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Stereoview of Pchlide binding in the ADP•AlF3–stabilized DPOR complex. Three polar amino acid residues are relevant for protonation at C-17 and C-18: residues His394 and Arg48 are located on one B subunit, whereas Asp290′ is provided by the other B subunit. The water molecule in close proximity to C-18 may act as a proton donor, whereas a second water molecule serves as an axial ligand to the central magnesium. The 2Fo–Fc electron density is contoured at 1.0 σ.
