Journal Article

Is the Photosystem II Complex a Monomer or a Dimer?

Mai Watanabe, Masako Iwai, Rei Narikawa and Masahiko Ikeuchi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 9, pages 1674-1680
Published in print September 2009 | ISSN: 0032-0781
Published online August 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp112
Is the Photosystem II Complex a Monomer or a Dimer?

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  • Biochemistry
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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-β-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.

Keywords: Blue-native PAGE; Dimer; Monomer; PSII; psbM; psbTc

Journal Article.  3125 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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