The dependence of excitation energy transfer pathways on conjugation length of carotenoids in purple bacterial photosynthetic antennae

Maruta, S., Kosumi, D., Horibe, T., Fujii, R., Sugisaki, M., Cogdell, R. J. and Hashimoto, H. (2011) The dependence of excitation energy transfer pathways on conjugation length of carotenoids in purple bacterial photosynthetic antennae. Physica Status Solidi B: Basic Solid State Physics, 248(2), pp. 403-407. (doi:10.1002/pssb.201000687)

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Publisher's URL: http://dx.doi.org/10.1002/pssb.201000687

Abstract

Ultrafast excited state dynamics of carotenoids in solution and bound to pigment–protein complexes have been investigated by femtosecond pump-probe spectroscopic measurements. Possible excitation energy transfer (EET) pathways between carotenoids and bacteriochlorophylls and their efficiency depend strongly on the conjugation length of carotenoids. In the case of Rhodobacter sphaeroides 2.4.1, dual EET channels from carotenoid to bacteriochlorophyll (S<sub>2</sub>   Qx and S<sub>1</sub>   Qy) upon excitation of carotenoid were observed. In the case of Rhodospirillum rubrum S1, on the other hand, the EET pathway of S<sub>1</sub>   Qy upon excitation of carotenoid was closed, whereas reverse energy transfer from bacteriochlorophyll to carotenoid was clearly observed upon excitation of bacteriochlorophyll. The role of carotenoids in the light-harvesting complexes is discussed in terms of their conjugation length.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Maruta, S., Kosumi, D., Horibe, T., Fujii, R., Sugisaki, M., Cogdell, R. J., and Hashimoto, H.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Physica Status Solidi B: Basic Solid State Physics
Publisher:Wiley-VCH Verlag
ISSN:0370-1972
ISSN (Online):1521-3951
Published Online:10 November 2010

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