Primary structure of a visual pigment in bullfrog green rods |
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Authors: | Hisatomi O Takahashi Y Taniguchi Y Tsukahara Y Tokunaga F |
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Institution: | Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan. |
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Abstract: | In frog retina there are special rod photoreceptor cells ('green rods') with physiological properties similar to those of typical vertebrate rods ('red rods'). A cDNA fragment encoding the putative green rod visual pigment was isolated from a retinal cDNA library of the bullfrog, Rana catesbeiana. Its deduced amino acid sequence has more than 65% identity with those of blue-sensitive cone pigments such as chicken blue and goldfish blue. Antisera raised against its C-terminal amino acid sequence recognized green rods. It is concluded that bullfrog green rods contain a visual pigment which is closely related to the blue-sensitive cone pigments of other non-mammalian vertebrates. |
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