Effect of high pressure on the calpain-calpastatin system in fish muscle

Type Article
Date 2007-08
Language English
Author(s) Cheret Romuald2, Delbarre Ladrat ChristineORCID2, Verrez-Bagnis VeroniqueORCID2, De Lamballerie Marie1
Affiliation(s) 1 : CNRS, Ecole Natl Ingn Tech, Ind Agr & Alimentaries, UMR 6144,GEnie Procedes Enironm & Agr, F-44322 Nantes 3, France.
2 : IFREMER, F-44311 Nantes, France.
Source Journal of Food Science (0022-1147) (Blackwell science), 2007-08 , Vol. 72 , N. 6 , P. C313-C316
DOI 10.1111/j.1750-3841.2007.00410.x
WOS© Times Cited 10
Keyword(s) Postmortem denaturation, High pressure, Fish, Calpain system
Abstract Calpains (calcium-activated neutral proteases) of sea bass (Dicentrarchus labrax L.) muscle may participate in the degradation of muscle tissue during postmortem storage. These enzymes are regulated by calpastatin, their endogenous specific inhibitor. The objective of this study was to evaluate the changes encountered by the calpain system during the postmortem storage of fish muscle after high-pressure treatment. From 100 MPa, high-pressure treatment of purified calpains results in a loss of their activity as well as in the dissociation of the heterodimeric form. In muscle, the high-pressure processing decreases the initial activity of calpain. This loss in activity may be due to an inactivation by a change of structure. Initial calpastatin activity is not modified by the high-pressure treatment, but it decreases during the storage from the beginning for a treatment at 300 MPa after which calpastatin is stable during 2 d. Therefore, this study also suggests that high-pressure treatment could be a useful way to improve fish flesh quality.

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