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Related Experiment Videos

Active human cytomegalovirus protease is a dimer

P L Darke1, J L Cole, L Waxman

  • 1Department of Antiviral Research, Merck Research Laboratories, West Point, Pennsylvania 19486, USA.

The Journal of Biological Chemistry
|March 29, 1996
PubMed
Summary

The human cytomegalovirus (hCMV) protease functions as a dimer, not a monomer. Dimerization, crucial for its catalytic activity in peptide hydrolysis, is influenced by enzyme concentration and glycerol.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Virology

Background:

  • Human cytomegalovirus (hCMV) protease plays a critical role in viral replication.
  • Understanding the quaternary state of viral proteases is essential for drug development.
  • The oligomeric state of proteases can significantly impact their enzymatic activity.

Purpose of the Study:

  • To investigate the quaternary state of the hCMV protease.
  • To determine the relationship between the protease's oligomeric state and its catalytic activity.
  • To elucidate the kinetic model governing hCMV protease function.

Main Methods:

  • Steady-state kinetics
  • Size exclusion chromatography
  • Velocity sedimentation assays

Related Experiment Videos

  • Enzyme activity measurements

    • Main Results:

    • The hCMV protease exists in a monomer-dimer equilibrium.
    • Dimerization is promoted by increased enzyme concentration and glycerol presence.
    • The dimeric form of the protease was identified as the catalytically active species.

    Conclusions:

    • The active form of the hCMV protease is its dimeric state.
    • Kinetic models confirm that only the dimer exhibits catalytic activity.
    • Dissociation constants were determined under varying glycerol concentrations, indicating stabilization of the dimer.