Enzymatic properties, substrate specificities and pH-activity profiles of two kiwifruit proteases
1997
Sugiyama, S. (Kyoto Prefectural Univ. (Japan)) | Ohtsuki, K. | Sato, K. | Kawabata, M.
Kiwifruit (Actinidia chinensis) contains abundant protease, actinidin, and two possible opponents which were named A1 and A2. However, a comparison of the two components has not been thoroughly conducted. We have previously shown the presence of six proteases named KP1, KP2, KP3, KP4, KP5 and KP6 in kiwifruit, and that each purifited kiwifruit protease was chromatographically pure. It was also indicated that the two representative components, KP4 and KP6, must be A1 and A2. To establish whether or not the two proteases, KP4 and KP6, have the same specificity in proteolytic activity, their enzymatic properties were compared. Between the two proteases, differences in substrate specificity against several protein-substrates (casein, gelatin, collagen, ovalbumin and bovine serum albumin) were not observed by digestion-product analysis with sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The kinetic parameters of KP4 against N-alpha-carbobenzoxyl-lysine p-nitrophenyl esters were different from those of KP6. The pH-activity profiles of KP4 and KP6 against S-3-trimethylaminopropyl-lysozyme, a wide-pH range soluble substrate, and N-alpha-carbobenzoxyl-lysine p-nitrophenyl esters were different
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Agriculture, Forestry and Fisheries Research Information Technology Center