期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1777, 期 7-8, 页码 684-688出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbabio.2008.05.005
关键词
xanthorhodopsin; retinal protein; antenna carotenoid; energy transfer; fluorescence anisotropy
资金
- NIGMS NIH HHS [R37 GM029498, R37 GM029498-28, R37 GM029498-27] Funding Source: Medline
Xanthorhodopsin is a light-driven proton pump like bacteriorhodopsin, but made more effective for collecting light by its second chromophore, salinixanthin, a carotenoid. Action spectra for transport and fluorescence of the retinal upon excitation of the carotenoid indicate that the carotenoid functions as an antenna to the retinal. The calculated center-to-center distance and angle of the transition moments of the two chromophores are 11 angstrom and 56 degrees, respectively. As expected from their proximity, the carotenoid and the retinal closely interact: tight binding of the carotenoid, as indicated by its sharpened vibration bands and intense induced circular dichroism in the visible, is removed by hydrolysis of the retinal Schiff base, and restored upon reconstitution with retinal. This antenna system, simpler than photosynthetic complexes, is well-suited to study features of excited-state energy migration. (c) 2008 Elsevier B.V. All rights reserved.
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