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Current Opinion in HIV & AIDS:
doi: 10.1097/COH.0b013e3283136cee
HIV protease inhibitors: Edited by Jon Schapiro and John Erickson

New approaches to HIV protease inhibitor drug design II: testing the substrate envelope hypothesis to avoid drug resistance and discover robust inhibitors

Nalam, Madhavi NL; Schiffer, Celia A

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Abstract

Purpose of review: Drug resistance results when the balance between the binding of inhibitors and the turnover of substrates is perturbed in favor of the substrates. Resistance is quite widespread to the HIV-1 protease inhibitors permitting the protease to process its 10 different substrates. This processing of the substrates permits the virus HIV-1 to mature and become infectious. The design of HIV-1 protease inhibitors that closely fit within the substrate-binding region is proposed to be a strategy to avoid drug resistance.

Recent findings: Cocrystal structures of HIV-1 protease with its substrates define an overlapping substrate-binding region or substrate envelope. Novel HIV-1 protease inhibitors that were designed to fit within this substrate envelope were found to retain high binding affinity and have a flat binding profile against a panel of drug-resistant HIV-1 proteases.

Summary: The avoidance of drug resistance needs to be considered in the initial design of inhibitors to quickly evolving targets such as HIV-1 protease. Using a detailed knowledge of substrate binding appears to be a promising strategy for achieving this goal to obtain robust HIV-1 protease inhibitors.

© 2008 Lippincott Williams & Wilkins, Inc.

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