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Calcium and calpastatin delay proteolysis early during beef maturation
J S Bodmer1, M Beline2, C N Yen3
1Department of Animal and Dairy Sciences, Mississippi State University, Mississippi State, MS 39762, USA.
Meat Science
|March 22, 2026
Summary
Early beef maturation involves calpain-1 activity, influenced by calcium and calpastatin. Muscle type and calcium availability impact calpain-1
Area of Science:
- Meat Science
- Biochemistry
- Proteolysis
Background:
- Calpain-mediated proteolysis is crucial for early beef maturation.
- Understanding calpain-1 activity and its inhibitors is key to meat tenderization.
Purpose of the Study:
- To investigate calpain-1 autolysis and calpastatin abundance during early beef aging.
- To determine the influence of calcium on calpain-1 activity and desmin degradation in vitro.
- To compare proteolysis between Longissimus thoracis et lorum (LTL) and Extensor carpi radialis (ER) muscles.
Main Methods:
- In vitro proteolytic approach using powdered muscle samples.
- Analysis of calpain-1 autolysis, calpastatin levels, and desmin degradation over time.
- Addition of calcium to assess its impact on proteolysis in early postmortem LTL muscle.
Main Results:
- Calpain-1 autolysis and desmin degradation were influenced by postmortem age and calcium availability.
- Calpastatin levels decreased over time, with higher retention in ER muscle compared to LTL.
- Early postmortem LTL muscle showed increased calpain-1 autolysis and desmin degradation with added calcium.
Conclusions:
- Calcium availability and calpastatin abundance are key regulators of calpain-1 activity in early beef maturation.
- These factors limit calpain-1 activity within the first 24 hours postmortem.
- Proteolytic activity is muscle-dependent, with ER showing minimal changes compared to LTL.
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