How the oxygen tolerance of a [NiFe]-hydrogenase depends on quaternary structure

Philip Wulff, Claudia Thomas, Frank Sargent, Fraser A. Armstrong (Lead / Corresponding author)

Research output: Contribution to journalArticle

18 Citations (Scopus)
144 Downloads (Pure)

Abstract

‘Oxygen-tolerant’ [NiFe]-hydrogenases can catalyze H2 oxidation under aerobic conditions, avoiding oxygenation and destruction of the active site. In one mechanism accounting for this special property, membrane-bound [NiFe]-hydrogenases accommodate a pool of electrons that allows an O2 molecule attacking the active site to be converted rapidly to harmless water. An important advantage may stem from having a dimeric or higher-order quaternary structure in which the electron-transfer relay chain of one partner is electronically coupled to that in the other. Hydrogenase-1 from E. coli has a dimeric structure in which the distal [4Fe-4S] clusters in each monomer are located approximately 12 Å apart, a distance conducive to fast electron tunneling. Such an arrangement can ensure that electrons from H2 oxidation released at the active site of one partner are immediately transferred to its counterpart when an O2 molecule attacks. This paper addresses the role of long-range, inter-domain electron transfer in the mechanism of O2-tolerance by comparing the properties of monomeric and dimeric forms of Hydrogenase-1. The results reveal a further interesting advantage that quaternary structure affords to proteins.

Original languageEnglish
Pages (from-to)121-134
Number of pages14
JournalJournal of Biological Inorganic Chemistry
Volume21
Issue number1
Early online date9 Feb 2016
DOIs
Publication statusPublished - Mar 2016

Keywords

  • Electron transfer
  • Hydrogen
  • Hydrogenase
  • Iron-sulfur clusters
  • Quaternary structure

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