(redirected from penicillinases)
Also found in: Thesaurus, Medical, Encyclopedia.
Related to penicillinases: cephalosporinase


Any of several beta-lactamase enzymes that cleave the beta-lactam ring in penicillins. Penicillinases are found in many penicillin-resistant bacteria.


(Medicine) any of a group of enzymes used to treat allergic reactions to penicillin
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.penicillinase - enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic
enzyme - any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
References in periodicals archive ?
Extended-spectrum [beta]-lactamase agents are point mutants of "old" penicillinases (23).
In livestock, although penicillinases such as TEM-1 and TEM-2 have been identified from cattle (23,32-34), pigs (35), and poultry (36), isolation of ESBL producers has not been reported.
Until 2000, most extended spectrum beta-lactamines (ESBLs) were mutants of classical TEM and SHV plasmid-mediated penicillinases.

Full browser ?