Linked Life Data

2432066

Source:http://linkedlifedata.com/resource/pubmed/id/2432066

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1987-2-18
pubmed:abstractText
Since we had shown recently that fatty acyl-CoA derivatives stimulate (Na+ + K+)-ATPase activity at suboptimal ATP concentrations, we used sealed vesicles of beef heart sarcolemma to examine the effects of these compounds on the transport function of the enzyme. The sodium pump was detected in inside-out vesicles as a component of Na+ uptake that was dependent on intravesicular (extracellular) K+ and extravesicular (intracellular) ATP and was sensitive to vanadate and digitoxigenin. The pump flux was stimulated without a lag by palmitoyl-CoA (K0.5 = 3 microM) when ATP concentration was 50 microM, but not when it was 2 mM. Saturating palmitoyl-CoA reduced the K0.5 of ATP for the pump by a factor of 3-6. Raising the intracellular K+ concentration increased the K0.5 of ATP, and this effect of K+ was antagonized by palmitoyl-CoA. At concentrations up to 0.5 mM, palmitoyl-CoA had no effect on ATP-independent (passive) Na+ uptake. All tested long-chain acyl-CoA derivatives had effects similar to that of palmitoyl-CoA; but CoA, acetyl-CoA, and palmitic acid were ineffective. Palmitoyl carnitine and docosahexanoic acid, amphiphilic compounds with inhibitory and biphasic effects on the hydrolytic activity of purified (Na+ + K+)-ATPase, had purely inhibitory effects on the pump at high concentrations that also affected the passive fluxes. The data support the proposition that fatty acyl-CoA derivatives mimic the effect of ATP at a regulatory site and suggest that these intracellular liponucleotides may be involved in the control of the pump.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
262
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
42-5
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Control of cardiac sodium pump by long-chain acyl coenzymes A.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.