Linked Life Data

14756777

Source:http://linkedlifedata.com/resource/pubmed/id/14756777

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2004-2-3
pubmed:abstractText
Elevated dnaA expression from a multicopy plasmid induces more frequent initiation from the Escherichia coli replication origin, oriC, but viability is maintained. In comparison, chromosomally encoded dnaAcos also stimulates initiation, but this is lethal. By quantitative methods, we show that the level of initiation induced by elevated dnaA expression leads to collapsed replication forks that are mostly within 10 map units of oriC. Because forks collapse randomly, nucleoprotein complexes at specific sites such as datA are not the cause. When replication restart is blocked by a mutation in recB or priA, the increased initiations via elevated dnaA expression causes inviability. The amount of collapsed forks is substantially higher under elevated expression of dnaAcos compared to that of dnaA. We propose that the lethal phenotype of chromosomally encoded dnaAcos is a result of hyperinitiation that overwhelms the repair capacity of the cell.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
51
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
349-58
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Hyperinitiation of DNA replication in Escherichia coli leads to replication fork collapse and inviability.
pubmed:affiliation
Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824-1319, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't