1TCX image
Deposition Date 1996-06-05
Release Date 1996-12-07
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1TCX
Title:
HIV TRIPLE MUTANT PROTEASE COMPLEXED WITH INHIBITOR SB203386
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:HIV PROTEASE
Gene (Uniprot):gag-pol
Mutations:I32V, V47I, I82V
Chain IDs:A, B
Chain Length:99
Number of Molecules:2
Biological Source:Human immunodeficiency virus 1
Ligand Molecules
Primary Citation
Human immunodeficiency virus protease ligand specificity conferred by residues outside of the active site cavity.
Biochemistry 35 10279 10286 (1996)
PMID: 8756683 DOI: 10.1021/bi960179j

Abstact

To gain greater understanding of the structural basis of human immunodeficiency virus (HIV) protease ligand specificity, we have crystallized and determined the structures of the HIV-1 protease (Val32Ile, Ile47Val, Val82Ile) triple mutant and simian immunodeficiency virus (SIV) protease in complex with SB203386, a tripeptide analogue inhibitor containing a C-terminal imidazole substituent as an amide bond isostere. SB203386 is a potent inhibitor of HIV-1 protease (Ki = 18 nM) but shows decreased inhibition of the HIV-1 protease (Val32Ile, Ile47Val, Val82Ile) triple mutant (Ki = 112 nM) and SIV protease (Ki = 960 nM). Although SB203386 binds in the active site cavity of the triple mutant in a similar fashion to its binding to the wild-type HIV-1 protease [Abdel-Meguid et al. (1994) Biochemistry 33, 11671], it binds to SIV protease in an unexpected mode showing two inhibitor molecules each binding to half of the active site. Comparison of these two structures and that of the wild-type HIV-1 protease bound to SB203386 reveals that HIV protease ligand specificity is imparted by residues outside of the catalytic pocket, which causes subtle changes in its shape. Furthermore, this work illustrates the importance of structural studies in order to understand the structure-activity relationship (SAR) between related enzymes.

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Primary Citation of related structures