Isolation of polyphenol oxidase genes from Portulaca oleracea and evaluation of their ability to metabolize endocrine-disrupting chemicals

DOI Web Site 被引用文献1件 参考文献22件
  • Kaneda Hirokazu
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Matsui Takeshi
    Graduate School of Biological Sciences, Nara Institute of Science and Technology Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Tomiyasu Ryosuke
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Kuroda Yukako
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Higashimoto Yuka
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Oda Tomoka
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Miyasaka Hitoshi
    Environmental Research Center, The Kansai Electric Power Co., Inc. Environmental Research Center, The Kansai Electric Power Co., Inc.
  • Okuhata Hiroshi
    Environmental Research Center, The Kansai Electric Power Co., Inc. Environmental Research Center, The Kansai Electric Power Co., Inc.
  • Tanaka Satoshi
    Environmental Research Center, The Kansai Electric Power Co., Inc. Environmental Research Center, The Kansai Electric Power Co., Inc.
  • Harada Kazuo
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Matsuura Hideyuki
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University
  • Nakayama Hideki
    Graduate School of Fisheries Science and Environmental Studies, Nagasaki University Graduate School of Fisheries Science and Environmental Studies, Nagasaki University
  • Kato Ko
    Graduate School of Biological Sciences, Nara Institute of Science and Technology Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Hirata Kazumasa
    Graduate School of Pharmaceutical Sciences, Osaka University Graduate School of Pharmaceutical Sciences, Osaka University

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  • Isolation of polyphenol oxidase genes from <i>Portulaca oleracea</i> and evaluation of their ability to metabolize endocrine-disrupting chemicals

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Portulaca (Portulaca oleracea cv.), a garden plant, efficiently removes endocrine-disrupting chemicals (EDCs) including bisphenol A (BPA) from hydroponic solution. We hypothesized that polyphenol oxidase (PPO) was involved in the initial steps of detoxifying EDCs in portulaca roots. In order to elucidate the molecular basis of portulaca’s ability to metabolize EDCs, we first isolated five PPO genes (PoPPO1–5) that were expressed mainly in portulaca roots. Among these genes, PoPPO2, PoPPO4 and PoPPO5 were introduced into cultured tobacco cells and expressed as active forms. We found that crude extracts from the cells expressing PoPPO2, PoPPO5, and to a lesser extent PoPPO4, could metabolize BPA. In addition, we found that the BPA metabolites from crude extracts of cells expressing PoPPO2, PoPPO4 and PoPPO5 were identical to those of portulaca. Moreover, PoPPO2 and PoPPO5 also caused hydroxylation of octylphenol, nonylphenol and 17β-estradiol. Therefore, these results strongly suggest that PoPPOs significantly contribute to the superior ability of portulaca to metabolize EDCs.

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