Structural basis for cellobiose dehydrogenase action during oxidative cellulose degradation
- KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology; Karolinska Inst., Stockholm (Sweden). Dept. of Medical Biochemistry; DOE/OSTI
- Univ. of Natural Resources and Life Sciences, Vienna (Austria). Food Biotechnology Lab. Dept. of Food Science and Technology
- KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology; Karolinska Inst., Stockholm (Sweden). Dept. of Medical Biochemistry
- 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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