Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
Volume 1827, Issue 3, Pages 420-426Publisher
ELSEVIER
DOI: 10.1016/j.bbabio.2012.12.009
Keywords
Excitation-energy transfer; Light-harvesting complex; Photosystem; State transitions; Supercomplex
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Funding
- Netherlands Organisation for Scientific Research (NWO), Earth and Life Sciences (ALW), through a Vici grant
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LHCII, the most abundant membrane protein on earth, is the major light-harvesting complex of plants It is generally accepted that LHCII is associated with Photosystem II and only as a short-term response to overexcitation of PSII a subset moves to Photosystem I, triggered by its phosphorylation (state1 to state2 transition). However, here we show that in most natural light conditions LHCII serves as an antenna of both Photosystem I and Photosystem II and it is quantitatively demonstrated that this is required to achieve excitation balance between the two photosystems. This allows for acclimation to different light intensities simply by regulating the expression of LHCII genes only. It is demonstrated that indeed the amount of LHCII that is bound to both photosystems decreases when growth light intensity increases and vice versa. Finally, time-resolved fluorescence measurements on the photosynthetic thylakoid membranes show that LHCII is even a more efficient light harvester when associated with Photosystem I than with Photosystem II. (C) 2013 Elsevier B.V. All rights reserved.
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