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학술저널
저자정보
Sugiyama, Yuka (Department of Physiology and Pharmacology, Tohoku University Graduate School of Medicine) Wang, Hongxia (Tohoku University Basic and Translational Research Center for Global Brain Science) Hikima, Takuya (Tohoku University Basic and Translational Research Center for Global Brain Science) Sato, Minami (Faculty of Pharmaceutical Sciences, Toho University) Kuroda, Jun (Faculty of Pharmaceutical Sciences, Toho University) Takahashi, Tetsuo (Faculty of Pharmaceutical Sciences, Toho University) Ishizuka, Toru (Department of Developmental Biology and Neuroscience,Tohoku University Graduate School of Life Sciences) Yawo, Hiromu (Department of Physiology and Pharmacology, Tohoku University Graduate School of Medicine)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제3호
발행연도
2009.1
수록면
328 - 336 (9page)

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Channelrhodopsin-2 (ChR2), one of the algal light-gated cation channel rhodopsins, contains five peculiar glutamic acid residues in the N-terminal region corresponding to the second to third transmembrane helices. Here we made systematic mutations of these polar amino acid residues of ChR2 into nonpolar alanine, and evaluated their photocurrent properties. Amongst them, the photocurrent generated by the E97A mutation, ChR2(E97A), was much smaller than expected from its expression. The ChR2(E97A) photocurrent was similar to wild-type ChR2 in the kinetic profiles, the reversal potential and the dependency to the light power density. Our results suggest that the residue E97 is one of the molecular determinants involved in the ion flux regulation.

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