Linked Life Data

178362

Source:http://linkedlifedata.com/resource/pubmed/id/178362

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1976-8-2
pubmed:abstractText
Spin-labeled phosphatidylcholine was incorporated into the membrane of isolated "inner membrane+matrix" particles of rat liver mitochondria by incubation with sonicated spin-labeled phosphatidylcholine vesicles at 22 degrees C. When the spin label was on the acyl chain the incorporation of phosphatidylcholine into the membrane was stimulated by the presence of the phosphatidylcholine exchange protein extracted from rat or beef liver. On the other hand no stimulation was observed when the nitroxide was on the polar head-group. When spin-labeled phosphatidycholine was incorporated into the mitochondrial membrane in the absence of phosphatidylcholine exchange protein, ascorbate treatment at 0 degrees C reduced the EPR signal of the spin-labeled membranes by approximately 50%, indicating that fusion incorporates molecules equally on both sides of the membrane. On the other hand when spin-labeled phosphatidylcholine was incorporated in the presence of the exchange protein most of the EPR signal could be destroyed by the ascorbate treatment at 0 degrees C, indicating that the spin-labeled phosphatidylcholine had been selectively incorporated in the outer layer of the membrane. Finally when the label is on the polar head-group the inner content of mitochondria reduces the label facing the matrix, thus creating again an anisotropy of the labeling. The anisotropic distribution of spin-labeled phosphatidylcholine in the mitochondrial membrane was found to be stable at 25 degrees C for more than 2 h. It is therefore concluded that the rate of outside-inside and inside-outside transitions are extremely slow (half-life greater than 24 h).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
19
pubmed:volume
426
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
372-84
pubmed:dateRevised
2003-11-14
pubmed:meshHeading
pubmed:year
1976
pubmed:articleTitle
Study of the transverse diffusion of spin-labeled phospholipids in biological membranes. II. Inner mitochondrial membrane of rat liver: use of phosphatidylcholine exchange protein.
pubmed:publicationType
Journal Article