photosystem II reaction center PsbP family protein. Identical to PsbP-related thylakoid lumenal protein 1, chloroplast precursor [Arabidopsis Thaliana] (GB:O23403); similar to PPL1 (PSBP-LIKE PROTEIN 1), calcium ion binding [Arabidopsis thaliana] (TAIR:AT3G55330.1); similar to unknown [Populus trichocarpa] (GB:ABK94442.1); contains InterPro domain Mog1/PsbP/DUF1795, alpha/beta/alpha sandwich (InterPro:IPR016124); contains InterPro domain Mog1/PsbP, alpha/beta/alpha sandwich (InterPro:IPR016123); contains InterPro domain Photosystem II oxygen evolving complex protein PsbP; (InterPro:IPR002683)