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Titolo:
A SUBOPTIMAL 5'-SPLICE-SITE IS A CIS-ACTING DETERMINANT OF NUCLEAR EXPORT OF POLYOMAVIRUS LATE MESSENGER-RNAS
Autore:
HUANG YQ; CARMICHAEL GG;
Indirizzi:
UNIV CONNECTICUT,CTR HLTH,DEPT MICROBIOL FARMINGTON CT 06030
Titolo Testata:
Molecular and cellular biology
fascicolo: 11, volume: 16, anno: 1996,
pagine: 6046 - 6054
SICI:
0270-7306(1996)16:11<6046:AS5IAC>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRE-MESSENGER-RNA; INDEPENDENT GENE-EXPRESSION; REV ACTIVATION DOMAIN; VIRUS TYPE-1 REV; NUCLEOCYTOPLASMIC TRANSPORT; SIMIAN VIRUS-40; LEADER EXON; SEQUENCES; CYTOPLASM; ELEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
Y.Q. Huang e G.G. Carmichael, "A SUBOPTIMAL 5'-SPLICE-SITE IS A CIS-ACTING DETERMINANT OF NUCLEAR EXPORT OF POLYOMAVIRUS LATE MESSENGER-RNAS", Molecular and cellular biology, 16(11), 1996, pp. 6046-6054

Abstract

Mouse polyomavirus has been used as a model system to study nucleocytoplasmic transport of mRNA. Three late mRNAs encoding the viral capsidproteins are generated by alternative splicing from common pre-mRNA molecules, mRNAs Encoding the virion protein VP2 (mVP2) harbor an unused 5' splice site, and more than half of them remain fully unspliced yet are able to enter the cytoplasm for translation, Examination of the intracellular distribution of late viral mRNAs revealed, however, thatmVP2 molecules are exported less efficiently than are mVP1 and mVP3, in which the 5' splice site has been removed by splicing. Point mutations and deletion analyses demonstrated that the efficiency of mVP2 export is inversely correlated with the strength of the 5' splice site and that unused 3' splice sites present in the mRNA have little or no effect on export. These results suggest that the unused 5' splice site is a key player in mVP2 export, Interestingly, mRNAs carrying ed a wild-type mVP2 export phenotype, suggesting that large deletions but retaining the 5' splice site exhibited there are no other constitutive cis-acting sequences involved in mVP2 export, RNA stability measurements confirmed that the subcellular distribution differences between these mRNAs were not due to differential half-lives between the two cellular compartments. We therefore conclude that the nuclear export of mVP2 isstrongly influenced by a suboptimal 5' splice site, Furthermore, results comparing spliced and unspliced forms of mVP2 molecules indicated that the process of splicing does not enhance nuclear export. Since mVP2 and some of its mutant forms can accumulate in the cytoplasm in theabsence of splicing, we propose that splicing is not a prerequisite for mRNA export in the polyomavirus system; rather, removal of splicingmachinery from mRNAs may be required. The possibility that export of other viral mRNAs can be influenced bg suboptimal splicing signals is also discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 11:31:11