Linked Life Data

2661828

Source:http://linkedlifedata.com/resource/pubmed/id/2661828

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1989-8-8
pubmed:abstractText
We have systematically assayed the in vivo promoter recognition properties of 13 mutations in rpoD, the gene that encodes the sigma 70 subunit of Escherichia coli RNA polymerase holoenzyme, using transcriptional fusions to 37 mutant and wild-type promoters. We found three classes of rpoD mutations: (1) mutations that suggest contacts between amino acid side-chains of sigma 70 and specific bases in the promoter; (2) mutations that appear to affect either sequence independent contacts to promoter DNA or isomerization of the polymerase; and (3) mutations that have little or no effect on promoter recognition. Our results lead us to suggest that a sequence near the C terminus of sigma 70, which is similar to the helix-turn-helix DNA binding motif of phage and bacterial DNA binding proteins, is responsible for recognition of the -35 region, and that a sequence internal to sigma 70, in a region which is highly conserved among sigma factors, recognizes the -10 region of the promoter. rpoD mutations that lie in the recognition helix of the proposed helix-turn-helix motif affect interactions with specific bases in the -35 region, while mutations in the upstream helix, which is thought to contact the phosphate backbone, have sequence-independent effect on promoter recognition.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
206
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
591-603
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Altered promoter recognition by mutant forms of the sigma 70 subunit of Escherichia coli RNA polymerase.
pubmed:affiliation
Department of Bacteriology, University of Wisconsin, Madison 53706.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.