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Related Experiment Videos

A continuous method for measuring calpain activity

S T Jiang1, J H Wang, T Chang

  • 1Department of Marine Food Science, National Taiwan Ocean University, Keelung, Taiwan, Republic of China. sjiang@ind.ntou.edu.tw

Analytical Biochemistry
|January 15, 1997
PubMed
Summary
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Scientific reports·2022

A simplified caseinolysis assay using calpains was developed. This method measures turbidity, offering continuous monitoring without separating hydrolysates, making calpain activity assessment more efficient.

Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • Calpains are calcium-dependent proteases involved in various cellular processes.
  • Accurate and efficient assays for calpain activity are crucial for research.

Purpose of the Study:

  • To develop a simplified and continuously monitored assay for measuring caseinolysis by calpains.
  • To establish a novel method that avoids substrate-hydrolysate separation.

Main Methods:

  • Incubation of calpain with casein.
  • Direct measurement of absorbance at 500 nm to quantify turbidity.
  • Calculation of calpain activity based on maximum reaction velocity (delta A500/min) at 25°C.

Main Results:

  • A simplified caseinolysis assay was successfully developed.

Related Experiment Videos

  • The assay relies on measuring the turbidity of the reaction mixture.
  • Continuous monitoring is possible in the visible wavelength range.

    • Conclusions:

    • The novel assay provides a simplified and efficient method for assessing calpain activity.
    • This method eliminates the need for separating casein hydrolysates from the substrate.
    • The assay is suitable for continuous monitoring and offers a practical approach for calpain research.