Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
An intact TAR element and cytoplasmic localization are necessary for efficient packaging of human immunodeficiency virus type 1 genomic RNA
Autore:
Helga-Maria, C; Hammarskjold, ML; Rekosh, D;
Indirizzi:
Univol,rginia, Myles H Thaler Ctr Aids & Human Retrovirus Res, Dept Microbi Univ Virginia Charlottesville VA USA 22908 n Retrovirus Res, Dept Microbi
Titolo Testata:
JOURNAL OF VIROLOGY
fascicolo: 5, volume: 73, anno: 1999,
pagine: 4127 - 4135
SICI:
0022-538X(199905)73:5<4127:AITEAC>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
LATE REPLACEMENT VECTOR; CIS-ACTING SEQUENCES; HIV-1 REV PROTEIN; NUCLEOCAPSID PROTEIN; MATRIX PROTEIN; IN-VITRO; NUCLEAR-LOCALIZATION; MUTATIONAL ANALYSIS; NONDIVIDING CELLS; BINDING-SITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Rekosh, D Univol,rginia, Myles H Thaler Ctr Aids & Human Retrovirus Res, Dept Microbi Univ Virginia HSC Box 441 Charlottesville VA USA 22908 t Microbi
Citazione:
C. Helga-Maria et al., "An intact TAR element and cytoplasmic localization are necessary for efficient packaging of human immunodeficiency virus type 1 genomic RNA", J VIROLOGY, 73(5), 1999, pp. 4127-4135

Abstract

Although most reports defining the human immunodeficiency virus type 1 (HIV-1) genomic RNA packaging signal have focused on the region downstream of the major 5' splice site, others have suggested that sequences upstream of the splice site may also play an important role, In this study we have directly examined the role played by the HIV-1 TAR region in RNA packaging. Forthese experiments we used a proviral expression system that is largely independent of Tat for transcriptional activation. This allowed us to create constructs that efficiently expressed RNAs carrying mutations in TAR and to determine the ability of these RNAs to be packaged, Our results indicate that loss of sequences in TAR significantly reduce the ability of a viral RNAto be packaged. The requirement for TAR sequences in RNA packaging was further examined by using a series of missense mutations positioned throughoutthe entire TAR structure. TAR mutations previously shown to influence Tat transactivation, such as G31U in the upper loop region or UCU to AAG in thebulge (nucleotides [nt] 22 to 24), failed to have any effect on RNA packaging. Mutations which disrupted the portion of the TAR stem immediately below the bulge also had little effect. In contrast, dramatic effects on RNA packaging were observed with constructs containing mutations in the lower portion of the TAR stem, Point mutations which altered nt 5 to 9, 10 to 15, 44to 49, or 50 to 54 all reduced RNA packaging 11- to 25-fold. However, compensatory double mutations which restored the stem structure were able to restore packaging. These results indicate that an intact lower stem structure, rather than a specific sequence, is required for RNA packaging. Our results also showed that RNA molecules retained within the nucleus cannot be packaged, unless they are transported to the cytoplasm by either Rev/Rev response element or the Mason-Pfizer monkey virus constitutive transport element.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 06:25:24