Elucidation of the mechanism controlling the formation of photosystem II complex by means of structural analysis of various mutants

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In order to elucidate the mechanism controlling the formation of the photosystem II complex, studies on the structures and functions of various low molecular weight subunit-deletion mutants of PSII were carried out. The crystal structure of Ycf12 (Psb30)-deletion mutant confirmed the location of Ycf12, and PSII isolated from a PsbZ-deletion mutant lacked both Ycf12 and PsbK, suggesting the requirement of PsbZ for the stable binding of these two subunits to PSII. In addition, PsbM was shown to be required for maintaining the stability of PSII dimer, while PsbI was required for the formation of PSII dimer but not required for the stability of the dimer.