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Updated: May 31, 2026

Conformational Evaluation of HIV-1 Trimeric Envelope Glycoproteins Using a Cell-based ELISA Assay
Published on: September 14, 2014
Dynamics of preferential substrate recognition in HIV-1 protease: redefining the substrate envelope
Ayşegül Ozen1, Türkan Haliloğlu, Celia A Schiffer
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Drug resistance in HIV-1 protease (PR) limits antiviral therapy. A dynamic substrate envelope model improves understanding of how resistant HIV-1 PR variants recognize diverse substrates, aiding new drug design.
Area of Science:
- Biochemistry
- Virology
- Drug Discovery
Background:
- Human immunodeficiency virus type 1 protease (HIV-1 PR) is essential for viral maturation.
- HIV-1 protease inhibitors (PIs) are key components of antiviral therapy, but drug resistance is a significant challenge.
- Drug-resistant HIV-1 PR variants can still process viral substrates, necessitating new therapeutic strategies.
Purpose of the Study:
- To investigate the role of protein dynamics in HIV-1 PR-substrate interactions.
- To refine the concept of the substrate envelope to account for conformational flexibility.
- To develop a more accurate model for designing drugs against drug-resistant HIV-1 PR variants.
Main Methods:
- Molecular dynamics simulations of seven HIV-1 PR-substrate complexes.
- Estimation of conformational flexibility of bound substrates.
- Development of a dynamic substrate envelope model using probability distribution functions.
Main Results:
- HIV-1 PR substrates bind within a conserved three-dimensional shape, the substrate envelope.
- Resistance mutations often occur in regions where PIs, but not substrates, interact.
- A dynamic substrate envelope, considering protein flexibility, provides a more accurate representation of PR-substrate interactions.
- Interactions between substrates and protease can compensate for sequence variations, enabling recognition of diverse substrates.
Conclusions:
- The dynamic substrate envelope model offers a refined understanding of HIV-1 PR-substrate recognition.
- This model can guide the design of novel antiviral drugs less susceptible to resistance.
- Targeting ensembles of resistant HIV-1 PR variants is a promising strategy for future drug development.
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