Linked Life Data

138682

Source:http://linkedlifedata.com/resource/pubmed/id/138682

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1977-4-15
pubmed:abstractText
The ability of various kinds of RNA molecules to activate the ATP hydrolysis reaction catalyzed by the p transcription termination factor from Escherichia coli has been studied. The most active RNA polymers are those containing cytidylate residues and very little ordered structure. Free poly(C) is the most active homopolymer; it is 45 times more active than poly(U), which is the only non-cytidine containing RNA that has detectable activity. Poly(C) has no activity when complexed with poly(I) or when the chain lengths are shorter than 22 nucleotides long. Although cytidylate residues are important they need not be frequent; a random copolymer of uridine and cytidine nucleotides with as few as 1 cytidylate residue out of 20 is as active as poly(C). The extent of activation with poly(C) depends on the ratio of p to poly(C). Poly(C) becomes saturated with p at a ratio of 1.8 ng of p/pmol poly(C), which is equivalent to one p monomer/27 nucleotides. A further increase in this ratio leads to a reduction in p activity. Decreasing the length of the poly(C) does not alter the observed saturation value but does decrease the rate of ATP hydrolysis when the RNA is in excess. The possible relevance of these results to p termination activity is discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
252
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1381-5
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1977
pubmed:articleTitle
Characterization of the nucleoside triphosphate phosphohydrolase (ATPase) activity of RNA synthesis termination factor p. II. Influence of synthetic RNA homopolymers and random copolymers on the reaction.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.