Linked Life Data

2001354

Source:http://linkedlifedata.com/resource/pubmed/id/2001354

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1991-4-17
pubmed:abstractText
The location of OsO4 bispyridine hyper- and hyporeactivity in a small deletion derivative of plasmid ColE1 (PTC12, 1727 bp) has been determined for approximately 70% of the molecule. Thymine bases in homopolymeric (dA)n.(dT)n tracts (n greater than or equal to 4) were always found to be resistant toward OsO4 modification. DNA supercoiling did not destabilize these tracts. The extent of OsO4 bispyridine reactivity of homopolymeric (dA)n.(dT)n tracts, where n = 3, was found to be dependent on the rate of base unpairing of the sequence immediately 5' and 3' to the tract. Repressed OsO4 reactivity of thymine bases in (dA)3.(dT)3 tracts was observed if immediately both 5' and 3' to the tract were stable DNA sequences composed of GC base pairs and/or a homopolymeric (dA)n.(dT)n tract (n greater than or equal to 4). Homopolymeric tracts of n = 3 not having adjacent sequences with repressed unpairing rates did not show reduced levels of OsO4 bispyridine reactivity. Alternating d(TA)n tracts (n greater than or equal to 2) were found to exhibit hyperreactivity with OsO4. The extent of this hyperreactivity was dependent on the length of the tract and superhelical torsional stress. The distribution and frequency of homopolymeric (dA)n.(dT)n (n greater than or equal to 4) tracts in Escherichia coli promoter sequences were examined, and the possible implications of these tracts on promoter function are discussed.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2664-73
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Differential sequence dynamics of homopolymeric and alternating AT tracts in a small plasmid DNA.
pubmed:affiliation
Department of Microbiology, University of Alabama, Birmingham 35294.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.