Identification and purification of cellular proteins that specifically interact with the RNA constitutive transport elements from retrovirus D.

Abstract:

:Human immunodeficiency virus (HIV) encodes a transacting protein, Rev, which interacts with an RNA element (RRE) to mediate nuclear export of unspliced viral mRNA. Recently, the RNA constitutive transport elements (CTE) from Mason-Pfizer monkey virus (MPMV) and simian retrovirus type I (SRV-1) were shown to render Rev-independent expression of gag, pol, or env genes in subgenomic constructs of HIV-1 and to support replication of HIV-1 mutants lacking RRE and Rev. Since CTEs act in cis, in the absence of any viral regulatory proteins, it is widely believed that they interact directly with the cellular export machinery by means of RNA-protein interaction. In this report, Electrophoretic mobility shift and UV-crosslinking assays were carried out to identify nuclear proteins that interact specifically with CTEs from both MPMV and SRV-1. Two of the four proteins (65 and 40 kDa, respectively) that bound CTE RNA did not interact in the same assays with RNA of a nonfunctional CTE mutant generated by site-directed mutagenesis. Both proteins have been partially purified. The nature of these proteins and their roles in RNA intracellular trafficking are currently under investigation.

journal_name

Virology

journal_title

Virology

authors

Tang H,Xu Y,Wong-Staal F

doi

10.1006/viro.1996.8407

subject

Has Abstract

pub_date

1997-02-17 00:00:00

pages

333-9

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(96)98407-X

journal_volume

228

pub_type

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