Linked Life Data

1311390

Source:http://linkedlifedata.com/resource/pubmed/id/1311390

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1992-3-31
pubmed:abstractText
Cloning and sequencing of cDNA segments of human TOP2 gene encoding the 170 kDa form of human DNA topoisomerase II show that Arg486 of the enzyme has been mutated to a lysine in the enzyme from two human leukemia cell lines HL-60/AMSA and KBM-3/AMSA, which were independently selected for resistance to the antitumor drug amsacrine (4'-[9-acridinylamino]-methanesulfon-m-anisidide, mAMSA). Sequence identity comparisons between eukaryotic DNA topoisomerase II and bacterial gyrase (bacterial DNA topoisomerase II) indicate that the position of the common mutation observed in mAMSA-resistant human TOP2 corresponds to that of the point mutation nal-31 in the Escherichia coli gyrase B gene, which confers resistance to nalidixic acid. Because mAMSA and nalidixic acid are known to act on their respective targets by a common mechanism of trapping the covalent enzyme-DNA intermediates, these results provide strong evidence that the 170 kDa form of human DNA topoisomerase II is a major cellular target of mAMSA, and that Arg486 of this enzyme is involved in mAMSA-mediated trapping of the covalent enzyme-DNA complex.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
223
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
837-43
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Two independent amsacrine-resistant human myeloid leukemia cell lines share an identical point mutation in the 170 kDa form of human topoisomerase II.
pubmed:affiliation
Division of Laboratory Medicine, University of Texas M. D. Anderson Cancer Center, Houston 77030.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't