title: Combination beta-lactam and beta-lactamase-inhibitor products: antimicrobial activity and efficiency of enzyme inhibition.
abstract: Classification schemes for gram-negative beta-lactamases are presented, mechanisms by which beta-lactamases inactivate beta-lactam antibiotics are reviewed, and methods for assessing the efficiency of beta-lactamase inhibitors are evaluated. Beta-lactamases are commonly produced by Staphylococcus species, the Enterobacteriaceae, Pseudomonas aeruginosa, Acinetobacter species, and some anaerobes. Currently available beta-lactamase inhibitors are thought to be "suicide inhibitors" that form stable complexes between the bacterial beta-lactamase and the beta-lactamase inhibitor in a multistep chemical reaction. Each step can be quantitated; however, the overall process is difficult to measure. Thus, a comparative evaluation of commercially available beta-lactamase inhibitors is extremely difficult and must be done under standardized test conditions. In general, sulbactam, clavulanate, and tazobactam are all potent inhibitors of staphylococcal penicillinase; chromosomal beta-lactamases produced by Bacteroides species, Proteus vulgaris, Haemophilus influenzae, Neisseria gonorrhoeae; and type IV enzymes of Klebsiella species. Although sulbactam possesses activity against TEM-1 and TEM-2 beta-lactamases, it does not have reliable activity against SHV-1 beta-lactamases. Clavulanate and tazobactam are potent inhibitors of both TEM and SHV-1 beta-lactamases. P. aeruginosa and some Enterobacteriaceae produce an inducible, extremely potent, broad-spectrum enzyme (type I beta-lactamase). Tazobactam is the only currently available. beta-lactamase inhibitor with activity against type I beta-lactamases; however, some enzymes are not inhibited by tazobactam.
authors.affiliation: College of Pharmacy, University of Minnesota, Minneapolis, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Rotschafer
authors.forename: B E
authors.initials: BE
authors.lastname: Ostergaard
mesh_terms: D000900:Anti-Bacterial Agents / Q000493:pharmacokinetics / Q000494:pharmacology / Q000627:therapeutic use*; D001419:Bacteria / Q000201:enzymology; D004359:Drug Therapy, Combination / Q000494:pharmacology / Q000627:therapeutic use; D004791:Enzyme Inhibitors; D006090:Gram-Negative Bacteria / Q000201:enzymology; D006801:Humans; D008826:Microbial Sensitivity Tests; D018440:beta-Lactam Resistance; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000096:biosynthesis / Q000145:classification; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams; D001618:beta-Lactamases