Linked Life Data

6744514

Source:http://linkedlifedata.com/resource/pubmed/id/6744514

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
1984-9-6
pubmed:abstractText
A rapid assay of O6-MeG-DNA methyltransferase activity is described. Following incubation of cell extracts with O6-[3H]MeG-containing DNA, remaining radioactive DNA was hydrolyzed in trichloroacetic acid and separated from methylated radioactive protein by filtration or centrifugation. Transfer of radioactive methyl from DNA to protein was proportional to the amount of protein added, and was not linear with time. More than 90% of the radioactivity precipitated after acid hydrolyses was in S-methyl cysteine residues. The method was used to measure O6-MeG-DNA methyltransferase activity in extracts of 24 neoplastic tissues from human organs. Although five tumor tissues had 28-84% lower activity of O6-MeG-DNA methyltransferase than the corresponding normal tissue from the same patient, higher or similar levels of activity were found more frequently. Thus, a lack of O6-MeG-DNA methyltransferase activity in human tumours appears not to be a frequent event. The DNA repair enzyme uracil-DNA glycosylase was also measured in the same extracts. Most frequently the level of uracil-DNA glycosylase activity was essentially similar in tumors and normal tissues but significantly higher or lower levels were also observed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0143-3334
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1061-4
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
A simplified assay for O6-methylguanine-DNA methyltransferase activity and its application to human neoplastic and non-neoplastic tissues.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't