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The effect of recombinant caspase 3 on myofibrillar proteins in porcine skeletal muscle

Published online by Cambridge University Press:  01 August 2008

C. M. Kemp  and
T. Parr
C. M. Kemp
Affiliation:
Division of Nutritional Sciences, School of Biosciences, Sutton Bonington Campus, The University of Nottingham, Leicestershire, LE12 5RD, UK
T. Parr*
Affiliation:
Division of Nutritional Sciences, School of Biosciences, Sutton Bonington Campus, The University of Nottingham, Leicestershire, LE12 5RD, UK
*
E-mail: [email protected]
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Abstract

The objective of this study was to investigate the potential role of the caspase protease family in meat tenderisation by examining if caspase 3 was capable of causing myofibril protein degradation. Full-length human recombinant caspase 3 (rC3) was expressed in Escherichiacoli and purified. The rC3 was active in the presence of myofibrils isolated from porcine longissimus dorsi muscle (LD) and retained activity in a buffer system closely mimicking post mortem conditions. The effect of increasing concentrations of rC3, incubation temperature, as well as incubation time on the degradation of isolated myofibril proteins were all investigated in this study. Myofibril protein degradation was determined by SDS-PAGE and Western blotting. There was a visible increase in myofibril degradation with a decrease in proteins identified as desmin and troponin I and the detection of protein degradation products at approximately 32, 28 and 18 kDa with increasing concentrations of rC3. These degradation products were analysed using MALDI-TOF mass spectrometry and identified to occur from the proteolysis of actin, troponin T and myosin light chain, respectively. The production of these degradation products was not inhibited by 5 mM EDTA or semi-purified calpastatin but was inhibited by the caspase-specific inhibitor Ac-DEVD-CHO. The temperature at which isolated myofibrils were incubated with rC3 was also found to affect degradation, with increasing incubation temperatures causing increased desmin degradation and cleavage of pro-caspase 3 into its active isoform. Incubation of isolated myofibrils at 4°C for 5 days with rC3 resulted in the visible degradation of a number of myofibril proteins including desmin and troponin I. This study has shown that rC3 is capable of causing myofibril degradation, hydrolysing myofibril proteins under conditions that are similar to those found in muscle in the post mortem conditioning period.

Keywords

caspasemyofibrilsproteolysistenderization
Type
Full Paper
Information
animal , Volume 2 , Issue 8 , August 2008 , pp. 1254 - 1264
Copyright
Copyright © The Animal Consortium 2008

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