Linked Life Data

12634054

Source:http://linkedlifedata.com/resource/pubmed/id/12634054

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2003-3-13
pubmed:abstractText
The SgrAI endonuclease usually cleaves DNA with two recognition sites more rapidly than DNA with one site, often converting the former directly to the products cut at both sites. In this respect, SgrAI acts like the tetrameric restriction enzymes that bind two copies of their target sites before cleaving both sites concertedly. However, by analytical ultracentrifugation, SgrAI is a dimer in solution though it aggregates to high molecular mass species when bound to its specific DNA sequence. Its reaction kinetics indicate that it uses different mechanisms to cleave DNA with one and with two SgrAI sites. It cleaves the one-site DNA in the style of a dimeric restriction enzyme acting at an individual site, mediating neither interactions in trans, as seen with the tetrameric enzymes, nor subunit associations, as seen with the monomeric enzymes. In contrast, its optimal reaction on DNA with two sites involves an association of protein subunits: two dimers bound to sites in cis may associate to form a tetramer that has enhanced activity, which then cleaves both sites concurrently. The mode of action of SgrAI differs from all restriction enzymes characterised previously, so this study extends the range of mechanisms known for restriction endonucleases.
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
28
pubmed:volume
327
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
579-91
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Subunit assembly for DNA cleavage by restriction endonuclease SgrAI.
pubmed:affiliation
Department of Biochemistry, School of Medical Sciences, University of Bristol, University Walk, BS8 1TD, Bristol, UK.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't