In the beginning, β-lactamases were designated by the name of the strain or plasmid that
produced them, a practice that persists in such enzyme names as PC1 or P99. In 1975, the …

β-Lactamases can be named on the basis of molecular characteristics or functional properties.
Molecular classes A, B, C, and D define an enzyme according to amino acid sequence …

… are not unique to β-lactamases, as they have occurred with other AMR genes, such as MCR
(mobile colistin resistance) which led to the creation of an MCR nomenclature scheme (9). …

… Approaches to β-lactamase nomenclature have focused primarily on those enzymes found
in Gram-negative bacteria. In 1968, Sawai, Mitsuhashi and Yamagishi characterized a set of …

… (194) was challenged by many in the β-lactamase community (195). Although the original
intention was to simplify β-lactamase nomenclature for the practicing physician, many thought …

… -Lactamase nomenclature has never been particularly rational. Enzymes have been named
after a preferred substrate (CARB, FUR, IMP, OXA), other biochemical properties (SHV, NBC…

… All metallo-b-lactamases have been defined as class B b-lactamases. While this
nomenclature accurately distinguishes the metallo-blactamases from the serine b-lactamases, it …

… They all inactivate penicillins and cephalosporins by opening the β-lactam ring. Many …
suggests that the β-lactamases have a polyphyletic origin. All the β-lactamases of currently known …

… However, the biological activity associated with the enzyme should be emphasized as the
most relevant attribute to a novel ,-lactamase. Nomenclature for novel enzymes has become a …

… nomenclature of GES-type ESBLs and controvertible conclusions on the relationship between
β-lactamase … On the basis of priority of nomenclature, GES-a and GES-b genes should be …