Title

Hydrophobic sliding: a possible mechanism for drug resistance in human immunodeficiency virus type 1 protease

PubMed ID

17292840

UMMS Affiliation

Department of Biochemistry and Molecular Pharmacology

Date

2-13-2007

Document Type

Article

Subjects

Amino Acids; Drug Resistance, Viral; HIV Protease; HIV Protease Inhibitors; Hydrogen Bonding; Hydrophobicity; Mutation; Protein Conformation

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Hydrophobic residues outside the active site of HIV-1 protease frequently mutate in patients undergoing protease inhibitor therapy; however, the mechanism by which these mutations confer drug resistance is not understood. From analysis of molecular dynamics simulations, 19 core hydrophobic residues appear to facilitate the conformational changes that occur in HIV-1 protease. The hydrophobic core residues slide by each other, exchanging one hydrophobic van der Waal contact for another, with little energy penalty, while maintaining many structurally important hydrogen bonds. Such hydrophobic sliding may represent a general mechanism by which proteins undergo conformational changes. Mutation of these residues in HIV-1 protease would alter the packing of the hydrophobic core, affecting the conformational flexibility of the protease. Therefore these residues impact the dynamic balance between processing substrates and binding inhibitors, and thus contribute to drug resistance.

Rights and Permissions

Citation: Structure. 2007 Feb;15(2):225-33. Link to article on publisher's site

Related Resources

Link to Article in PubMed