1985 Fiscal Year Final Research Report Summary
Characterization and Physiological Functions of New Retinal Protein Found in Cell Membrane of Halobacterium halobium
| Project/Area Number |
58420053
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
生物物性学
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
1983 – 1985
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| Keywords | Halobacterium halobium / Sensory rhodopsin / retinal protein / 閃光光分解 / レチナール蛋白 |
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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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