A Cysteine Endopeptidase ("Dionain") Is Involved in the Digestive Fluid of Dionaea muscipula (Venus's Fly-trap)

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  • TAKAHASHI Kenji
    School of Life Sciences, Tokyo University of Pharmacy and Life Sciences Department of Biology, School of Life Dentistry, The Nippon Dental University
  • SUZUKI Takehiro
    Biomolecular Characterization Team, RIKEN Advanced Science Institute
  • NISHII Wataru
    Systems and Structural Biology Center, RIKEN
  • KUBOTA Keiko
    School of Life Sciences, Tokyo University of Pharmacy and Life Sciences
  • SHIBATA Chiaki
    Department of Biology, School of Life Dentistry, The Nippon Dental University
  • ISOBE Toshiaki
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University
  • DOHMAE Naoshi
    Biomolecular Characterization Team, RIKEN Advanced Science Institute

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  • A Cysteine Endopeptidase (“Dionain”) Is Involved in the Digestive Fluid of<i>Dionaea muscipula</i>(Venus’s Fly-trap)

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Abstract

The carnivorous plant Dionaea muscipula (Venus’s flytrap) secretes proteinases into the digestive fluid to digest prey proteins. In this study, we obtained evidence that the digestive fluid contains a cysteine endopeptidase, presumably belonging to the papain family, through inhibitor studies and partial amino acid sequencing of the major SDS–PAGE band protein. The name “dionain” is proposed for the enzyme.

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