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Kinetic stability as a mechanism for protease longevity.

E L Cunningham1, S S Jaswal, J L Sohl

  • 1Graduate Group in Biophysics, Howard Hughes Medical Institute, Department of Biochemistry, University of California, San Francisco, CA 94143-0448, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 29, 1999
PubMed
Summary

Alpha-lytic protease (alphaLP) achieves stability through kinetics, not thermodynamics, using a pro region to facilitate folding. This results in a metastable, long-lived protease resistant to degradation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Extracellular serine proteases require stability for function.
  • Traditional stability is thermodynamically driven.
  • Alpha-lytic protease (alphaLP) exhibits unusual stability.

Purpose of the Study:

  • To elucidate the novel stability mechanism of alphaLP.
  • To understand the role of the pro region in alphaLP folding and stability.
  • To investigate the kinetic stability of alphaLP compared to other proteases.

Main Methods:

  • Structural analysis and mutational studies of alphaLP.
  • Investigating the interaction between the pro region and the alphaLP C-terminal domain.
  • Assessing the proteolytic degradation resistance of alphaLP and homologous proteases.

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Main Results:

  • AlphaLP stability is kinetically controlled, not thermodynamically.
  • The pro region stabilizes the folding transition state and native state of alphaLP.
  • AlphaLP exhibits metastability due to a large unfolding barrier and rigidity, enhancing resistance to degradation.
  • AlphaLP demonstrates superior survival under proteolytic conditions compared to mammalian proteases.

Conclusions:

  • AlphaLP employs a unique kinetic stability mechanism for longevity.
  • The pro region is crucial for achieving this metastable state.
  • Kinetic stability may be a conserved strategy in bacterial and eukaryotic proteases facing harsh environments.