Several properties of the partially purified proteinase inhibitor in eggplant exocarp.

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  • KANAMORI Masao
    Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto Prefectural Univerity
  • IBUKI Fumio
    Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto Prefectural Univerity
  • YAMADA Masaaki
    Research Laboratories, The Green Cross Corp.
  • TASHIRO Misao
    Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto Prefectural Univerity
  • MIYOSHI Masamitsu
    Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto Prefectural Univerity

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  • Several properties of the partially purtially purified proteinase inhibitor in eggplant exocarp
  • Several properties of the partially pur

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A proteinase inhibitor was isolated and partially purified from the exocarp of eggplant, Solanum melongena L., by means of acetate buffer extraction, heat treatment, salting-out and column chromatography on DEAF-cellulose. This preparation showed inhibitory activities on various proteinases; trypsin [EC 3. 4. 4, 4] and Pronase were strongly inhibited while α-chymotrypsin [EC 3. 4. 4. 5] and Nagarse were weakly inhibited. The inhibitor was a protein substance, and, therefore, it was gradually inactivated by the long-time incubation with Pronase. The inhibition mode was non-competitive on trypsin and competitive on Pronase on the basis of Lineweaver-Burk plots. The investigations on the inhibition behavior in the co-existence of two kinds of proteinases suggested that the inhibitor was not of multi-headed type.

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