Linked Life Data

6830231

Source:http://linkedlifedata.com/resource/pubmed/id/6830231

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1983-4-15
pubmed:abstractText
Methoxycarbonyl-CoA disulfide has been used as an active-site-directed inhibitor of carnitine acetyltransferase. Stoichiometric addition of methoxycarbonyl-CoA disulfide to carnitine acetyltransferase showed the modification of one sulfhydryl group with concomitant loss of about 80% enzyme activity. The rate of modification of this sulfhydryl group is an order of magnitude faster than that of the remaining sulfhydryl groups in the enzyme. Methoxycarbonyl-CoA disulfide inactivation is biphasic: k1 = 1.09 X 10(2) M-1 S-1, k2 = 1.1 X 10(1) M-1 S-1. This modification, Enz-SS-CoA is covalent; it can be reversed with either dithioerythritol or thiocholine. Acetyl-carnitine and acetyl-CoA protected the enzyme against methoxycarbonyl-CoA disulfide inactivation; however, carnitine did not. These results indicate the presence of a sulfhydryl group in carnitine acetyltransferase at the site of acetyl group transfer. Titration of carnitine acetyltransferase with nonspecific sulfhydryl reagents, DTNB, and rho-nitrophenoxycarbonyl methyl disulfide, revealed that four sulfhydryl groups were preferentially modified by these reagents. The results also show that seven other sulfhydryl groups are available for modification.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0003-9861
pubmed:author
pubmed:issnType
Print
pubmed:volume
220
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
193-9
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Active-site-directed inhibition of carnitine acetyltransferase.
pubmed:publicationType
Journal Article