C-terminal processing peptidase (EC 3.4.21.102, CtpA gene product (Synechocystis sp.
), photosystem II D1 protein processing peptidase, protease Re, tail-specific protease, Tsp protease) is an enzyme.
[1][2][3] This enzyme catalyses the following chemical reaction Proteolytic processing of the X1 protein of photosystem II enables light-driven assembly of the tetranuclear manganese cluster.