Linked Life Data

6132615

Source:http://linkedlifedata.com/resource/pubmed/id/6132615

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1983-6-10
pubmed:abstractText
An acetyl-CoA hydrolase that is labile at low temperature was purified to homogeneity from the supernatant fraction of rat liver. The monomeric molecule, estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, had a molecular weight of about 63 000, while that of the purified enzyme, estimated by gel filtration, was 135 000. Thus, the enzyme consists of two subunits of identical molecular weight. On addition of adenosine 5'-triphosphate (ATP) or adenosine 5'-diphosphate (ADP) at 25 degrees C, the dimeric form of the enzyme aggregated to tetrameric forms (Mr 242 000 and Mr 230 000, respectively), whereas addition of adenosine 5'-monophosphate had little effect on enzyme association (Mr 145 000). When ATP was removed from the ATP-treated tetrameric enzyme by dialysis, the tetramer was mostly dissociated into the dimeric form. The apparent Km values for acetyl coenzyme A of the dimeric enzyme and tetrameric enzyme, reconstituted from the former in the presence of 2 mM ATP, were 170 microM and 60 microM, respectively. The purified dimeric enzyme was inactivated by exposure to lower temperature, especially below 10 degrees C. The various nucleotides tested partially stabilize the dimeric enzyme at low temperature, ATP being the most effective. Sucrose density gradient centrifugation showed that loss of catalytic activity by cold treatment was accompanied by dissociation of the dimer and tetramer into protomer.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
22
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
584-90
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Effects of nucleotides on a cold labile acetyl-CoA hydrolase from the supernatant fraction of rat liver.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro