Linked Life Data

6194900

Source:http://linkedlifedata.com/resource/pubmed/id/6194900

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1983-12-21
pubmed:databankReference
pubmed:abstractText
The rate of in vivo transcription from the E. coli tRNA and rRNA promoters depends on both cellular growth rate and aminoacid availability. To investigate the molecular mechanisms involved we determined the extent of interaction of RNA polymerase with the promoter of the tyrT stable RNA gene. We show that the enzyme can protect from DNAase I digestion a region of at least 85 bp of the wild-type tyrT promoter and only approximately 62 bp of the lacUV5 mRNA promoter, the protected region extending on the antisense strand to approximately 65 and 42 bp respectively upstream of the transcription startpoint. A mutant tyrT promoter, tyrTp27, is protected more extensively, RNA polymerase interactions extending to at least approximately -130. We propose that these upstream interactions of RNA polymerase perform two functions; activating initiation by polymerase bound at the primary binding site and increasing the concentration of polymerase in the vicinity of the tyrT promoter, thus allowing a high rate of maximal expression and enabling the promoter to be regulated over a wide range of activity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0092-8674
pubmed:author
pubmed:issnType
Print
pubmed:volume
35
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
265-73
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
RNA polymerase interactions with the upstream region of the E. coli tyrT promoter.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't