Linked Life Data

6302281

Source:http://linkedlifedata.com/resource/pubmed/id/6302281

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1983-6-23
pubmed:abstractText
We have purified the type III restriction enzymes EcoP1 and EcoP15 to homogeneity from bacteria that contain the structural genes for the enzymes cloned on small, multicopy plasmids and which overproduce the enzymes. Both of the enzymes contain two different subunits. The molecular weights of the subunits are the same for both enzymes and antibodies prepared against one enzyme cross-react with both subunits of the other. Bacteria containing a plasmid derivative in which a large part of one of the structural genes has been deleted have a restriction- modification+ phenotype and contain only the smaller of the two subunits. This subunit therefore must be the one that both recognizes the specific DNA sequence and methylates it in the modification reaction (the restriction enzyme itself also acts as a modification methylase). We have purified the P1 and P15 modification subunits from these deletion derivatives and have shown that in vitro they have the expected properties: they are sequence-specific modification methylases. In addition, we have demonstrated that strains carrying the full restriction/modification system also contain a pool of free modification subunits that might be responsible for in vivo modification.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
165
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
19-34
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
DNA restriction--modification enzymes of phage P1 and plasmid p15B. Subunit functions and structural homologies.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't