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Related Experiment Videos

Multi-step processing of procathepsin L in vitro

K Ishidoh1, E Kominami

  • 1Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan.

FEBS Letters
|October 3, 1994
PubMed
Summary

Procathepsin L activation to cathepsin L is temperature-dependent. Optimal 37°C conditions yield mature cathepsin L, while lower temperatures result in partially processed forms with reduced activity.

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Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • Procathepsin L is a zymogen requiring proteolytic processing for activation.
  • Cathepsin L is a key cysteine protease involved in various biological processes.

Purpose of the Study:

  • To investigate the proteolytic conversion of procathepsin L to mature cathepsin L.
  • To elucidate the role of temperature and surface charge in enzyme activation.

Main Methods:

  • Incubation of purified procathepsin L with dextran sulfate at different temperatures (37°C vs. ice).
  • Analysis of enzyme activity and molecular weight.
  • Amino-terminal amino acid sequencing.

Main Results:

  • Maximal activation and complete conversion to a 30 kDa mature form occurred at 37°C.
  • Incubation on ice resulted in partial proteolysis to a 31 kDa form with minimal activity increase.
  • Amino-terminal sequencing revealed distinct processing pathways at different temperatures.

Conclusions:

  • Temperature significantly influences the activation and processing of procathepsin L.
  • The carboxyterminal residues (Glu-Pro-Leu-Met) in the propeptide may regulate cathepsin L activation.

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