Low-potential cytochrome c that plays a role in the oxygen-evolving complex of photosystem II. Binds 1 heme c group covalently per subunit. The cyanobacterial oxygen-evolving complex is composed of PsbO, PsbP, PsbQ, PsbV and PsbU. Associated with photosystem II at the lumenal side of the thylakoid membrane. Belongs to the cytochrome c family. PsbV subfamily.