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Updated: May 17, 2026

Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods
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Published on: December 21, 2019

Substrate specificity of Tulane virus protease.

Chao Wei1, Jarek Meller, Xi Jiang

  • 1Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.

Virology
|November 13, 2012
PubMed
Summary

Tulane virus protease exhibits substrate specificities similar to Norwalk virus protease. This suggests Tulane virus can serve as a model for developing human norovirus protease inhibitors.

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Area of Science:

  • Virology
  • Molecular Biology

Background:

  • Tulane virus (TV) is a calicivirus found in rhesus monkeys.
  • Understanding TV protease function is crucial for developing antiviral strategies.

Purpose of the Study:

  • To characterize the substrate specificity of Tulane virus protease.
  • To compare TV protease activity with Norwalk virus protease.

Main Methods:

  • Used recombinant proteases and polyprotein fragments of TV.
  • Analyzed cleavage sites within the TV polyprotein.
  • Assessed enzymatic activities using synthetic fluorogenic peptide substrates.

Main Results:

  • Identified TV protease cleavage sites between helicase/3A-like protein, 3A-like protein/Vpg, Vpg/protease, and protease/RdRp.
  • Observed partial cross-reactivity between TV and Norwalk virus proteases on reciprocal substrates.

Conclusions:

  • Tulane virus protease shares substrate specificities with Norwalk virus protease.
  • Cultivable Tulane virus can be a valuable model for evaluating human norovirus protease inhibitors in vivo.

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