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M9610319.TXT
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1996-01-30
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Document 0319
DOCN M9610319
TI The amino terminal domain of HIV-1 Rev is required for discrimination of
the RRE from nonspecific RNA.
DT 9601
AU Daly TJ; Doten RC; Rusche JR; Auer M; Repligen Corporation, Cambridge,
MA 02139, USA.
SO J Mol Biol. 1995 Oct 20;253(2):243-58. Unique Identifier : AIDSLINE
MED/96036758
AB The ability of HIV-1 Rev to successfully discriminate between specific
Rev-responsive elements (RRE) and nonspecific binding sites in the
presence of excess nonspecific RNA was examined using filter binding,
gel shift, and gel filtration techniques, using purified M4 Rev mutant
protein and endoproteinase Lys-C cleaved wild-type Rev. The M4 Rev
displayed a slightly reduced binding affinity to the RRE, as well as a
tenfold decrease in its ability to discriminate the RRE from
non-specific RNA compared to the wild-type Rev. Gel shift and gel
filtration chromotography data also showed decreased ability of the
mutant to multimerize in the absence or presence of the RRE. The Lys-C
cleaved Rev, which lacks the amino-terminal 20 amino acids of the
protein, displayed less ability to discriminate the RRE from nonspecific
RNA compared to either the wild-type or the M4 mutant Rev and appeared
unable to form protein-protein interactions, yet still bound sense and
antisense RNA species with high affinity (Kd was in the nanomolar
concentration range). A 40 amino acid peptide containing the
arginine-rich RRE binding domain of Rev was also observed to interact
with both the RRE and antisense RNA fragments with a binding constant of
about 1 x 10(-9) M. However, the peptide displayed almost no ability to
discriminate between the RRE and a comparably sized antisense RRE. The
loss in ability to discriminate correct from incorrect binding sites
correlates with overall decreases in the alpha-helical character of the
protein and perturbations within the amino terminus. The amino terminus
of Rev is likely to maintain the conformational integrity of the
arginine rich RRE binding domain which is required for specific RNA
binding site discrimination or stabilization of specific Rev-RRE
interactions.
DE Amino Acid Sequence Base Sequence Binding Sites Binding, Competitive
Circular Dichroism Cloning, Molecular Comparative Study Escherichia
coli Gene Products, rev/*CHEMISTRY/ISOLATION & PURIF/*METABOLISM
HIV-1/*METABOLISM Kinetics Macromolecular Systems Mathematics
Models, Structural Models, Theoretical Molecular Sequence Data
*Nucleic Acid Conformation Peptide Fragments/CHEMISTRY/CHEMICAL
SYNTHESIS Recombinant Proteins/CHEMISTRY/ISOLATION & PURIF/METABOLISM
RNA, Antisense/*CHEMISTRY/ISOLATION & PURIF/METABOLISM RNA,
Viral/*CHEMISTRY/ISOLATION & PURIF/METABOLISM Substrate Specificity
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).