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Crystal structure of MbnH. Active site of MbnH (PDB 6E1C) showing the five-coordinate, HS heme 1 (left) and the six-coordinate, LS heme 2 (right) (top). The mbnP (blue) and mbnH (pink) genes in M. trichosporium OB3b are found in an operon encoding the machinery to biosynthesize, regulate, and transport the copper chelator methanobactin (Mbn) (bottom).
