Some properties of trypsin-like proteases extracted from the seaweedCodium fragile and their purification |
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| Authors: | K Kadokami N Yoshida K Mizusaki K Noda S Makisumi |
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| Institution: | (1) Kitakyushu Municipal Institute of Environmental Health Sciences, Tobata-ku, 804 Kitakyushu, Japan;(2) Department of Chemistry, Faculty of Science, Kyushu University 33, Higashi-ku, 812 Fukuoka, Japan;(3) Department of Home Economy, Kyushu Women's University, Yahatanishi-ku, 807 Kitakyushu, Japan;(4) Department of Human Life Science, Fukuoka Women's University, Higashi-ku, 813 Fukuoka, Japan |
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| Abstract: | Two enzymes were purified from the green algaCodium fragile, collected in 1988 at Fukuoka, Japan, by batch-wise ion-exchange extraction, affinity chromatography and ion-exchange high-performance liquid chromatography (HPLC) using Boc-Ala-Ala-Pro-Arg-pNA as a substrate. The molecular weights of the enzymes were estimated as 38 000 and 39 000, using gel filtration HPLC. The enzymes had the same optimal pH range of 7 to 9 for both activities, and an exclusively hydrolyzed peptide bond on the carboxyl-terminal side of theL-arginine of peptidep-nitroanilides. The ratios of the enzymatic activity for X-Arg-pNA to X-Lys-pNA were larger than 100. The enzymes exhibited 30 times higher activity toward Boc-Ala-Ala-Pro-Arg-pNA when compared with trypsin. The activities were strongly inhibited by diisopropyl phosphofluoridate (DFP), and partially inhibited by phenylmethylsulfonyl fluoride (PMSF), benzamidine, leupeptin and antipain. The isolated enzymes were presumed to be trypsin-like serine protease from their primary substrate specificities and inactivation behavior. |
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