Low-temperature photoreaction cycle of phoborhodopsin (sensory rhodopsin II) from Halobacterium salinarium

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概要

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• There are four types of retinal proteins in the membrane of Halobacterium salinarum.Bacteriorhodopsin (BR) and halorhodopsin (HR) convert light energy into electrostatic gradients that can be used by the cell as an energy source to produce ATP. Sensory rhodopsin I (SR I) and phoborhodopsin (pR) enable the cells to migrate toward an environment optimal for light energyharvesting while avoiding potentially damaging shorter wavelength light. In the present work, low temperature photoreaction cycle of pR expressed in E. coli was studied. Comparing to the previousresults, the new findings in the present work are: (i) The K-like intermediate was found to be a mixture of two photoproducts. (ii) Formation of an L-like intermediate (P482) was observed. (iii) Upon light irradiation, formation of a long lived shorter wavelength photoproduct (P370) wasobserved at 20 ℃.

著者

• Dai Gang

  Division Of Science For Composite Functions Muroran Institute Of Technology Muroran Japan 'coll

• Dai Gang

  Division Of Science For Composite Functions Muroran Institute Of Technology Muroran Japan 'coll

関連論文

• Low-temperature photoreaction cycle of phoborhodopsin (sensory rhodopsin II) from Halobacterium salinarium
• 3P274 A Long-lived photoproduct, P370, formed from salinarum phoborhodopsin at room temperature(Photobiology: Vision & Photoreception,The 48th Annual Meeting of the Biophysical Society of Japan)
• 1P-261 高度好塩菌フォボロドプシン(センサリーロドプシンII)の光反応サイクル(光生物・視覚,光受容(1),第46回日本生物物理学会年会)
• 3P-207 ファラオニスフォボロドプシンの光反応サイクルに対するpHの影響(光生物-視覚・光受容,第47回日本生物物理学会年会)

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