Table 4. Distance of ligands to the zinc ion at the active site in MP compared with PAPs and AP (Å).

Ligands (MP/PAP/AP)	MP	PAP (form1)	PAP (form2)	PAP (form3)	AP
His186/His169/His176	2.08	2.29	2.10	2.16	2.22
His190/His173/His180	2.11	2.24	2.01	2.23	2.20
His196/His173/His186	1.92	2.26	2.07	2.15	2.16
water	2.30	2.25	2.18	2.47	2.36
Tyr226/Tyr209/Tyr216	2.58	2.96	4.24	4.27	3.02