A novel binuclear [CuSMo] cluster at the active site of carbon monoxide dehydrogenase: Characterization by X-ray absorption spectroscopy

被引:74
作者
Gnida, M
Ferner, R
Gremer, L
Meyer, O
Meyer-Klaucke, W
机构
[1] DESY, Outstn Hamburg, European Mol Biol Lab, D-22603 Hamburg, Germany
[2] Univ Bayreuth, Dept Microbiol, D-95440 Bayreuth, Germany
[3] Univ Bayreuth, Bayreuth Ctr Mol Biosci BZMB, D-95440 Bayreuth, Germany
关键词
D O I
10.1021/bi026514n
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The structurally characterized molybdoenzyme carbon monoxide dehydrogenase (CODH) catalyzes the oxidation Of CO to CO2 in the aerobic bacterium Oligotropha carboxidovorans. The active site of the enzyme was studied by Mo- and Cu-K-edge X-ray absorption spectroscopy. This revealed a bimetallic [(CuSMOVI)-S-I(=O)(2)] cluster in oxidized CODH which was converted into a [(CuSMoIV)-S-I(=O)- OH(2)] cluster upon reduction. The Cu...Mo distance is 3.70 Angstrom in the oxidized form and is increased to 4.23 Angstrom upon reduction. The bacteria contain CODH species with the complete and functional bimetallic cluster along with enzyme species deficient in Cu and/or bridging S. The latter are precursors in the posttranslational biosynthesis of the metal cluster. Cu-deficient CODH is the most prominent precursor and contains a [HSMo(=O)OH(2)] cluster. Se-K-edge X-ray absorption spectroscopy demonstrates that Se is coordinated by two C atoms at 1.94-1.95 Angstrom distance. This is interpreted as a replacement of the S in methionine residues. In contrast to a previous report [Dobbek, H., Gremer, L., Meyer, O., and Huber, R. (1999) Proc. Nad. Acad. Sci. U.S.A. 96, 8884-8889] Se was not identified in the active site of CODH.
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页码:222 / 230
页数:9
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