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M9620400.TXT
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1996-02-26
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Document 0400
DOCN M9620400
TI Polypyrimidine tract-binding protein and heterogeneous nuclear
ribonucleoprotein A1 bind to human T-cell leukemia virus type 2 RNA
regulatory elements.
DT 9602
AU Black AC; Luo J; Watanabe C; Chun S; Bakker A; Fraser JK; Morgan JP;
Rosenblatt JD; Division of Hematology/Oncology, University of
California, Los; Angeles 90095-1678, USA.
SO J Virol. 1995 Nov;69(11):6852-8. Unique Identifier : AIDSLINE
MED/96013782
AB Efficient expression of human T-cell leukemia virus (HTLV) and human
immunodeficiency virus structural proteins requires Rx and Rev proteins,
respectively. Decreased expression of Gag and Env appears to be due, in
part, to intragenic RNA sequences, termed cis-acting repressive
sequences (CRS), and may be mediated by binding of specific cellular
factors. We demonstrated previously that two cellular proteins, p60CRS
and p40CRS, interact with HTLV type 2.5' long terminal repeat CRS RNA
and that the interaction of both proteins with CRS RNA correlates with
function (A. C. Black, C. T. Ruland, J. Luo, A. Bakker, J. K. Fraser,
and J. D. Rosenblatt, Virology 200:29-41, 1994). By
radioimmunoprecipitation of HeLa nuclear proteins UV cross-linked to CRS
RNAs with murine monoclonal antibodies, we now show that p40CRS is
heterogeneous nuclear ribonucleoprotein (hnRNP) A1 and p60CRS is
polypyrimidine tract-binding protein or hnRNP I. These
immunoprecipitation results were confirmed by an immunobinding assay
with hnRNP I and hnRNP AI antibodies and by cross-competition
electrophoretic mobility shift experiments. In addition, we mapped a
putative hnRNP A1 binding site in U5 RNA and demonstrated that p40CRS
(hnRNP A1) binding to that site correlates with CRS function. Since both
hnRNP I and hnRNP A1 have been shown to influence splicing and
potentially other steps in RNA processing, the binding of both hnRNP I
and hnRNP A1 to HTLV RNA regulatory elements may alter retrovirus RNA
processing and may be involved in regulation by Rex.
DE Base Sequence Binding Sites Chloramphenicol
Acetyltransferase/BIOSYNTHESIS Gene Expression Gene Expression
Regulation, Viral Gene Products, env/BIOSYNTHESIS Gene Products,
gag/BIOSYNTHESIS Human HTLV-II/GENETICS/*PHYSIOLOGY Molecular
Sequence Data Mutagenesis, Site-Directed Oligodeoxyribonucleotides
Oligonucleotides, Antisense *Regulatory Sequences, Nucleic Acid
Ribonucleoproteins/*METABOLISM RNA-Binding Proteins/*METABOLISM
Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S. Transfection
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).