TABLE III.

Key Active-Site Interactions^†

Atom pair	Distance (Å)
Asp14 Oδ–Co2+	2.0 ± 0.04
Asp107 Oδ–Co2+	2.0 ± 0.06
Asp16O–Co2+	2.1 ± 0.04
Water–Co2+	2.1 ± 0.06
Asp14 Oδ–Lys84 Nε	2.8 ± 0.20
Lys84 Nε–sulfate O	2.8 ± 0.11
Water–sulfate O	2.8 ± 0.17
Arg60 Nε–sulfate O	2.8 ± 0.13a

^†Average distances for 12 monomers in the asymmetric unit.

^aArg60 interacts with the sulfate in only 4 of the 12 subunits.