Structure of photosystem II and substrate binding at room temperature Excerpt: PS II, a membrane-bound multi-subunit pigment protein complex, couples the one-electron photochemistry at the reaction centre with the four-electron redox chemistry of water oxidation at the Mn4CaO5 cluster in the oxygen-evolving complex (OEC). New, detailed snapshots capture photosynthesis at room temperature The living machinery responsible for photosynthesis – while commonplace and essential to life on Earth – is still not fully understood. It is understood at every level of…