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Calculated ET pathways from the C3 sulfur to copper in WT P. aeruginosa azurin (PDBID: 4AZU). The H46 pathway (magenta) likely is the major coupling route in C112D and C112D/M121L azurins. The W48 pathway, which features many noncovalent elements, could be competitive with the H46 route in WT azurin, owing to Cu-S(C112) covalency. Oxygen atoms are red; nitrogen atoms are blue; sulfur atoms are yellow.
