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Structural basis for cellobiose dehydrogenase action during oxidative cellulose degradation

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8542· OSTI ID:1623985
 [1];  [2];  [3];  [2];  [2];  [2];  [4];  [2];  [3]
  1. KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology; Karolinska Inst., Stockholm (Sweden). Dept. of Medical Biochemistry; DOE/OSTI
  2. Univ. of Natural Resources and Life Sciences, Vienna (Austria). Food Biotechnology Lab. Dept. of Food Science and Technology
  3. KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology; Karolinska Inst., Stockholm (Sweden). Dept. of Medical Biochemistry
  4. Karolinska Inst., Stockholm (Sweden). Dept. of Cell and Molecular Biology; European Molecular Biology Lab. (EMBL), Hamburg (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Centre for Structural Systems Biology
A new paradigm for cellulose depolymerization by fungi focuses on an oxidative mechanism involving cellobiose dehydrogenases (CDH) and copper-dependent lytic polysaccharide monooxygenases (LPMO); however, mechanistic studies have been hampered by the lack of structural information regarding CDH. CDH contains a haem-binding cytochrome (CYT) connected via a flexible linker to a flavin-dependent dehydrogenase (DH). Electrons are generated from cellobiose oxidation catalysed by DH and shuttled via CYT to LPMO. Here we present structural analyses that provide a comprehensive picture of CDH conformers, which govern the electron transfer between redox centres. Using structure-based site-directed mutagenesis, rapid kinetics analysis and molecular docking, we demonstrate that flavin-to-haem interdomain electron transfer (IET) is enabled by a haem propionate group and that rapid IET requires a closed CDH state in which the propionate is tightly enfolded by DH. Following haem reduction, CYT reduces LPMO to initiate oxygen activation at the copper centre and subsequent cellulose depolymerization.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1623985
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Direct Electron Transfer of Enzymes Facilitated by Cytochromes journal December 2018
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Molecular Mechanisms of Oxygen Activation and Hydrogen Peroxide Formation in Lytic Polysaccharide Monooxygenases journal April 2019
Light-driven oxidation of polysaccharides by photosynthetic pigments and a metalloenzyme journal April 2016
Single-domain flavoenzymes trigger lytic polysaccharide monooxygenases for oxidative degradation of cellulose journal June 2016
Conserved white-rot enzymatic mechanism for wood decay in the Basidiomycota genus Pycnoporus journal April 2020
The Pyrroloquinoline-Quinone-Dependent Pyranose Dehydrogenase from Coprinopsis cinerea Drives Lytic Polysaccharide Monooxygenase Action journal June 2018
Trichoderma reesei Dehydrogenase, a Pyrroloquinoline Quinone-Dependent Member of Auxiliary Activity Family 12 of the Carbohydrate-Active Enzymes Database: Functional and Structural Characterization journal December 2019
Molecular and catalytic properties of fungal extracellular cellobiose dehydrogenase produced in prokaryotic and eukaryotic expression systems journal February 2017
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Biochemical studies of two lytic polysaccharide monooxygenases from the white-rot fungus Heterobasidion irregulare and their roles in lignocellulose degradation journal December 2017
Sequence and Structural Analysis of AA9 and AA10 LPMOs: An Insight into the Basis of Substrate Specificity and Regioselectivity journal September 2019
Influence of Lytic Polysaccharide Monooxygenase Active Site Segments on Activity and Affinity journal December 2019
Direct Electron Transfer of Dehydrogenases for Development of 3rd Generation Biosensors and Enzymatic Fuel Cells journal April 2018
Additional file 2 of Low-abundance populations distinguish microbiome performance in plant cell wall deconstruction dataset January 2022
Additional file 1 of Characterization of a novel AA3_1 xylooligosaccharide dehydrogenase from Thermothelomyces myriococcoides CBS 398.93 dataset January 2023
Additional file 3 of Characterization of a novel AA3_1 xylooligosaccharide dehydrogenase from Thermothelomyces myriococcoides CBS 398.93 dataset January 2023
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How to break down crystalline cellulose journal May 2016
Crystal Structure of the Catalytic and Cytochrome b Domains in a Eukaryotic Pyrroloquinoline Quinone-Dependent Dehydrogenase journal October 2019
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Regioselectivity of oxidation by a polysaccharide monooxygenase from Chaetomium thermophilum journal June 2018
The GMC superfamily of oxidoreductases revisited: analysis and evolution of fungal GMC oxidoreductases journal May 2019
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