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M9650525.TXT
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1996-03-09
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Document 0525
DOCN M9650525
TI Extension of the polarity-dependent switch phenomenon of the gp120
binding domain as a target for antiviral chemotherapy.
DT 9605
AU Graf von Stosch A; Kinzel V; Reed J; Department of Pathochemistry,
German Cancer Research Center,; Heidelberg, Germany.
SO Biochemistry. 1996 Jan 16;35(2):411-7. Unique Identifier : AIDSLINE
MED/96140213
AB A 15-residue fragment within the major continuous domain of gp120 from
HIV-1 that can bind independently to the CD4 receptor has been shown to
have the property of behaving as a solvent polarity-dependent
conformational switch. The switch behavior (cooperative transition from
beta-sheet to helical conformation as a function of solvent polarity),
which is conserved among strains with the widest sequence variability
possible, appears to be a prerequisite for the CD4-binding ability. A
number of switch inhibitors have been identified that destroy the
conformational switch in the 15-residue fragment and concurrently its
ability to bind to CD4-expressing cells. It can now be shown that the
switch behavior and its inhibition by substances with certain shared
structural characteristics are not restricted to the 15-residue
subfragment, but are reflected by the behavior of the entire 44-residue
binding domain. Further, substances active as switch inhibitors have an
immediate effect on the conformation of the 44-residue fragment in
aqueous buffer whereas inactive substances do not. The predictive value
of this as a screening method is demonstrated in testing a number of new
potential switch inhibitory compounds.
DE Amino Acid Sequence Antigens, CD4/METABOLISM Antiviral
Agents/*PHARMACOLOGY Binding Sites Circular Dichroism Drug
Screening/METHODS Human HIV Envelope Protein gp120/CHEMISTRY/*DRUG
EFFECTS/GENETICS HIV-1/CHEMISTRY/*DRUG EFFECTS/GENETICS In Vitro
Molecular Sequence Data Molecular Structure Nuclear Magnetic Resonance
Peptide Fragments/CHEMISTRY/DRUG EFFECTS/GENETICS Protein Conformation
Solvents JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).