Linked Life Data

8645697

Source:http://linkedlifedata.com/resource/pubmed/id/8645697

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1996-7-19
pubmed:abstractText
The combination of EPR and low-temperature near-IR magnetic circular dichroism spectroscopies have been used to investigate the axial ligation of the cytochromes in the cytochrome bc1 complexes from bovine heart mitochondria, Rhodobacter capsulatus, Rhodobacter sphaeroides, and Rhodospirillum rubrum, and the purified cytochromes c1 from bovine heart mitochondria, Rb. capsulatus and Rb. sphaeroides. The possibility of axial ligation of cytochrome c1 by the amino terminus of the polypeptide was also assessed by acetylating the N-terminus of Rb. capsulatus cytochrome c1 and comparing the properties of the acetylated and unmodified samples. The results are consistent with bis-histidine axial ligation for the high- and low-potential b-type cytochromes and histidine/methionine axial ligation for the c1-type cytochrome in the intact cytochrome bc1 complexes. Purified samples of cytochrome c1 are mixtures of two forms, one with histidine/methionine and the other with bis-histidine axial ligation. The form with bis-histidine axial ligation is also assembled in the M183L mutant of the Rb. capsulatus cyt bc1 complex in which the methionine residue coordinating cyt c1 is replaced by a leucine. The bis-histidine form appears to be an artifact of dissociation of cytochrome c1 from the cytochrome bc1 complex and is greatly enhanced particularly in the bacterial cytochromes c1 by sample handling and the addition of 50% (v/v) ethylene glycol or glycerol.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
1274
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
9-20
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Axial heme ligation in the cytochrome bc1 complexes of mitochondrial and photosynthetic membranes. A near-infrared magnetic circular dichroism and electron paramagnetic resonance study.
pubmed:affiliation
Department of Chemistry and Center for Metalloenzyme Studies, University of Georgia, Athens 30602, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.