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자료유형
학술저널
저자정보
Iwasa, Tatsuo (Department of Material Science and Engineering, Muroran Institute of Technology,) Shimazaki, Yumiko (Ushimado Marine Laboratory, Faculty of Science, Okayama University) Yamamoto, Masamichi (Ushimado Marine Laboratory, Faculty of Science, Okayama University) Ohtsu, Kohzoh (0ki Marine Biological Station, Department of Biological Science, Shimane University)
저널정보
한국광과학회 Journal of photoscience : an international journal officail organ of the korean society of photoscience Journal of photoscience : an international journal officail organ of the korean society of photoscience 제9권 제2호
발행연도
2002.1
수록면
278 - 280 (3page)

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We have cloned a hydromedusan opsin cDNA and showed that the deduced amino acid sequence of the cytoplasmic loop between helices 5 and 6 (loop 5-6) was clearly different from that reported so far. The amino acid sequence of the loop 5-6 is important on determination of the specificity for the coupled G- protein. To clarify which class of G-protein mediates the phototransduction system in the ocellus of the hydromedusan, we investigated G-proteins expressed in the ocellus. By PCR against the cDNA of the ocellus with primers designed according to the conserved amino acid sequence in G-protein a subunit, we obtained three kinds of cDNA fragments. Based on the sequence similarities, ttwo of them (JGI and JG3) were classified as $G_{i}$ and $G_{q}$, respectively. The other one (JG2) was a new subtype within $G_{*}$ class. Electron microscopic immunocytochemistry with the antiserum against the C-terminal sequence of $G_{q}$ or $G_{t}$ revealed the presence. of the both classes in the ocellus. The similarity of the C-terminal sequence of the JG2 with that of bovine $G_{t}$ suggests that the anti- $G_{t}$ antiserum would bind to JG2. These results suggest the possibility that the hydromedusan rhodopsin decides the specificity for the coupled G-protein by the other domain than the loop 5-6.oop 5-6.5-6.

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