Highly efficient energy transfer from a carbonyl carotenoid to chlorophyll a in the main light harvesting complex of Chromera velia

0433725 - BC 2015 RIV NL eng J - Journal Article
Durchan, Milan - Kesan, G. - Šlouf, M. - Fuciman, M. - Staleva, H. - Tichý, Josef - Litvín, Radek - Bína, David - Vácha, František - Polívka, Tomáš
Highly efficient energy transfer from a carbonyl carotenoid to chlorophyll a in the main light harvesting complex of Chromera velia.
Biochimica Et Biophysica Acta-Bioenergetics. Roč. 1837, č. 10 (2014), s. 1748-1755. ISSN 0005-2728. E-ISSN 1879-2650
R&D Projects: GA ČR(CZ) GAP205/11/1164; GA ČR GBP501/12/G055
Institutional support: RVO:60077344
Keywords : Energy transfer * Light-harvesting * Carbonyl carotenoids
Subject RIV: BO - Biophysics
Impact factor: 5.353, year: 2014

We report on energy transfer pathways in the main light-harvesting complex of photosynthetic relative of apicomplexan parasites, Chromera velia. This complex, denoted CLH, belongs to the family of FCP proteins and contains chlorophyll (Chl) a, violaxanthin, and the so far unidentified carbonyl carotenoid related to isofucoxanthin. The overall carotenoid-to-Chl-a energy transfer exhibits efficiency over 90% which is the largest among the FCP-like proteins studied so far. Three spectroscopically different isofucoxanthin-like molecules were identified in CLH, each having slightly different energy transfer efficiency that increases from isofucoxanthin-like molecules absorbing in the blue part of the spectrum to those absorbing in the reddest part of spectrum. Part of the energy transfer from carotenoids proceeds via the ultrafast S-2 channel of both the violaxanthin and isofucoxanthin-like carotenoid, but major energy transfer pathway proceeds via the S-1/ICT state of the isofucoxanthin-like carotenoid.
Permanent Link: http://hdl.handle.net/11104/0237876