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M9460218.TXT
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1994-06-12
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Document 0218
DOCN M9460218
TI Energy calculations and analysis of HIV-1 protease-inhibitor crystal
structures.
DT 9408
AU Gustchina A; Sansom C; Prevost M; Richelle J; Wodak SY; Wlodawer A;
Weber IT; Macromolecular Structure Laboratory, NCI-Frederick Cancer;
Research and Development Center, MD 21702.
SO Protein Eng. 1994 Mar;7(3):309-17. Unique Identifier : AIDSLINE
MED/94233033
AB The interactions between HIV-1 protease and its bound inhibitors have
been investigated by molecular mechanics calculations and by analysis of
crystal structures of the complexes in order to determine general rules
for inhibitor and substrate binding to the protease. Fifteen crystal
structures of HIV-1 protease with different peptidomimetic inhibitors
showed conservation of hydrogen bond interactions between the main chain
C = O and NH groups of the inhibitors and the C = O and NH groups of the
protease extending from P3 C = O to P3' NH. The mean length of the
hydrogen bonds between the inhibitor and the flexible flaps and the
conserved water molecule (2.9 A) is slightly shorter than the mean
length of hydrogen bonds between the inhibitor and the more rigid active
site region (3.1 A) of the protease. The two hydrogen bonds between the
conserved water and P2 and P1' carbonyl oxygen atoms of the inhibitor
are the shortest and are predicted to be important for the tight binding
of inhibitors. Molecular mechanics analysis of three crystal structures
of HIV-1 protease with different inhibitors with independent
calculations using the programs Discover and Brugel gave an estimate of
56-68% for the contribution of all the inhibitor main chain atoms to the
total calculated protease-inhibitor interaction energy. The contribution
of individual inhibitor residues to the interaction energy was
calculated using Brugel. The main chain atoms of residue P2 had a
consistently large favorable contribution to the total interaction
energy, probably due to the presence of the two short hydrogen bonds to
the flexible flap.(ABSTRACT TRUNCATED AT 250 WORDS)
DE Amino Acid Sequence Chemistry, Physical Crystallization Hydrogen
Bonding HIV Protease/*CHEMISTRY/METABOLISM HIV Protease
Inhibitors/*CHEMISTRY/METABOLISM HIV-1/*ENZYMOLOGY Models, Molecular
Molecular Sequence Data Support, U.S. Gov't, P.H.S. Thermodynamics
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).