3OQD: Crystal Structures Of Multidrug-Resistant Clinical Isolate 769 Hiv-1 Protease Variants

The flexible flaps and the 80s loops (Pro79-Ile84) of HIV-1 protease are crucial in inhibitor binding. Previously, it was reported that the crystal structure of multidrug-resistant 769 (MDR769) HIV-1 protease shows a wide-open conformation of the flaps owing to conformational rigidity acquired by the accumulation of mutations. In the current study, the effect of mutations on the conformation of the 80s loop of MDR769 HIV-1 protease variants is reported. Alternate conformations of Pro81 (proline switch) with a root-mean-square deviation of 3-4.8 A in the C(alpha) atoms of the I10V mutant and a side chain with a `flipped-out' conformation in the A82F mutant cause distortion in the S1/S1' binding pockets that affects inhibitor binding. The A82S and A82T mutants show local changes in the electrostatics of inhibitor binding owing to the mutation from nonpolar to polar residues. In summary, the crystallographic studies of four variants of MDR769 HIV-1 protease presented in this article provide new insights towards understanding the drug-resistance mechanism as well as a basis for design of future protease inhibitors with enhanced potency.
PDB ID: 3OQDDownload
MMDB ID: 89686
PDB Deposition Date: 2010/9/2
Updated in MMDB: 2012/09
Experimental Method:
x-ray diffraction
Resolution: 1.71  Å
Source Organism:
Similar Structures:
Biological Unit for 3OQD: dimeric; determined by author and by software (PISA)
Molecular Components in 3OQD
Label Count Molecule
Proteins (2 molecules)
Hiv-1 Protease
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB