Linked Life Data

1504099

Source:http://linkedlifedata.com/resource/pubmed/id/1504099

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1992-9-24
pubmed:abstractText
We studied the effect of guanine nucleotides on the carboxyl methylation catalyzed by class II protein carboxylmethyltransferases (PCMT). Addition of guanosine 5'-O-(gamma-thio)triphosphate (GTP gamma S) promoted a time- and concentration-dependent enhancement of protein methylation in the cytosolic fraction isolated from kidney cortex. GTP gamma S affected the kinetics of the methylation reaction, as reflected by alterations of both apparent Km and Vmax of the methyltransferase. This effect was specific for guanine nucleotides and was completely abolished by addition of S-adenosyl-L-homocysteine, a well-known inhibitor of methyltransferase-catalyzed reactions. No GTP gamma S stimulation of methylation was found in cytosolic extracts from any of the other tissues studied, including brain, testis, spleen, and liver, nor in brush-border membranes isolated from the kidney cortex. The methylated proteins were highly sensitive to moderately alkaline conditions, suggesting that the methyl esters were formed on L-isoaspartyl residues and thus methylated by a class II PCMT. These results suggest that class-II-associated protein methylation activity from the soluble fraction of the kidney can be regulated by guanine nucleotides.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
1136
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
150-4
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Guanine nucleotides stimulate carboxyl methylation of kidney cytosolic proteins.
pubmed:affiliation
Département de chimie-biochimie, Université du Québec à Montréal, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't