Functional analysis of the core human immunodeficiency virus type 1 packaging signal in a permissive cell line.

Abstract:

:Packaging of type C retrovirus genomic RNAs into budding virions requires a highly specific interaction between the viral Gag precursor and unique cis-acting packaging signals on the full-length RNA genome, allowing the selection of this RNA species from among a pool of spliced viral RNAs and similar cellular RNAs. This process is thought to involve RNA secondary and tertiary structural motifs since there is little conservation of the primary sequence of this region between retroviruses. To confirm RNA secondary structures, which we and others have predicted for this region, disruptive, compensatory, and deletion mutations were introduced into proviral constructs, which were then assayed in a permissive cell line. Disruption of either of two predicted stem-loops was found to greatly reduce RNA encapsidation and replication, whereas compensatory mutations restoring base pairing to these stem-loops had a wild-type phenotype. A GGNGR motif was identified in the loops of three hairpins in this region. Results were consistent with the hypothesis that the process of efficient RNA encapsidation is linked to dimerization. Replication and encapsidation were shown to occur at a reduced rate in the absence of the previously described kissing hairpin motif.

journal_name

J Virol

journal_title

Journal of virology

authors

Harrison GP,Miele G,Hunter E,Lever AM

doi

10.1128/JVI.72.7.5886-5896.1998

subject

Has Abstract

pub_date

1998-07-01 00:00:00

pages

5886-96

issue

7

eissn

0022-538X

issn

1098-5514

journal_volume

72

pub_type

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