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Neutral calcium-activated proteases from European sea bass ( Dicentrarchus labrax L.) muscle: polymorphism and biochemical studies
Calcium-dependent proteinases or calpains were studied in fish muscle. Hydrophobic chromatography, followed by anion-exchange chromatography of the soluble fraction of sea bass white muscle proteins, resulted in three peaks of calcium-dependent protease activity at neutral pH (A, B and C). They are...
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Published in: | Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology 2000, Vol.125 (1), p.83-95 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Calcium-dependent proteinases or calpains were studied in fish muscle. Hydrophobic chromatography, followed by anion-exchange chromatography of the soluble fraction of sea bass white muscle proteins, resulted in three peaks of calcium-dependent protease activity at neutral pH (A, B and C). They are all neutral cysteine calcium-activated proteinases and can, therefore, be classified as calpain-like enzymes. From the Ca
2+ concentration required for activity, A is a μ-calpain, and B and C are m-calpains. They share many properties with calpains from other vertebrate cells but differ in native mass, subunit composition, and the unusual numbers in which they are present. Their specific pattern of expression throughout the year could be of great importance to the resulting rate and extent of degradation of fish flesh after death. |
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ISSN: | 1096-4959 0305-0491 1879-1107 |
DOI: | 10.1016/S0305-0491(99)00157-1 |