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M9610201.TXT
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1996-01-30
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Document 0201
DOCN M9610201
TI Double-stranded-RNA-dependent protein kinase and TAR RNA-binding protein
form homo- and heterodimers in vivo.
DT 9601
AU Cosentino GP; Venkatesan S; Serluca FC; Green SR; Mathews MB; Sonenberg
N; Department of Biochemistry, McGill University, Montreal, QC; Canada.
SO Proc Natl Acad Sci U S A. 1995 Oct 10;92(21):9445-9. Unique Identifier :
AIDSLINE MED/96003795
AB The yeast two-hybrid system and far-Western protein blot analysis were
used to demonstrate dimerization of human double-stranded RNA
(dsRNA)-dependent protein kinase (PKR) in vivo and in vitro. A
catalytically inactive mutant of PKR with a single amino acid
substitution (K296R) was found to dimerize in vivo, and a mutant with a
deletion of the catalytic domain of PKR retained the ability to
dimerize. In contrast, deletion of the two dsRNA-binding motifs in the
N-terminal regulatory domain of PKR abolished dimerization. In vitro
dimerization of the dsRNA-binding domain required the presence of dsRNA.
These results suggest that the binding of dsRNA by PKR is necessary for
dimerization. The mammalian dsRNA-binding protein TRBP, originally
identified on the basis of its ability to bind the transactivation
region (TAR) of human immunodeficiency virus RNA, also dimerized with
itself and with PKR in the yeast assay. Taken together, these results
suggest that complexes consisting of different combinations of
dsRNA-binding proteins may exist in vivo. Such complexes could mediate
differential effects on gene expression and control of cell growth.
DE Amino Acid Sequence Human Molecular Sequence Data Protein Binding
Protein Conformation Protein-Serine-Threonine
Kinases/GENETICS/*METABOLISM Recombinant Fusion Proteins/METABOLISM
RNA-Binding Proteins/GENETICS/*METABOLISM Sequence Deletion
Structure-Activity Relationship Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. Trans-Activation (Genetics) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).