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Updated: May 25, 2026

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Inhibition of HIV-1 protease: the rigidity perspective.

J W Heal1, J E Jimenez-Roldan, S A Wells

  • 1MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, UK. jack.heal@warwick.ac.uk

Bioinformatics (Oxford, England)
|February 1, 2012
PubMed
Summary
This summary is machine-generated.

HIV-1 protease inhibitors primarily affect the flexibility of the enzyme's β-hairpin flaps, not overall rigidity. Some drugs significantly alter flap rigidity, with tipranavir showing a strong, consistent effect.

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Area of Science:

  • Structural biology
  • Biophysics
  • Computational biology

Background:

  • Human immunodeficiency virus type 1 (HIV-1) protease is a critical target for antiviral therapies.
  • Protein rigidity analysis offers an efficient method to derive functional insights from crystal structures.

Purpose of the Study:

  • To assess the rigidity of HIV-1 protease using computational methods.
  • To investigate how various inhibitors impact enzyme rigidity, particularly the active site and flexible flaps.

Main Methods:

  • Utilized the software 'First' for rigidity analysis.
  • Analyzed 206 high-resolution X-ray crystal structures of HIV-1 protease.
  • Compared rigidity profiles with and without bound inhibitors.

Main Results:

  • Inhibitor binding minimally impacts the overall rigidity of the HIV-1 protease homodimer and its active site.
  • The primary effect of inhibitors is the constraint of β-hairpin flap flexibility.
  • HIV-1 protease inhibitors can be classified based on their effect on flap rigidity; tipranavir notably impacts flap rigidity.

Conclusions:

  • Flap flexibility is a key target for HIV-1 protease inhibitors.
  • Rigidity analysis can differentiate inhibitor mechanisms of action.
  • Tipranavir exhibits a distinct interaction profile affecting flap dynamics.