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M9550094.TXT
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1995-03-04
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Document 0094
DOCN M9550094
TI Relative binding free energies of peptide inhibitors of HIV-1 protease:
the influence of the active site protonation state.
DT 9505
AU Chen X; Tropsha A; Laboratory for Molecular Modeling, School of
Pharmacy, University; of North Carolina, Chapel Hill 27599.
SO J Med Chem. 1995 Jan 6;38(1):42-8. Unique Identifier : AIDSLINE
MED/95139034
AB Hydrogen bonding plays an important role in the stabilization of
complexes between HIV-1 protease (HIV-1 PR) and its inhibitors. The
adequate treatment of the protease active site protonation state is
important for accurate molecular simulations of the protonation state is
important for accurate molecular simulations of the protease-inhibitor
complexes. We have applied the free energy simulation/thermodynamic
cycle approach to evaluate the relative binding affinities of the S vs R
isomers of the U85548E inhibitor of the protease. Several mono- and
diprotonation states of the catalytic aspartic acid residues of the
protease active site were considered in the course of molecular
simulations. The calculated difference in binding free energy of the S
vs R isomers strongly depended on the location of proton(s), but in all
cases the binding free energy of the S inhibitor was higher. On the
basis of our calculations, we propose that in the HIV-1 PR-inhibitor
complex only one catalytic aspartic acid residue is protonated and that
the binding free energy of the S isomer is ca. 2.8 kcal/mol higher than
that of the R isomer. The accuracy of these predictions shall be
evaluated when binding affinities of both isomers become available.
DE Amino Acid Sequence Aspartic Acid/METABOLISM Binding Sites
Comparative Study Energy Transfer HIV Protease/*CHEMISTRY/*METABOLISM
HIV Protease Inhibitors/*CHEMISTRY Models, Chemical Molecular Sequence
Data Oligopeptides/CHEMISTRY/METABOLISM
Peptides/*CHEMISTRY/*METABOLISM Protein Binding Protons Solutions
Stereoisomers Support, Non-U.S. Gov't Thermodynamics JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).