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1996-02-26
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Document 0954
DOCN M9620954
TI 3D-QSAR of human immunodeficiency virus (I) protease inhibitors. III.
Interpretation of CoMFA results.
DT 9602
AU Opera TI; Waller CL; Marshall GR; Center for Molecular Design,
Washington University School of; Medicine, St. Louis, MO 63130, USA.
SO Drug Des Discov. 1994 Jul;12(1):29-51. Unique Identifier : AIDSLINE
MED/96062924
AB Comparative Molecular Field Analysis (CoMFA), a three-dimensional
quantitative structure-activity relationship (3D-QSAR) paradigm (Cramer,
R.D.; et al. (1988), J. Am. Chem. Soc., 110, 5959-5967), correlates
variations in the (experimental) biological activity with 3D variance in
the steric and electrostatic field of modeled compounds. Of general
interest to the drug design area is the interpretation of CoMFA results,
in order to gain maximum benefit from an established 3D-QSAR model.
CoMFA studies report results using the standard deviation (stdev)
times(*) coefficient (beta) field and its contributions to make SAR
statements. This field is the scalar product of the absolute stdev of
the CoMFA field at a lattice point and the QSAR equation coefficient
(beta) at the same point. Negative beta values yield detrimental
contributions, while positive beta values are considered beneficial. The
QSAR equation is based on actual field values, therefore both positive
and negative field values can have beneficial effect to the target
property (Y), depending on the sign of beta. The results of a CoMFA
model on 59 HIV-1 protease (HIV-PR) inhibitors (Waller, C.L.; et al.
(1993), J. Med. Chem., 36, 4152-4160) were compared with the HIV-PR
crystal structure to analyze the correspondence between CoMFA fields and
ligand binding regions in the enzyme. Local steric and electrostatic
interactions were analyzed in terms of various field values and beta
coefficients. While redundant for some regions, other field contours
besides stdev* beta bring additional information. Using this method, we
observed a unique region with negative beta values for the electrostatic
field (based on a -1 charged probe) located opposite of the scissile
bond, between P1 and P1', where steric stdev* beta values are positive.
Four hydrophobic residues in the HIV-PR crystal delimit the region,
which is suggested as a new potential hydrophobic binding site for the
inhibitors. The same region was confirmed using the stdev* beta contours
of a HINT (Kellogg, G.; et al. (1991), J. Comput.-Aided Mol. Design, 5,
545-552) calculation on the same model. The steric, electrostatic and
lipophilic fields of the CoMFA and HINT models are presented in various
forms, and the information extracted is detailed.
DE Binding Sites Chemistry, Physical/METHODS Comparative Study Drug
Design HIV Protease Inhibitors/*CHEMISTRY/*METABOLISM/PHARMACOLOGY
HIV-1/*ENZYMOLOGY Models, Molecular Molecular Conformation Protein
Binding Protein Conformation Structure-Activity Relationship JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).