X-ray structural, functional and computational studies of the O2-sensitive E. coli hydrogenase-1 C19G variant reveal an unusual [4Fe–4S] cluster

The crystal structure of the Escherichia coli O2-sensitive C19G [NiFe]-hydrogenase-1 variant shows that the mutation results in a novel FeS cluster, proximal to the Ni–Fe active site. While the proximal cluster of the native O2-tolerant enzyme can transfer two electrons to that site, EPR spectroscop...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2018, Vol.54 (52), p.7175-7178
Main Authors: Volbeda, A, Mouesca, J M, Darnault, C, Roessler, M M, Parkin, A, Armstrong, F A, Fontecilla-Camps, J C
Format: Article
Language:English
Subjects:
Clusters
Computation
Crystal structure
E coli
Electron transfer
Hydrogenase
Intermetallic compounds
Iron compounds
Nickel compounds
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Summary:The crystal structure of the Escherichia coli O2-sensitive C19G [NiFe]-hydrogenase-1 variant shows that the mutation results in a novel FeS cluster, proximal to the Ni–Fe active site. While the proximal cluster of the native O2-tolerant enzyme can transfer two electrons to that site, EPR spectroscopy shows that the modified cluster can transfer only one electron, this shortfall coinciding with O2 sensitivity. Computational studies on electron transfer help to explain how the structural and redox properties of the novel FeS cluster modulate the observed phenotype.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc02896f