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1cyx

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{{STRUCTURE_1cyx| PDB=1cyx | SCENE= }}
{{STRUCTURE_1cyx| PDB=1cyx | SCENE= }}
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'''QUINOL OXIDASE (PERIPLASMIC FRAGMENT OF SUBUNIT II WITH ENGINEERED CU-A BINDING SITE)(CYOA)'''
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===QUINOL OXIDASE (PERIPLASMIC FRAGMENT OF SUBUNIT II WITH ENGINEERED CU-A BINDING SITE)(CYOA)===
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==Overview==
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Cytochrome oxidase is a membrane protein complex that catalyzes reduction of molecular oxygen to water and utilizes the free energy of this reaction to generate a transmembrane proton gradient during respiration. The electron entry site in subunit II is a mixed-valence dinuclear copper center in enzymes that oxidize cytochrome c. This center has been lost during the evolution of the quinoloxidizing branch of cytochrome oxidases but can be restored by engineering. Herein we describe the crystal structures of the periplasmic fragment from the wild-type subunit II (CyoA) of Escherichia coli quinol oxidase at 2.5-A resolution and of the mutant with the engineered dinuclear copper center (purple CyoA) at 2.3-A resolution. CyoA is folded as an 11-stranded mostly antiparallel beta-sandwich followed by three alpha-helices. The dinuclear copper center is located at the loops between strands beta 5-beta 6 and beta 9-beta 10. The two coppers are at a 2.5-A distance and symmetrically coordinated to the main ligands that are two bridging cysteines and two terminal histidines. The residues that are distinct in cytochrome c and quinol oxidases are around the dinuclear copper center. Structural comparison suggests a common ancestry for subunit II of cytochrome oxidase and blue copper-binding proteins.
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(as it appears on PubMed at http://www.pubmed.gov), where 8618822 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8618822}}
==About this Structure==
==About this Structure==
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[[Category: Wilmanns, M.]]
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[[Category: Electron transport]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 21:49:11 2008''

Revision as of 18:49, 30 June 2008

Image:1cyx.png

Template:STRUCTURE 1cyx

QUINOL OXIDASE (PERIPLASMIC FRAGMENT OF SUBUNIT II WITH ENGINEERED CU-A BINDING SITE)(CYOA)

Template:ABSTRACT PUBMED 8618822

About this Structure

1CYX is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structure of the membrane-exposed domain from a respiratory quinol oxidase complex with an engineered dinuclear copper center., Wilmanns M, Lappalainen P, Kelly M, Sauer-Eriksson E, Saraste M, Proc Natl Acad Sci U S A. 1995 Dec 19;92(26):11955-9. PMID:8618822

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