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Residues putatively involved in facilitating proton transfer from the periplasm to the active site (4, 32). The residue numbers are for the cNOR from T. thermophilus, and the structure is drawn from the coordinates of the cNOR from P. aeruginosa PDB ID code 3O0R (4). The surfaces of NorC and NorB subunits are shown in orange and yellow, respectively. Arrows illustrate the proposed proton pathways.
