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Related Experiment Videos

Human cathepsin V functional expression, tissue distribution, electrostatic surface potential, enzymatic

D Brömme1, Z Li, M Barnes

  • 1Department of Human Genetics, Mount Sinai School of Medicine, CUNY, New York 10029, USA. brommd01@doc.mssm.edu

Biochemistry
|February 25, 1999
PubMed
Summary

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Cathepsin V, a human cysteine protease, shows unique substrate specificity and pH stability, differing from Cathepsin L. Its distinct molecular surface electrostatics may explain these differences and its evolutionary origin.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protease Research

Background:

  • Cathepsin V is a human cysteine protease found in the thymus and testes.
  • Understanding its properties is crucial for distinguishing it from related proteases like Cathepsin L and S.

Purpose of the Study:

  • To characterize the physicokinetic properties of recombinant Cathepsin V.
  • To compare its substrate specificity, collagenolytic activity, and pH stability with Cathepsins L and S.
  • To investigate the structural basis for its unique characteristics through homology modeling.

Main Methods:

  • Expression of recombinant Cathepsin V in Pichia pastoris.
  • Determination of autocatalytic activation pH and inhibition by protease inhibitors.
  • Analysis of S2P2 subsite specificity using various substrates.

Related Experiment Videos

  • Assessment of collagenolytic activity and pH stability.
  • Homology modeling to analyze molecular surface electrostatic potentials.

    • Main Results:

    • Recombinant Cathepsin V is autocatalytically activated at acidic pH and inhibited by cysteine protease inhibitors.
    • Its S2P2 subsite specificity is intermediate between Cathepsins S and L, accepting diverse hydrophobic residues.
    • Cathepsin V exhibits weak collagenolytic activity, similar to Cathepsin S.
    • It shows greater stability at mildly acidic and neutral pH than Cathepsin L but less than Cathepsin S.
    • Homology modeling revealed distinct electrostatic potentials on Cathepsin V's surface compared to Cathepsin L, resembling mouse Cathepsin L.

    Conclusions:

    • Cathepsin V possesses unique substrate selectivity and pH stability profiles attributed to its molecular surface electrostatics.
    • These properties suggest an evolutionary divergence from an ancestral Cathepsin L-like precursor via gene duplication, supported by its chromosomal location near Cathepsin L.