Identification and characterisation of acidic and novel basic forms of actinidin, the highly abundant cysteine protease from kiwifruit

Functional Plant Biology : FPB
Niels J NieuwenhuizenRoss G Atkinson

Abstract

Actinidin is a cysteine protease found in Actinidia Lindl. (kiwifruit) species that affects the nutraceutical properties, processing characteristics and allergenicity of the fruit. Given the increased consumption of kiwifruit worldwide and the release of new varieties from different Actinidia species, the expression of actinidin mRNA and protein in a range of kiwifruit tissues was examined. Ten different actinidin mRNAs were identified encoding mature proteins of similar molecular weight (~24 kDa), but with predicted pIs ranging from acidic (pI 3.9) to basic (pI 9.3). In A. deliciosa 'Hayward' (green-fleshed kiwifruit) and A. chinensis 'Hort16A' and EM4 (gold-fleshed kiwifruit), actinidin mRNAs for acidic and basic proteins were expressed at comparable levels throughout ripening. Actinidin mRNA expression was highest in fruit at harvest, expression decreased as fruit ripened and was much lower in the core compared with outer pericarp tissue. Two-dimensional gel electrophoresis, combined with western analysis and liquid chromatography mass spectrometry (LC-MS) identified low levels of a novel basic actinidin protein in ripe A. deliciosa and A. chinensis fruit. Extremely high levels of an acidic actinidin protein were detected in...Continue Reading

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Jul 22, 2014·Journal of Biomedical Materials Research. Part a·Jennifer N RodriguezDuncan J Maitland
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