3.E.2.2.3
Multicomponent Photosystem II of A. thaliana. It consists of 2 core proteins, PsbA and PsbD, both of 353 aas; two core antenna proteins, CP43 = PsbC, 473 aas, and CP47 = PsbB, 508 aas; two cytochrome b₅₅₉ subunits α and β = PsbE (55 aas) and PsbF (39 aas), respectively; twelve low molecular mass (LMM) proteins: PsbH (73 aas), PsbI (36 aas), PsbJ (40 aas), PsbK (61 aas), PsbL (38 aas), PsbM (34 aas), PsbR (140 aas), PsbT (33 aas), PsbW (133 aas), PsbX (116 aas), PsbY (189 aas), psbZ (62 aas); the oxygen evolving complex components (OEC) PsbO1 (332 aas), PsbO2 (331 aas), PsbP1 (263 aas), PsbP2 (125 aas), PsbQ (224 aas); and light harvesting complex II major constituents: (LHCB): LHCB1 (267 aas), LHCB2 (265 aas), LHCB3 (265 aas); minor constituents: LHCB4 (265 aas), LHCB5 (290 aas) and LHCB6 (258 aas) (Lu 2016). Photosystem II proteins, PsbL and PsbJ, regulate electron flow to the plastoquinone pool (Ohad et al. 2004).  The structure of Chlorella ohadii photosystem II revealed protective mechanisms against environmental stress (Fadeeva et al. 2023).