Journal
FEBS LETTERS
Volume 589, Issue 15, Pages 1761-1765Publisher
WILEY
DOI: 10.1016/j.febslet.2015.05.043
Keywords
Photosynthesis; Reaction center; Electron transport; Chromatophore; Light-harvesting
Funding
- Sumitomo Foundation
- Kurata Memorial Hitachi Science and Technology Foundation
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Quinone distributions in the thermophilic purple sulfur bacterium Thermochromatium tepidum have been investigated at different levels of the photosynthetic apparatus. Here we show that, on average, the intracytoplasmic membrane contains 18 ubiquinones (UQ) and 4 menaquinones (MQ) per reaction center (RC). About one-third of the quinones are retained in the light-harvest ing-reaction center core complex (LH1-RC) with a similar ratio of UQ to MQ. The numbers of quinones essentially remains unchanged during crystallization of the LH1-RC. There are 1-2 UQ and 1 MQ associated with the RC-only complex in the purified solution sample. Our results suggest that a large proportion of the quinones are confined to the core complex and at least five UQs remain invisible in the current LH1-RC crystal structure. (C) 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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