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. Author manuscript; available in PMC: 2018 Feb 9.
Published in final edited form as: Chem Rev. 2017 Jul 21;117(15):10474–10501. doi: 10.1021/acs.chemrev.7b00117

Figure 6. X-ray crystal structure of Ni-MmARD (PDB ID: 5I91).

Figure 6

a) The crystallographic structure of Ni-MmARD. The Nickel atom is shown as a green sphere and its protein ligands His88, His90, His133 and Glu94 represented as sticks and two water molecules are shown as red dots. b) Stereo view of nickel binding in the MmARD active site. Glu94 and His88 provide the axial ligands, with His90, His133 and two water/hydroxide ligands occupying equatorial positions, yielding an octahedral coordination geometry. The metal-ligand distances (in Å) are show as red dotted lines. (Reproduced with permission from Ref 3. Copyright 2016 American Chemical Society).