2c3c

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[[Image:2c3c.gif|left|200px]]
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{{STRUCTURE_2c3c| PDB=2c3c | SCENE= }}
{{STRUCTURE_2c3c| PDB=2c3c | SCENE= }}
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'''2.01 ANGSTROM X-RAY CRYSTAL STRUCTURE OF A MIXED DISULFIDE BETWEEN COENZYME M AND NADPH-DEPENDENT OXIDOREDUCTASE 2-KETOPROPYL COENZYME M CARBOXYLASE'''
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===2.01 ANGSTROM X-RAY CRYSTAL STRUCTURE OF A MIXED DISULFIDE BETWEEN COENZYME M AND NADPH-DEPENDENT OXIDOREDUCTASE 2-KETOPROPYL COENZYME M CARBOXYLASE===
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==Overview==
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The structure of the mixed, enzyme-cofactor disulfide intermediate of ketopropyl-coenzyme M oxidoreductase/carboxylase has been determined by X-ray diffraction methods. Ketopropyl-coenzyme M oxidoreductase/carboxylase belongs to a family of pyridine nucleotide-containing flavin-dependent disulfide oxidoreductases, which couple the transfer of hydride derived from the NADPH to the reduction of protein cysteine disulfide. Ketopropyl-coenzyme M oxidoreductase/carboxylase, a unique member of this enzyme class, catalyzes thioether bond cleavage of the substrate, 2-ketopropyl-coenzyme M, and carboxylation of what is thought to be an enzyme-stabilized enolacetone intermediate. The mixed disulfide of 2-ketopropyl-coenzyme M oxidoreductase/carboxylase was captured through crystallization of the enzyme with the physiological products of the reaction, acetoacetate, coenzyme M, and NADP, and reduction of the crystals with dithiothreitol just prior to data collection. Density in the active-site environment consistent with acetone, the product of reductive decarboxylation of acetoacetate, was revealed in this structure in addition to a well-defined hydrophobic pocket or channel that could be involved in the access for carbon dioxide. The analysis of this structure and that of a coenzyme-M-bound form provides insights into the stabilization of intermediates, substrate carboxylation, and product release.
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(as it appears on PubMed at http://www.pubmed.gov), where 16388586 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16388586}}
==About this Structure==
==About this Structure==
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[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
[[Category: Redox-active center]]
[[Category: Redox-active center]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 21:11:08 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:53:35 2008''

Revision as of 04:53, 28 July 2008

Image:2c3c.png

Template:STRUCTURE 2c3c

2.01 ANGSTROM X-RAY CRYSTAL STRUCTURE OF A MIXED DISULFIDE BETWEEN COENZYME M AND NADPH-DEPENDENT OXIDOREDUCTASE 2-KETOPROPYL COENZYME M CARBOXYLASE

Template:ABSTRACT PUBMED 16388586

About this Structure

2C3C is a Single protein structure of sequence from Xanthobacter autotrophicus. Full crystallographic information is available from OCA.

Reference

Mechanistic implications of the structure of the mixed-disulfide intermediate of the disulfide oxidoreductase, 2-ketopropyl-coenzyme M oxidoreductase/carboxylase., Pandey AS, Nocek B, Clark DD, Ensign SA, Peters JW, Biochemistry. 2006 Jan 10;45(1):113-20. PMID:16388586

Page seeded by OCA on Mon Jul 28 07:53:35 2008

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