Participation of GTP-binding Protein in the Photo-transduction of Paramecium bursaria.

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  • Shinozawa Takao
    Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University
  • Hashimoto Hiroyuki
    Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University
  • Fujita Jun
    Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University
  • Nakaoka Yasuo
    Department of Biophysical Engineering, Faculty of Engineering Science, Osaka University

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  • Participation of GTP-binding Protein in

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Analysis of the flow of light information in Paramecium, especially the participation of GTP-binding protein, was carried out. Injection of GDP-β-S into Paramecium cell abolished the light-induced inward current. The partially purified rhodopsin-like protein (RLP) that we obtained activated frog rod outer segments (ROS) GTPase. A GTP-binding protein, with Mw 57, 000, was detected by immunostaining with anti-rat Gα rabbit IgG. These results suggest that the light information flows from the light-captured RLP to the GTP-binding protein.

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