Linked Life Data

2841344

Source:http://linkedlifedata.com/resource/pubmed/id/2841344

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
24
pubmed:dateCreated
1988-9-20
pubmed:databankReference
pubmed:abstractText
The dnaN gene of Escherichia coli determines the beta subunit of DNA polymerase III, a multisubunit enzyme responsible for most of the replicative DNA synthesis. The dnaN gene maps between the dnaA and recF genes. We have characterized the regulatory region of the dnaN gene by screening DNA restriction fragments for promoter activity, S1 mapping of mRNAs, deletion analysis, and in vivo dnaN complementation tests. There are at least three dnaN promoters located in the second half of the dnaA coding region. The one closest to the dnaN structural gene is the weakest, but it provides sufficient dnaN expression for complementation when the gene is present on a multicopy plasmid. Deletion of sequences needed for initiation of dnaN translation or introduction of nonsense codons into dnaN causes reduction of recF expression. However, a deletion inactivating dnaN without changing the reading frame of the gene does not affect expression of the recF gene. These results indicate that the dnaN and recF genes are organized in an operon. We have previously shown the presence of termination signals within the dnaN coding region (Armengod, M.E., and Lambíes, E. (1986) Gene (Amst.) 43, 183-196). Therefore, we propose that the polarity produced by nonsense mutations in dnaN is primarily transcriptional. The uncoupling of transcription and translation of the dnaN gene (when translation is interrupted by premature nonsense codons or by other mechanisms) probably results in transcription termination at termination signals in dnaN.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
263
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
12109-14
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Transcriptional organization of the dnaN and recF genes of Escherichia coli K-12.
pubmed:affiliation
Instituto de Investigaciones Citólogicas, Obra Social de la Caja de Ahorros de Valencia, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't