The Mechanisms of Catalysis by Metallo 𝛽-Lactamases

Table 1

The zinc ligands in class B $\beta$-lactamases.

Subclass	Zn1 ligands			Zn2 ligands
B1	His116	His118	His196	Asp120	Cys221	His263
B2	Asn116	His118	His196	Asp120	Cys221	His263
B3	His/Gln116	His118	His196	Asp120	His121	His263