Fig. 1: Structure and function of photosystem II. | Nature Communications

Fig. 1: Structure and function of photosystem II.

From: Light-driven formation of manganese oxide by today’s photosystem II supports evolutionarily ancient manganese-oxidizing photosynthesis

Fig. 1

a Cryo-electron microscopy structure of native plant PSII (PDB entry 5XNL). The central membrane-integral subunits with cofactors of a PSII monomer are shown (cyan circle = Mn4CaO5 position). Omitting the extrinsic subunits (PsbQ, PsbP, and PsbO with approximate molecular weights of 18, 24, and 33 kDa) exposes a cavity (yellow shading, the subunits are absent in our Mn-depleted PSII). b Cofactors (truncated structures) for light-driven electron transfer in D1/D2 (YZ, tyrosine electron acceptor from Mn4CaO5; P680, primary donor chlorophyll (chl) dimer; CA,B, accessory chl; PA.B, pheophytins; QA,B, acceptor quinones; Fe, non-heme iron with bicarbonate ligand). Green/dark-red arrows: electron transfer paths upon photo-excitation (hν) of O2-evolving or Mn-depleted PSII (D/A, external electron donor/acceptor).

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