Mechanisms of β-lactamase action
β-Lactamases continue to play an important part in antibiotic resistance in bacteria (see, for example, Medeiros, 1984). The prevalence of β-lactamases thus concerns clinicians, and stimulates pharmaceutical companies to produce (supposedly) β-lactamaseresistant drugs. β-Lactamases appear to be as diverse as they are efficient, and one of the reasons for studying their mechanisms is to bring order into their classification. This has been successful, in that a simple binary classification may apply widely. It is perhaps worth mentioning that most of the detailed knowledge of β-lactamase mechanisms dates from 1978. Thus from the point of view of their mechanisms, we can now divide those β-lactamases (or rather, those that have been studied in enough depth) into ‘serine’ enzymes and ‘metal’ enzymes. A second division splits the ‘serine’ enzymes into two classes (called class A and class C), based on their amino acid sequences (Ambler, 1980; Jaurin & Grundström, 1981).
KeywordsBacillus Cereus Bacillus Licheniformis Boronic Acid Phenylboronic Acid fromEscherichia Coli
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