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In a search for aspartic proteinase inhibitors (APIs) in kiwifruit seeds, we observed pepsin inhibitory activity (PIA) in an abundant globulin fraction extracted in high salt buffer with a Mr of ∼148kDa by gel-filtration. On a SDS-polyacrylamide gel, a major protein band of 54kDa was observed under non-reducing conditions. This band was largely replaced by two subunits of Mr 33.5 and 20kDa under reducing...
Kiwifruit cysteine proteinase inhibitors (KCPIs) were purified from the cortex and seeds of kiwifruit after inactivation of the abundant cortex cysteine proteinase actinidain. One major (KCPI1) and four minor cystatins were identified from Actinidia deliciosa ripe mature kiwifruit cortex as well as a seed KCPI from A. chinensis. The predominant cortex cystatin, KCPI1, inhibited clan CA, family C1...
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