PHOTOREACTIONS OF THE PHOTOINTERMEDIATES OF BACTERIORHODOPSIN

PHOTOREACTIONS OF THE PHOTOINTERMEDIATES OF BACTERIORHODOPSIN
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细菌视紫红质光中间体的光反应

DOI:
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发表时间:
1995
期刊:
影响因子:
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通讯作者:
S. Balashov
S. Balashov
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作者:
S. Balashov

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综述了细菌视紫红质(bR)光化学循环中间产物的光化学反应。这些反应构成了光化学控制的循环,并提供了一个独立的途径,在紫膜的光能转导机制的调查。光量子被K、L或M中间体吸收后,会将它们转换回bR。这些转换中断了光循环,使得在吸收第二量子之后没有质子转移发生。蓝光对M中间体的作用引起发色团的结构变化,结果是席夫碱从Asp-85,而不是从Asp-96,如在M的通常热转变中,被还原。L、M、N和O中间体的光反应导致新的光产物的形成。中间体的光转化的研究可以作为一个额外的信息来源,在bR的光过程的性质:他们揭示了几个构象的K和bR在90 K,不同的M状态,两个N中间体,并提供了直接的证据,从N到M的热逆反应的存在。研究J、K、L、M、N和O中间体的光反应是阐明这些态的结构和作用的一种很有前途的方法。bR及其光中间体的可逆光转换为bR在光学信息配准中的潜在应用提供了基础。
The photochemical reactions of the intermediates of the photochemical cycle of bacteriorhodopsin (bR) are reviewed. These reactions constitute photochemical control of the cycle and provide an independent approach for the investigation of the mechanism of light energy transduction in the purple membrane. The absorption of a light quantum by the K, L, or M intermediates converts them back to bR. These transformations interrupt the photocycle so that no proton transfer occurs after absorption of the second quantum. The action of blue light on the M intermediate causes structural changes of the chromophore, as a result of which the Schiff base is reprotonated from Asp-85, not from Asp-96 as in the usual thermal transition of M. The photoreactions of the L, M, N, and O intermediates lead to the formation of new photoproducts. Studies of the photoconversion of the intermediates can serve as an additional source of information on the nature of photoprocesses in bR: they reveal several conformers of K and bR at 90 K, different M states, two N intermediates, and provide direct evidence for the existence of a thermal back reaction from N to M. The study of the photoreactions of the J, K, L, M, N, and O intermediates is a promising method for elucidating the structures and roles of these states. Reversible photoconversions of bR and its photointermediates provide a basis for potential applications of bR in optical registration of information.
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发表时间: 1989-12-01
影响因子: 11.1
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感觉视紫红质 I 的视网膜结合袋中的空间限制。
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