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M9470038.TXT
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1994-07-02
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Document 0038
DOCN M9470038
TI TAR RNA-binding protein is an inhibitor of the interferon-induced
protein kinase PKR.
DT 9409
AU Park H; Davies MV; Langland JO; Chang HW; Nam YS; Tartaglia J; Paoletti
E; Jacobs BL; Kaufman RJ; Venkatesan S; Laboratory of Molecular
Microbiology, National Institute of; Allergy and Infectious Diseases,
Bethesda, MD 20892.
SO Proc Natl Acad Sci U S A. 1994 May 24;91(11):4713-7. Unique Identifier :
AIDSLINE MED/94255397
AB A cDNA encoding a double-stranded-RNA (dsRNA)-binding protein was
isolated by screening a HeLa cell cDNA expression library for proteins
that bind the HIV-1 Rev-responsive-element RNA. The cDNA encoded a
protein that was identical to TRBP, the previously reported cellular
protein that binds the transactivation response element (TAR) RNA of
human immunodeficiency virus type 1. TRBP inhibited phosphorylation of
the interferon-induced ribosome-associated protein kinase PKR and of the
eukaryotic translation initiation factor eIF-2 alpha in a
transient-expression system in which the translation of a reporter gene
was inhibited by the localized activation of PKR. TRBP expression in
HeLa cells complemented the growth and protein-synthesis defect of a
vaccinia virus mutant lacking the expression of the dsRNA-binding
protein E3L. These results implicate TRBP as a cellular regulatory
protein that binds RNAs containing specific secondary structure(s) to
mediate the inhibition of PKR activation and stimulate translation in a
localized manner.
DE eIF-2/METABOLISM Animal Bacterial Proteins/*METABOLISM Cell Line
Enzyme Induction Genetic Complementation Test Hela Cells Human
Interferons/*PHARMACOLOGY Membrane Proteins/*METABOLISM Phenotype
Phosphorylation Protein-Serine-Threonine Kinases/*ANTAGONISTS & INHIB/
BIOSYNTHESIS RNA-Binding Proteins/*METABOLISM Support, U.S. Gov't,
P.H.S. Vaccinia Virus/GENETICS/PHYSIOLOGY Virus Replication/GENETICS
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).