Linked Life Data

15100051

Source:http://linkedlifedata.com/resource/pubmed/id/15100051

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-3
pubmed:dateCreated
2004-4-21
pubmed:abstractText
In this paper, the mechanism of proton pumping in cytochrome c oxidase is examined. Data on cooperative linkage of vectorial proton translocation to oxido-reduction of Cu(A) and heme a in the CO-inhibited, liposome-reconstituted bovine cytochrome c oxidase are reviewed. Results on proton translocation associated to single-turnover oxido-reduction of the four metal centers in the unliganded, membrane-reconstituted oxidase are also presented. On the basis of these results, X-ray crystallographic structures and spectrometric data for a proton pumping model in cytochrome c oxidase is proposed. This model, which is specifically derived from data available for the bovine cytochrome c oxidase, is intended to illustrate the essential features of cooperative coupling of proton translocation at the low potential redox site. Variants will have to be introduced for those members of the heme copper oxidase family which differ in the redox components of the low potential site and in the amino acid network connected to this site. The model we present describes in detail steps of cooperative coupling of proton pumping at the low potential Cu(A)-heme a site in the bovine enzyme. It is then outlined how this cooperative proton transfer can be thermodynamically and kinetically coupled to the chemistry of oxygen reduction to water at the high potential Cu(B)-heme a(3) center, so as to result in proton pumping, in the turning-over enzyme, against a transmembrane electrochemical proton gradient of some 250 mV.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
1655
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
353-64
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
A cooperative model for proton pumping in cytochrome c oxidase.
pubmed:affiliation
Department of Medical Science, Faculty of Medicine, University of Foggia, Foggia, Italy. papabchm@cimedoc.uniba.it
pubmed:publicationType
Journal Article, In Vitro, Review, Research Support, Non-U.S. Gov't