The [FeFe]-hydrogenase maturation protein HydF contains a H-cluster like [4Fe4S]-2Fe site |
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Authors: | Czech Ilka Stripp Sven Sanganas Oliver Leidel Nils Happe Thomas Haumann Michael |
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Affiliation: | aRuhr-Universität Bochum, Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie, 44780 Bochum, Germany;bFreie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany |
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Abstract: | Formation of the catalytic six-iron complex (H-cluster) of [FeFe]-hydrogenase (HydA) requires its interaction with a specific maturation protein, HydF. Comparison by X-ray absorption spectroscopy at the Fe K-edge of HydF from Clostridium acetobutylicum and HydA1 from Chlamydomonas reinhardtii revealed that the overall structure of the iron site in both proteins is highly similar, comprising a [4Fe4S] cluster (Fe–Fe distances of ∼2.7 Å) and a di-iron unit (Fe–Fe distance of ∼2.5 Å). Thus, a precursor of the whole H-cluster is assembled on HydF. Formation of the core structures of both the 4Fe and 2Fe units may require only the housekeeping [FeS] cluster assembly machinery of the cell. Presumably, only the 2Fe cluster is transferred from HydF to HydA1, thereby forming the active site. |
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Keywords: | Abbreviations: EPR, electron paramagnetic resonance spectroscopy EXAFS, extended X-ray absorption fine structure FTIR, Fourier-transform infrared spectroscopy GTP, guanosine-triphosphate NaDT, sodium dithionite SAM, S-adenosyl-methionine XANES, X-ray absorption near edge structure XAS, X-ray absorption spectroscopy |
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