Xanthorhodopsin: Proton pump with a carotenoid antenna

被引:34
作者
Balashov, S. P. [1 ]
Lanyi, J. K. [1 ]
机构
[1] Univ Calif Irvine, Dept Phys & Biophys, Irvine, CA 92697 USA
关键词
light energy transfer; salinixanthin; proton transport; carotenoid binding;
D O I
10.1007/s00018-007-7167-y
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Retinal proteins function as photoreceptors and ion pumps. Xanthorhodopsin of Salinibacter ruber is a recent addition to this diverse family. Its novel and distinctive feature is a second chromophore, a carotenoid, which serves as light-harvesting antenna. Here we discuss the properties of this carotenoid/retinal complex most relevant to its function (such as the specific binding site controlled by the retinal) and its relationship to other retinal proteins (bacteriorhodopsin, archaerhodopsin, proteorhodopsin and retinal photoreceptors of archaea and eukaryotes). Antenna addition to a retinal protein has not been observed among the archaea and emerged in bacteria apparently in response to environmental conditions where light-harvesting becomes a limiting factor in retinal protein functioning.
引用
收藏
页码:2323 / 2328
页数:6
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