Linked Life Data

1383090

Source:http://linkedlifedata.com/resource/pubmed/id/1383090

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1992-11-23
pubmed:abstractText
Coliphage N4 is a double-stranded DNA virus that requires the sequential activity of three different RNA polymerases during infection. The N4 virion RNA polymerase, which is carried in the virion and is injected with the DNA at the start of infection, is responsible for the synthesis of N4 early RNAs. In vitro, the virion RNA polymerase can transcribe double-stranded N4 DNA accurately and efficiently but only when the DNA is denatured. We have shown previously that the activity of DNA gyrase is required for in vivo early N4 transcription. We report here that Escherichia coli single-stranded DNA-binding protein (SSB) is also required for N4 early transcription. In vitro, linear or relaxed templates cannot be activated by SSB; however, supercoiled template and SSB allow the virion polymerase to recognize its promoters on duplex DNA and activate transcription. The effects of supercoiling are limited to transcript initiation and are not required for transcript elongation. The activation is specific for SSB; no other single-stranded DNA-binding proteins can substitute. Therefore, SSB is one of a small number of proteins that function to stimulate both replication and transcription. The basis for the specificity of SSB, the mechanism of transcriptional activation by SSB and template supercoiling, and their role in the N4 transcriptional program during development are discussed.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0890-9369
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2010-9
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Escherichia coli single-stranded DNA-binding protein is a supercoiled template-dependent transcriptional activator of N4 virion RNA polymerase.
pubmed:affiliation
Department of Molecular Genetics and Cell Biology, University of Chicago, Illinois 60637.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.