Linked Life Data

10215858

Source:http://linkedlifedata.com/resource/pubmed/id/10215858

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1999-5-17
pubmed:abstractText
Polyadenylation of mRNA has been shown to target the RNA molecule for rapid exonucleolytic degradation in bacteria. To elucidate the molecular mechanism governing this effect, we determined whether the Escherichia coli exoribonuclease polynucleotide phosphorylase (PNPase) preferably degrades polyadenylated RNA. When separately incubated with each molecule, isolated PNPase degraded polyadenylated and non-polyadenylated RNAs at similar rates. However, when the two molecules were mixed together, the polyadenylated RNA was degraded, whereas the non-polyadenylated RNA was stabilized. The same phenomenon was observed with polyuridinylated RNA. The poly(A) tail has to be located at the 3' end of the RNA, as the addition of several other nucleotides at the 3' end prevented competition for polyadenylated RNA. In RNA-binding experiments, E. coli PNPase bound to poly(A) and poly(U) sequences with much higher affinity than to poly(C) and poly(G). This high binding affinity defines poly(A) and poly(U) RNAs as preferential substrates for this enzyme. The high affinity of PNPase for polyadenylated RNA molecules may be part of the molecular mechanism by which polyadenylated RNA is preferentially degraded in bacterial cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:volume
261
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
468-74
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Preferential degradation of polyadenylated and polyuridinylated RNAs by the bacterial exoribonuclease polynucleotide phosphorylase.
pubmed:affiliation
Department of Biology, Israel Institute of Technology, Haifa, Israel.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't