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M9480510.TXT
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Document 0510
DOCN M9480510
TI Three-dimensional quantitative structure-activity relationship of human
immunodeficiency virus (I) protease inhibitors. 2. Predictive power
using limited exploration of alternate binding modes.
DT 9410
AU Oprea TI; Waller CL; Marshall GR; Center for Molecular Design,
Washington University School of; Medicine, St. Louis, Missouri
63130-4866.
SO J Med Chem. 1994 Jul 8;37(14):2206-15. Unique Identifier : AIDSLINE
MED/94309074
AB NewPred, a semiautomated procedure to evaluate alternate binding modes
and assist three dimensional quantitative structure-activity
relationship (3D-QSAR) studies in predictive power evaluation is
exemplified with a series of 30 human immunodeficiency virus 1 protease
(HIV PR) inhibitors. Five comparative molecular field analysis (CoMFA)
models (Waller, C. L.; et al. J. Med. Chem. 1993, 36, 4152-4160) based
on 59 HIV-PR inhibitors were tested. The test set included 18 compounds
(set A) having a different transition state isostere (TSI),
hydroxyethylurea (Getman, D. P.; et al. J. Med. Chem. 1993, 36,
288-291), to investigate the binding mode in P1' and P2'. Twelve
dihyroxyethylenes (set B) (Thaisrivongs, S.; et al. J. Med. Chem. 1993,
36, 941-952) were used to investigate binding in P2 and P3 as well as in
P2' and P3'. Six other compounds with known or inferred binding
structure (set C) were part of the test set, but not investigated with
NewPred. Each compound was aligned in accordance to predefined alignment
rules for the training set prior to the inclusion in the test set
(except for set C). Using NewPred, geometrically different conformers
for each compound were generated and individually relaxed in the HIV-PR
binding site. Energy comparisons allowed selection of lowest energy
structures to be included in the test set. Only in vacuo minimized
conformers derived from low-energy complexes were used to determine the
predictive power of the five models (predictive r2 varied from 0.1 to
0.7 when two chemical and statistical outliers were excluded). Our
models correctly predict the poor inhibitor activity of
1(S)-amino-2(R)-hydroxyindan-containing peptides (set B), which is
explained and interpreted from a 3D-QSAR perspective. The use of a new,
flexibility-based, semiautomated method to explore alternate binding
models for 3D-QSAR models is demonstrated.
DE Amino Acid Sequence Binding Sites HIV Protease HIV Protease
Inhibitors/*CHEMISTRY/PHARMACOLOGY Models, Molecular Molecular
Conformation Molecular Sequence Data Structure-Activity Relationship
Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).