2P3C image
Entry Detail
PDB ID:
2P3C
Title:
Crystal Structure of the subtype F wild type HIV protease complexed with TL-3 inhibitor
Biological Source:
PDB Version:
Deposition Date:
2007-03-08
Release Date:
2007-04-24
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.26
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:protease
Mutations:Q7K
Chain IDs:A, B
Chain Length:99
Number of Molecules:2
Biological Source:Human immunodeficiency virus 1
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CME A CYS S,S-(2-HYDROXYETHYL)THIOCYSTEINE
Peptide-like Molecules
PRD_000434
Primary Citation
Structural Characterization of B and non-B Subtypes of HIV-Protease: Insights into the Natural Susceptibility to Drug Resistance Development.
J.Mol.Biol. 369 1029 1040 (2007)
PMID: 17467738 DOI: 10.1016/j.jmb.2007.03.049

Abstact

Although a majority of HIV-1 infections in Brazil are caused by the subtype B virus (also prevalent in the United States and Western Europe), viral subtypes F and C are also found very frequently. Genomic differences between the subtypes give rise to sequence variations in the encoded proteins, including the HIV-1 protease. The current anti-HIV drugs have been developed primarily against subtype B and the effects arising from the combination of drug-resistance mutations with the naturally existing polymorphisms in non-B HIV-1 subtypes are only beginning to be elucidated. To gain more insights into the structure and function of different variants of HIV proteases, we have determined a 2.1 A structure of the native subtype F HIV-1 protease (PR) in complex with the protease inhibitor TL-3. We have also solved crystal structures of two multi-drug resistant mutant HIV PRs in complex with TL-3, from subtype B (Bmut) carrying the primary mutations V82A and L90M, and from subtype F (Fmut) carrying the primary mutation V82A plus the secondary mutation M36I, at 1.75 A and 2.8 A resolution, respectively. The proteases Bmut, Fwt and Fmut exhibit sevenfold, threefold, and 54-fold resistance to TL-3, respectively. In addition, the structure of subtype B wild type HIV-PR in complex with TL-3 has been redetermined in space group P6(1), consistent with the other three structures. Our results show that the primary mutation V82A causes the known effect of collapsing the S1/S1' pockets that ultimately lead to the reduced inhibitory effect of TL-3. Our results further indicate that two naturally occurring polymorphic substitutions in subtype F and other non-B HIV proteases, M36I and L89M, may lead to early development of drug resistance in patients infected with non-B HIV subtypes.

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