Oxygen-evolving enhancer protein 1, chloroplastic MAASLQAAATVMPAKIGGRASSARPSSHVARAFGVDAGARITCSLQSDIREVASKCADAAKMAGFALATSALLVSGATAEGAPKRLTFDEIQSKTYMEVKGTGTANQCPTIDGGVDSFPFKAGKYEMKKFCLEPTSFTVKAEGIQKNEPPRFQKTKLMTRLTYTLDEMEGPLEVRRRRTLKFEEKDGIDYAAVTVQLPGGERVAFLFTVKQLVATGKPESFRPFLVPSYRGSSFLDPKGRGGSTGYDNAGALPRGGRGDEEELAKENVKNASSSTGNITLSVTKSKPETGEVIGVFESVQPSDTDLEAPKDVKIQGVWYAQLESN 33 kDa thylakoid membrane protein 33 kDa subunit of oxygen evolving system of photosystem II 325 OEC 33 kDa subunit PSBO_WHEAT PSBO Stabilizes the manganese cluster which is the primary site of water splitting (By similarity).