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Related Experiment Videos

Programming the Rous sarcoma virus protease to cleave new substrate sequences

T W Ridky1, D Bizub-Bender, C E Cameron

  • 1Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.

The Journal of Biological Chemistry
|May 3, 1996
PubMed
Summary
This summary is machine-generated.

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Researchers engineered a Rous sarcoma virus protease (RSV PR) to mimic human immunodeficiency virus (HIV-1) PR. This modified RSV protease cleaves HIV-1 substrates and is inhibited by HIV-1 specific drugs, revealing key specificity determinants.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Retroviral proteases (PR) exhibit high substrate specificity, crucial for viral polyprotein processing.
  • Understanding these specificity determinants is key for designing targeted inhibitors.

Purpose of the Study:

  • To engineer a Rous sarcoma virus protease (RSV PR) with altered substrate specificity.
  • To investigate the role of enzyme symmetry in substrate recognition by viral proteases.

Main Methods:

  • Constructed mutant RSV PR by substituting amino acids based on human immunodeficiency virus (HIV-1) PR structure.
  • Combined individual substitutions into a single hybrid enzyme.
  • Assessed substrate cleavage and inhibitor sensitivity of the wild-type and mutant RSV PR.

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Main Results:

  • A hybrid RSV PR was created, exhibiting characteristics of HIV-1 PR.
  • The engineered protease cleaved HIV-1 polyprotein substrates not recognized by wild-type RSV PR.
  • The modified enzyme was fully inhibited by an HIV-1 PR-specific inhibitor, KNI-272.

Conclusions:

  • The major determinants of RSV and HIV-1 PR substrate specificity have been identified.
  • Viral protease homodimers function symmetrically in substrate selection.
  • Rational design of proteases with altered specificity is achievable.