research into LPMO mechanisms and applications.
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