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(A) Scheme of the Ni2+ interaction with six ligands in the Ni-HpUreE structure. The A/B dimer is shown in gray, and the symmetry related dimer A′/B′ is shown with a dashed line. The ambiguous interaction with His154A is drawn with a gray line. (B) Scheme of the two Zn2+ ions interactions with four ligands each, in the Zn-HpUreE structure. Dimers A/B and C/D are shown in gray. The alternative interactions with His152A and Glu154A are shown using a gray line.
