1n60: Difference between revisions
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'''Crystal Structure of the Cu,Mo-CO Dehydrogenase (CODH); Cyanide-inactivated Form''' | '''Crystal Structure of the Cu,Mo-CO Dehydrogenase (CODH); Cyanide-inactivated Form''' | ||
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==Reference== | ==Reference== | ||
Catalysis at a dinuclear [CuSMo(==O)OH] cluster in a CO dehydrogenase resolved at 1.1-A resolution., Dobbek H, Gremer L, Kiefersauer R, Huber R, Meyer O, Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):15971-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12475995 12475995] | Catalysis at a dinuclear [CuSMo(==O)OH] cluster in a CO dehydrogenase resolved at 1.1-A resolution., Dobbek H, Gremer L, Kiefersauer R, Huber R, Meyer O, Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):15971-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12475995 12475995] | ||
[[Category: Oligotropha carboxidovorans]] | [[Category: Oligotropha carboxidovorans]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: Kiefersauer, R.]] | [[Category: Kiefersauer, R.]] | ||
[[Category: Meyer, O.]] | [[Category: Meyer, O.]] | ||
[[Category: | [[Category: Codh]] | ||
[[Category: | [[Category: Copper]] | ||
[[Category: | [[Category: Molybdenum]] | ||
[[Category: | [[Category: Molybdopterin]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:08:13 2008'' | |||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | |||
Revision as of 02:08, 3 May 2008
Crystal Structure of the Cu,Mo-CO Dehydrogenase (CODH); Cyanide-inactivated Form
OverviewOverview
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.
About this StructureAbout this Structure
1N60 is a Protein complex structure of sequences from Oligotropha carboxidovorans. Full crystallographic information is available from OCA.
ReferenceReference
Catalysis at a dinuclear [CuSMo(==O)OH] cluster in a CO dehydrogenase resolved at 1.1-A resolution., Dobbek H, Gremer L, Kiefersauer R, Huber R, Meyer O, Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):15971-6. PMID:12475995 Page seeded by OCA on Sat May 3 02:08:13 2008