Linked Life Data

1651394

Source:http://linkedlifedata.com/resource/pubmed/id/1651394

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1991-9-13
pubmed:abstractText
A region upstream from the Escherichia coli rrnB P1 promoter, the upstream activator region (UAR), increases the activity of the promoter in vivo and the rate of association with RNA polymerase (E sigma 70) in vitro in the presence of the two initiating nucleotides. We have used four types of chemical and enzymatic footprinting probes to determine whether rrnB P1-E sigma 70 complexes formed in the presence of the initiating nucleotides (RPinit) differ from typical open complexes (RPo) formed in the absence of the initiating nucleotides and to examine the structural differences between rrnB P1 complexes containing the UAR and those lacking the UAR. We find that the rrnB P1-RPinit complex closely resembles open complexes formed at other E sigma 70 promoters, indicating that the formation of the first phosphodiester bond does not result in a major rearrangement of the promoter-RNA polymerase complex. An unusual potassium permanganate modification at position -18 in both RPo and RPinit indicates the possible presence of a subtle difference in the -10, -35 spacer structure compared to some other E. coli promoters. We show that the E sigma 70-rrnB P1 complex formed with the promoter containing the UAR has DNase I and hydroxyl radical cleavage patterns in the -50 region different from those observed with the same promoter lacking the UAR. These results are interpreted to indicate that E sigma 70 may interact with a region further upstream from that contacted by RNA polymerase bound at most other promoters and/or that unusual structural properties of this region are induced by bound E sigma 70.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
220
pubmed:geneSymbol
rrnB P1
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
569-83
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Factor-independent activation of Escherichia coli rRNA transcription. II. characterization of complexes of rrnB P1 promoters containing or lacking the upstream activator region with Escherichia coli RNA polymerase.
pubmed:affiliation
Department of Bacteriology, University of Wisconsin-Madison 53706.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't