ロドプシン照射時の電導度変化経過の解析

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As reported previously (Hara, 1957-58 ; Hara and Hara, 1960), solutions of cattle rhodopsin on illumination reveal a conductance change depending on pH, as long as they preserve their photosensitivity. In order to analyze the conductance change, further studies have been made by means of flash-photolysis techniques. On exposure of the neutral solution of rhodopsin to a flash of light, the conductance decreases rapidly at first, increases for a short time and later decreases again very slowly. This suggests that the whole pattern of the conductace change consists of three different elementary processes, i.e. processes I (initial decrease), II (increase) and III (slow decrease). Processes I, II and III can be separated almost perfectly on flash illumination of acid, slightly acid and alkaline rhodopsins respectively. Each of the processes is a thermal reaction, and the half-time of each at ordinary temperature is estimated to be about 15 milliseconds, 2 seconds and several minutes or more in processes I, II and III, respectively. All the processes of the conductance change may be associated with certain conformational changes induced in the protein moiety of the rhodopsin molecule by photoexcitation of retinene. However, process III is most severely affected by the aging of rhodopsin, while the other two are affected only slightly. Processes I and II which result promptly after illumination are perhaps closely related to the initial stage of the excitation of rod cells.
社団法人日本動物学会の論文
1964-01-15

ロドプシン照射時の電導度変化経過の解析

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