| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥19,500,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1984: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1983: ¥12,500,000 (Direct Cost: ¥12,500,000)
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| Research Abstract |
A new retinal binding chromoprotein in addition to bacteriorhodopsin (bR) and halorhodopsin (hR) was found recently in the cell membrane of Halobacterium halobium and was named as the third rhodopsin. Like bR and hR, the third rhodopsin shows photoreaction cycling upon illumination, but the decay time of its photointermediate is found about 650 ms which is two order of magnitude slower than that of the other two pigments. Behaviral studies of the H. halobium have shown that the third pigment acts as photoreceptors for both positive and negative phototactic systems. Thus the third rhodopsin has been renamed as "Sensory Rhodopsin" and abbreviated as sR. Also, another photorepellent system is found in the course of the study, which is mediated by a different (the fourth) photoreactive retinal pigment.
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