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Plant Cell Physiol. 2009 Sep;50(9):1674-80. doi: 10.1093/pcp/pcp112. Epub 2009 Aug 10.

Is the photosystem II complex a monomer or a dimer?

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Department of Life Sciences (Biology), Graduate School of Arts and Science, University of Tokyo, Meguro, Tokyo, Japan.


It is widely believed that the photosystem II (PSII) complex may function as a dimer in the thylakoid membrane. Here, we report experimental conversion from the monomeric PSII to the dimeric form by treatment with high concentrations of n-dodecyl-beta-D-maltopyranoside (DM). The content of the PSII monomer in a PsbTc deletion mutant was much higher than in the wild type when solubilized with low concentrations of DM. However, upon treatment with higher concentrations of DM, the PSII dimer was also recovered in the PsbTc deletion mutant. These results suggest that there are at least two distinct processes of dimerization: (i) PsbTc dependent and (ii) DM induced. We discuss the results with regard to the native assembly form(s) of PSII.

[Indexed for MEDLINE]

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