Linked Life Data

2834368

Source:http://linkedlifedata.com/resource/pubmed/id/2834368

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
13
pubmed:dateCreated
1988-6-6
pubmed:abstractText
Transcription termination in vitro by vaccinia RNA polymerase is dependent on a trans-acting factor, VTF, that is associated with, if not identical to, the vaccinia mRNA capping enzyme. VTF-induced termination occurs approximately 50 nucleotides downstream of a signal sequence TTTTTNT in the non-transcribed templated strand; thus the cognate sequence UUUUUNU is expressed in the nascent RNA. To address the role of the nascent RNA in chain termination, the effects of nucleotide base analog substitutions were studied. Incorporation of bromo- (Br) UMP or iodo- (I) UMP into RNA abrogated factor-dependent termination without preventing the synthesis of read-through transcripts. Substitution of either ITP or 7'-methylguanosine for GTP did not inhibit factor-dependent termination, nor did the substitution of BrCTP or ICTP for CTP. The early transcripts synthesized in vitro were sensitive to RNase T2 but resistant to RNase H, indicating an absence of extensive hybridization of RNA product to the DNA template. Substitution of BrUTP for UTP did not alter the nuclease sensitivity of the transcripts, suggesting that increased stability of RNA:DNA hybrid structures did not account for the analog effects. These results are consistent with a model in which recognition of the primary sequence UUUUUNU in nascent RNA by the polymerase and/or VTF is required for transcription termination.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
263
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6220-5
pubmed:dateRevised
2008-8-19
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Factor-dependent transcription termination by vaccinia virus RNA polymerase. Evidence that the cis-acting termination signal is in nascent RNA.
pubmed:affiliation
Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.
pubmed:publicationType
Journal Article