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Related Experiment Videos

Sequential autolytic processing activates the zymogen of Arg-gingipain.

Jowita Mikolajczyk1, Kelly M Boatright, Henning R Stennicke

  • 1Burnham Institute, La Jolla, California 92037, USA.

The Journal of Biological Chemistry
|January 21, 2003
PubMed
Summary

Most proteases are inactive precursors. Arg-gingipain-B, a caspase relative, shows substantial zymogen activity, requiring sequential processing for full activation, unlike typical latency mechanisms.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Proteases are synthesized as inactive precursors (zymogens) to prevent cellular damage.
  • Latency mechanisms vary but are generally conserved within protease families.
  • Caspases utilize a unique loop-transition mechanism for activation, suggesting conserved mechanisms in relatives.

Purpose of the Study:

  • To investigate the activation mechanism of Arg-gingipain-B, an Arg-specific caspase relative from Porphyromonas gingivalis.
  • To determine the role of N- and C-terminal extensions in the latency and activation of Arg-gingipain-B.
  • To elucidate the sequential processing steps required for full Arg-gingipain-B activity.

Main Methods:

  • Expression of full-length Arg-gingipain-B precursor.

Related Experiment Videos

  • Biochemical assays to assess protease activity and latency.
  • Affinity probe analysis to monitor incremental activity enhancements during processing.

    • Main Results:

    • Arg-gingipain-B precursor exhibits low latency with substantial zymogen activity.
    • N- and C-terminal extensions contribute to the limited latency.
    • Three sequential autolytic processing steps at the N and C termini are necessary for full activity.
    • The N-propeptide may function as an intramolecular chaperone, not solely an inhibitor.
    • Each activation step is dependent on the preceding one, with stepwise increases in activity.

    Conclusions:

    • Arg-gingipain-B possesses a unique activation mechanism distinct from typical caspase latency.
    • The sequential processing pathway highlights a stepwise acquisition of protease activity.
    • The N-propeptide's role as a potential intramolecular chaperone warrants further investigation in protease regulation.