Abstract
Infrared spectra of 15N-enriched preparations of the soluble cytoplasmic NAD+-reducing [NiFe]-hydrogenase from Ralstonia eutropha are presented. These spectra, together with chemical analyses, show that the Ni-Fe active site contains four cyanide groups and one carbon monoxide molecule. It is proposed that the active site is a (RS)2(CN)Ni(μ-RS)2Fe(CN)3(CO) centre (R=Cys) and that H2 activation solely takes place on nickel. One of the two FMN groups (FMN-a) in the enzyme can be reversibly released upon reduction of the enzyme. It is now reported that at longer times also one of the cyanide groups, the one proposed to be bound to the nickel atom, could be removed from the enzyme. This process was irreversible and induced the inhibition of the enzyme activity by oxygen; the enzyme remained insensitive to carbon monoxide. The Ni-Fe active site was EPR undetectable under all conditions tested. It is concluded that the Ni-bound cyanide group is responsible for the oxygen insensitivity of the enzyme.
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Abbreviations
- BV:
-
benzyl viologen
- DCIP:
-
2,6-dichlorophenol-indophenol
- EXAFS:
-
extended X-ray absorption fine structure
- FTIR:
-
Fourier transform infrared
- MV:
-
methyl viologen
- SH:
-
soluble NAD+-reducing hydrogenase
- XAS:
-
X-ray absorption spectroscopy
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Acknowledgements
This work was supported by the Netherlands Organization for Scientific Research (NWO), the Deutsche Forschungsgemeinschaft, EU-project BIO4-98-0280, and the European Union Cooperation in the field of Scientific and Technical Research (COST), Action-818 and Action-841. We thank Dr K. Schneider (University of Bielefeld, Germany) for the kind gift of enzyme 98% enriched in 15N, Dr R.P. Happe for the IR spectrum of the oxidized enriched enzyme, and W. Roseboom for expert technical assistance.
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Van der Linden, E., Burgdorf, T., Bernhard, M. et al. The soluble [NiFe]-hydrogenase from Ralstonia eutropha contains four cyanides in its active site, one of which is responsible for the insensitivity towards oxygen. J Biol Inorg Chem 9, 616–626 (2004). https://doi.org/10.1007/s00775-004-0555-y
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DOI: https://doi.org/10.1007/s00775-004-0555-y