低温におけるロドプシン照射時の電導度変化

概要

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Recently Hara (1958) found that rhodopsin solutions underwent a conductance change on illumination as long as they preserved their photosesitivities. The present work was carried out with a view of examining temperature dependence of the conductance change developed by cattle rhodopsin under illumination with 12,000 lux. 1. The conductance of acid solution decreases remarkably on illumination but begins to increase after about 15 seconds (Fig. 1), whereas that of alkaline solution only continues to decrease with the lapse of time (Fig. 3). 2. The whole pattern of the conductance change described above is not affected by low temperature near 0℃. Such temperature, however, not only shows a remarkable effect of diminishing the magnitude of the change-especially, of the conductance decrease (Table 1)-but also tends to delay the beginning of the change (Fig. 2). 3. Although the conductance decrease of illuminated acid solution gradually disappears with lowering of temperature (Table 2), it can be still recognized even at temperature as low as -12℃. 4. Since illumination at about 0℃ is regarded as responsible for converting rhodopsin to an intermediate, not yet producing indicator yellow (Hara, 1960), the conductance change must be ascribed to a sequence of weak denaturations of rhodopsin relating to the conversion of rhodopsin to the intermediate.
社団法人日本動物学会の論文
1960-08-15