Figure 1 | Scientific Reports

Figure 1

From: Photochemically induced dynamic nuclear polarization NMR on photosystem II: donor cofactor observed in entire plant

Figure 1

The PS2 core complex (a) is embedded inside the thylakoid membrane (not shown). At the heart of the core complex, the PS2 reaction center (RC) is found (b) and mainly formed by the central D1 and D2 polypeptides. The PS2 RC contains several cofactors (c): two central Chls (PD1 and PD2), two accessory Chls (ChlD1 and ChlD2), two pheophytins (PheD1 and PheD2), two quinones (QA and QB), and two peripheral Chls (ChlP1 and ChlP2). These cofactors are arranged in two symmetrical branches, an active D1 branch (left) and an inactive D2 branch (right). Two β-carotenoids (CarD2 and CarD1) are associated with the PS2 core complex. At the PD1 side, a tyrosine residue TyrZ is in between PD1 and the oxygen evolving system (OEC).

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