Abstract
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.
