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M9640570.TXT
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1996-03-04
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Document 0570
DOCN M9640570
TI Human PKR transfected into murine cells stimulates expression of genes
under control of the HIV1 or HTLV-I LTR.
DT 9604
AU Meurs EF; McMillan N; Williams BR; Hovanessian AG; Southern PJ;
Department of Microbiology, University of Minnesota, Minneapolis;
55455-0312, USA.
SO Virology. 1995 Dec 20;214(2):653-9. Unique Identifier : AIDSLINE
MED/96130209
AB We have analyzed the effect of transfection into murine NIH/3T3 cells of
the human dsRNA-activated kinase PKR on the expression of the
beta-galactosidase reporter gene, placed under control of the HIV1 or
the HTLV-I LTR. beta-Galactosidase expression is stimulated when the
reporter plasmids are cotransfected with wild-type PKR but inhibited
when cotransfected with a catalytically inactive mutant PKR. In the case
of HIV1, beta-galactosidase expression was not stimulated when
cotransfection was carried out with PKR harboring mutations in the dsRNA
binding domains, indicating that stimulation depends on the classical
mode of PKR activation through dsRNA binding. In contrast, the dsRNA
binding mutants of PKR could still partially stimulate
beta-galactosidase expression from the HTLV-I LTR, suggesting that PKR
activation in this case may involve different/additional mechanisms.
These results show that, in addition to the known down-regulation of
protein synthesis through elF2 phosphorylation, PKR can also positively
stimulate gene expression in vivo, most probably through phosphorylation
of a substrate distinct from elF2.
DE beta-Galactosidase/GENETICS Amino Acid Sequence Animal Binding Sites
*Gene Expression Regulation, Enzymologic *Gene Expression Regulation,
Viral Genes, Reporter Human HIV Long Terminal Repeat/*GENETICS
HIV-1/*GENETICS HTLV-I/*GENETICS Mice Molecular Sequence Data
Mutation Protein-Serine-Threonine Kinases/GENETICS/*METABOLISM
Repetitive Sequences, Nucleic Acid/*GENETICS Structure-Activity
Relationship Support, Non-U.S. Gov't Transfection 3T3 Cells JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).