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Active site region of the (MtaBC)2 complex. Zinc(II) (in green) is ligated to Glu-164, Cys-220, and Cys-269, forming a novel zinc coordination motif. The surrounding of the zinc(II) is dominated by acidic residues. The putative potassium ion is shown in pink. The cobalt is penta-coordinated with His-136 as axial ligand on the α-face of the 5-hydroxybenzimidazolyl cob(II)amide.
