Linked Life Data

6455332

Source:http://linkedlifedata.com/resource/pubmed/id/6455332

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1981-10-25
pubmed:databankReference
pubmed:abstractText
We have determined the sequences of the ori region DNA of several phage lambda mutants and hybrids, which shed light on the mechanism of DNA replication in the lambdoid phages. These include the heterologous substitution hybrids lambda rep82:lambda and lambda rep80:lambda, a pseudorevertant of the ori-r93 mutant lambda r93hot5, and the insertion mutant lambda pk35. The ori regions of the three lambdoid phages, lambda, phi 80 and 82, all have repeated sequences, termed iterons, and A . T-rich zones. We note that a similar arrangement of DNA is also found in several other prokaryotic origins of replication. lambda and phi 80 have four iterons, and 82 has five. The origin of lambda r93hot5 is unusual in that contains only three iterons, yet the phage grows normally. Analysis of this mutant indicates that the spacing of iterons is crucial to ori function, whereas their number is not. This argues against the cloverleaf model for lambda ori structure (Hobom et al., 1979). In lambda pk35 the drug resistance element Tn903 is inserted into the "inceptor" (ice) site, proposed to be crucial for lambda replication initiation (Hobom et al., 1979); yet this phage grows normally.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0378-1119
pubmed:author
pubmed:issnType
Print
pubmed:volume
14
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
91-101
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:articleTitle
Sequence organization of the origins of DNA replication in lambdoid coliphages.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.