Broadband 2D electronic spectroscopy reveals a carotenoid dark state in purple bacteria

Ostroumov, E.E., Mulvaney, R.M., Cogdell, R.J. and Scholes, G.D. (2013) Broadband 2D electronic spectroscopy reveals a carotenoid dark state in purple bacteria. Science, 340(6128), pp. 52-56. (doi:10.1126/science.1230106)

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Abstract

Although the energy transfer processes in natural light-harvesting systems have been intensively studied for the past 60 years, certain details of the underlying mechanisms remain controversial. We performed broadband two-dimensional (2D) electronic spectroscopy measurements on light-harvesting proteins from purple bacteria and isolated carotenoids in order to characterize in more detail the excited-state manifold of carotenoids, which channel energy to bacteriochlorophyll molecules. The data revealed a well-resolved signal consistent with a previously postulated carotenoid dark state, the presence of which was confirmed by global kinetic analysis. The results point to this state’s role in mediating energy flow from carotenoid to bacteriochlorophyll.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Ostroumov, E.E., Mulvaney, R.M., Cogdell, R.J., and Scholes, G.D.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Science
Publisher:American Association for the Advancement of Science
ISSN:0036-8075
ISSN (Online):1095-9203

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