Linked Life Data

6248243

Source:http://linkedlifedata.com/resource/pubmed/id/6248243

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1980-9-28
pubmed:databankReference
pubmed:abstractText
Incubation of 32P-5' end-labeled DNA fragments of less than 500 bp with excess amounts of the 3' leads to 5', double strand-dependent nuclease Exonuclease III generally results in single-stranded products of slightly more than half the size of the uncleaved substrate. When such restriction fragments of known size and sequence containing the lac operator were incubated with purified lac repressor, Exonuclease III cleavage was blocked at the 3' borders of the operator on each strand. It was possible to define the DNA sequence between the two boundaries of repressor-mediated exonuclease blockade by electrophoresing the single-stranded, protected products in urea-containing polyacrylamide gels in parallel with a dimethylsulfate modification-cleavage digest of the end-labeled, uncleaved substrate. The same approach was applied to an analysis of sites of large SV40 T antigen protection in the vicinity of the origin of SV40 DNA replication. Three discrete boundaries of apparent protection were observed--one on the "late" side of the origin and two on the "early" side. These sequences may constitute the 3' borders of discrete T antigen-binding sites in the origin region. Alternatively, one or more of these blockade points may signify regions of the genome which undergo conformational changes resulting in Exonuclease III resistance due to vicinal T antigen binding.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0092-8674
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
411-22
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1980
pubmed:articleTitle
Mapping of SV40 DNA replication origin region binding sites for the SV40 T antigen by protection against exonuclease III digestion.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.