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The PsbP protein, an extrinsic subunit of photosystem II (PSII) in green plants, is known to induce a conformational change around the catalytic Mn 4 CaO 5  cluster securing the binding of Ca 2+  and Cl –  in PSII. PsbP has multiple interactions with the membrane subunits of PSII, but how these affect the structure and function of PSII requires clarification. Here, we focus on the interactions between the N-terminal residues of PsbP and the α subunit of Cytochrome (Cyt)  b  559  (PsbE). A key observation was that a peptide fragment formed of the first N-terminal 15 residues of PsbP, ‘pN15’, was able to convert Cyt  b  559  into its HP form. Interestingly, addition of pN15 to NaCl-washed PSII membranes decreased PSII’s oxygen-evolving activity, even in the presence of saturating Ca 2+  and Cl –  ions. In fact, pN15 reversibly inhibited the S 1  to S 2  transition of the OEC in PSII. These data suggest that pN15 can modulate the redox property of Cyt  b  559  involved in the side-electron pathway in PSII. This potential change of Cyt  b  559 , in the absence of the C-terminal domain of PsbP, however, would interfere with any electron donation from the Mn 4 CaO 5  cluster, leading to the possibility that multiple interactions of PsbP, binding to PSII, have distinct roles in regulating electron transfer within PSII.

The N-terminal sequence of the extrinsic PsbP protein modulates the redox potential of Cyt b559 in photosystem II