1N61

Crystal Structure of the Cu,Mo-CO Dehydrogenase (CODH); Dithionite reduced state

Summary for 1N61

• Entry DOI: 10.2210/pdb1n61/pdb
• Related: 1N5W 1N60 1N62 1N63
• Descriptor: Carbon monoxide dehydrogenase small chain, Carbon monoxide dehydrogenase large chain, Carbon monoxide dehydrogenase medium chain, ... (9 entities in total)
• Functional Keywords: codh, molybdenum, molybdopterin, oxidoreductase
• Biological source: Oligotropha carboxidovorans; More
• Total number of polymer chains: 6
• Total formula weight: 278080.64

Authors

Dobbek, H.,Gremer, L.,Kiefersauer, R.,Huber, R.,Meyer, O. (deposition date: 2002-11-08, release date: 2002-12-18, Last modification date: 2024-03-13)

Primary citation

Dobbek, H.,Gremer, L.,Kiefersauer, R.,Huber, R.,Meyer, O.
Catalysis at a dinuclear [CuSMo(=O)OH] cluster in a CO dehydrogenase resolved at 1.1-A resolution
Proc.Natl.Acad.Sci.USA, 99:15971-15976, 2002

PubMed Abstract: The CO dehydrogenase of the eubacterium Oligotropha carboxidovorans is a 277-kDa Mo- and Cu-containing iron-sulfur flavoprotein. Here, the enzyme's active site in the oxidized or reduced state, after inactivation with potassium cyanide or with n-butylisocyanide bound to the active site, has been reinvestigated by multiple wavelength anomalous dispersion measurements at atomic resolution, electron spin resonance spectroscopy, and chemical analyses. We present evidence for a dinuclear heterometal [CuSMoO)OH] cluster in the active site of the oxidized or reduced enzyme, which is prone to cyanolysis. The cluster is coordinated through interactions of the Mo with the dithiolate pyran ring of molybdopterin cytosine dinucleotide and of the Cu with the Sgamma of Cys-388, which is part of the active-site loop VAYRC(388)SFR. The previously reported active-site structure [Dobbek, H., Gremer, L., Meyer, O. & Huber, R. (1999) Proc. Natl. Acad. Sci. USA 96, 8884-8889] of an Mo with three oxygen ligands and an SeH-group bound to the Sgamma atom of Cys-388 could not be confirmed. The structure of CO dehydrogenase with the inhibitor n-butylisocyanide bound has led to a model for the catalytic mechanism of CO oxidation which involves a thiocarbonate-like intermediate state. The dinuclear [CuSMo(O)OH] cluster of CO dehydrogenase establishes a previously uncharacterized class of dinuclear molybdoenzymes containing the pterin cofactor.

PubMed: 12475995
DOI: 10.1073/pnas.212640899

Experimental method

X-RAY DIFFRACTION (1.3 Å)