2010
DOI: 10.1002/cphc.200901002
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H2 Conversion in the Presence of O2 as Performed by the Membrane‐Bound [NiFe]‐Hydrogenase of Ralstonia eutropha

Abstract: [NiFe]-hydrogenases catalyze the oxidation of H(2) to protons and electrons. This reversible reaction is based on a complex interplay of metal cofactors including the Ni-Fe active site and several [Fe-S] clusters. H(2) catalysis of most [NiFe]-hydrogenases is sensitive to dioxygen. However, some bacteria contain hydrogenases that activate H(2) even in the presence of O(2). There is now compelling evidence that O(2) affects hydrogenase on three levels: 1) H(2) catalysis, 2) hydrogenase maturation, and 3) H(2)-m… Show more

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Cited by 103 publications
(102 citation statements)
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“…S11). Because stability of five or six coordinated clusters relates to the presence of terminal thiol ligands (24,26), there may also be an active role for the second additional cysteine, as demonstrated in recent mutation experiments (13). The presence of the second additional cysteine is thus likely to be important for the stability of the induced HiPIP-like core.…”
Section: Discussionmentioning
confidence: 92%
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“…S11). Because stability of five or six coordinated clusters relates to the presence of terminal thiol ligands (24,26), there may also be an active role for the second additional cysteine, as demonstrated in recent mutation experiments (13). The presence of the second additional cysteine is thus likely to be important for the stability of the induced HiPIP-like core.…”
Section: Discussionmentioning
confidence: 92%
“…1), which show similar spectroscopic features (11,12). The presence of these residues has been shown to contribute to the oxygen stability of the R. eutropha enzyme and is therefore associated with a possible redox chemistry protecting the enzyme against oxidative stress (13). In the present work the type and redox properties of the constituent iron-sulfur clusters are investigated with the aim to (i) portray the energy coupled processes between Hase I and its redox partners and (ii) outline a relation between O 2 -tolerance and electronic/ chemical events occurring at the iron-sulfur clusters.…”
mentioning
confidence: 87%
“…A further common feature of [NiFe] H 2 ases is the ligation of the Fe by two cyanides (CN -) and one CO as observed by FTIR spectroscopy (36,(42)(43). Apart from these similarities, biochemical, electrochemical, and spectroscopic results (26,36,(43)(44)(45) suggest that O 2 tolerance of the MBH is related to the structural arrangement of its metal cofactors, rather than to the restricted access of O 2 and CO to the [NiFe] site due to a narrow gas-channel as proposed for H 2 -sensing H 2 ases (12,26,46). Notably, compared to standard H 2 ases, biosynthesis of active MBH requires a significantly larger set of maturation proteins (47)(48)(49).…”
mentioning
confidence: 88%
“…Spectroscopic studies on the MBH using EPR and FTIR techniques uncovered several features differing from those of standard enzymes (43)(44)(45)(46). The so-called Ni-A state, corresponding to oxidized, inactive unready enzyme, was not detectable in wild-type MBH.…”
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confidence: 90%
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