Linked Life Data

2163765

Source:http://linkedlifedata.com/resource/pubmed/id/2163765

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1990-8-14
pubmed:abstractText
Previous work has shown that a cis-acting locus (termed par for partitioning) on the pSC101 plasmid accomplishes its stable inheritance in dividing cell populations. We report here that the DNA of pSC101 derivatives lacking the par region shows a decrease in overall superhelical density as compared with DNA of wild-type pSC101. Chemicals and bacterial mutations that reduce negative DNA supercoiling increase the rate of loss of par plasmids and convert normally stable plasmids that have minimal par region deletions into unstable replicons. topA gene mutations, which increase negative DNA supercoiling, reverse the instability of partition-defective plasmids that utilize the pSC101, p15A, F, or oriC replication systems. Our observations show that the extent of negative supercoiling of plasmid DNA has major effects on the plasmid's inheritance and suggest a mechanism by which the pSC101 par region may exert its stabilizing effects.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0092-8674
pubmed:author
pubmed:issnType
Print
pubmed:day
13
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
127-33
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Role of DNA superhelicity in partitioning of the pSC101 plasmid.
pubmed:affiliation
Department of Genetics, Stanford University School of Medicine, California 94305-5120.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't