Abstract
Plants are able to tune their photosynthetic efficiency in response to large and rapid fluctuations in the quality and quantity of light. Adaptation mechanisms such as state transitions and the PSII repair cycle are largely structural, involving dynamic changes in the self-assembled distribution of photosystem (PSII) and light-harvesting (LHCII) pigment-protein complexes between stacked and unstacked regions of the thylakoid membrane. Although thylakoid grana stacks are among the most crowded biomembranes in nature, dramatic fluxes of LHCII over hundreds of nanometers can take place in a matter of minutes. The driving force and molecular mechanism behind these structural transitions are unclear. We present a coarse-grained model of protein-protein interactions in stacked grana thylakoid membranes, and simulations of the self-assembly of densely packed PSII and LHCII in changing environmental conditions.
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