Linked Life Data

8411149

Source:http://linkedlifedata.com/resource/pubmed/id/8411149

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1993-11-12
pubmed:abstractText
We have constructed versions of the bacteriophage PRM promoter containing short (9 or 12 base pairs) regions of DNA mismatches ("bubble") which include the authentic transcription start site of the unmodified promoter. These constructs direct transcription initiation at positions near the genuine PRM start site. In addition a new start site (designated Pbub) is observed in the region of non-complementarity, from which RNA synthesis proceeds in the opposite direction. The ability to initiate the divergent transcripts is specific to holo enzyme. Mapping of the Pbub start sites shows that they are but a few base pairs upstream of the edge of the bubble. Thus, with respect to the single-stranded region, the location of the start site is no different for Pbub than it is for open complexes at promoters. Compared with an unmodified PRM promoter, the region protected by RNA polymerase from digestion by DNase I is extended in the downstream direction (with respect to the PRM start) at the promoters bearing mismatches; this is consistent with the binding of the divergently transcribing RNA polymerase. Interestingly, cI protein represses rather than activates RNA synthesis originating in the PRM direction, indicating yet another aspect in which the complexes formed at these constructs differ from open complexes at the unmodified promoter.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
233
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
349-58
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
A new start site for Escherichia coli RNA polymerase at an engineered short region of non-complementarity in double-stranded DNA.
pubmed:affiliation
Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.