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Theoretical investigation of aerobic and anaerobic oxidative inactivation of [NiFe]-hydrogenases active site

Abstract

The extraordinary capability of [NiFe]-hydrogenases to catalyse the reversible interconversion of protons and electrons into dihydrogen (H2) has stimulated numerous experimental and theoretical studies addressed to the direct utilization of these enzymes in H2 production processes. Unfortunately, the introduction of these natural H2-catalysts into biotechnological applications is limited by their inhibition under oxidising (aerobic and anaerobic) conditions. With the aim of contributing to overcome this limitation, we studied the oxidative inactivation mechanism of [NiFe]-hydrogenases by performing Density Functional Theory (DFT) calculations on a very large model of their active site in which all the amino acids forming the first and second coordination sphere of the NiFe cluster have been explicitly included. We identified O2 molecule and two H2O molecules as sources of the two oxygen atoms that are inserted in the active site of the inactive forms of the enzyme (Ni-A and Ni-B) under aerobic and anaerobic conditions, respectively. Furthermore, our results support the experimental evidence that the NiA-to-NiB ratio strongly depends on the number of reducing equivalents available for the process and on the oxidizing conditions under which the reaction takes place.

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Publication details

The article was received on 12 Sep 2017, accepted on 28 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06228A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Theoretical investigation of aerobic and anaerobic oxidative inactivation of [NiFe]-hydrogenases active site

    R. Breglia, C. Greco, P. Fantucci, L. De Gioia and M. Bruschi, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06228A

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