PSBQ/PSBQ-2/PSII-Q (PHOTOSYSTEM II SUBUNIT Q-2); calcium ion binding. Identical to Oxygen-evolving enhancer protein 3-2, chloroplast precursor (PSBQ2) [Arabidopsis Thaliana] (GB:Q41932;GB:Q9M0X7); similar to PSBQ/PSBQ-1/PSBQA, calcium ion binding [Arabidopsis thaliana] (TAIR:AT4G21280.1); similar to oxygen-evolving enhancer protein 3-2 [Brassica rapa] (GB:BAF81515.1); contains InterPro domain Photosystem II oxygen evolving complex protein PsbQ; (InterPro:IPR008797)