title: Properties of novel beta-lactamase produced by Bacteroides fragilis.
abstract: Bacteroides fragilis strains were isolated from clinical specimens. B. fragilis G-237 was highly resistant to beta-lactam antibiotics due to beta-lactamase production. The purified enzyme from this strain gave a single protein band on polyacrylamide gel electrophoresis. The isoelectric point was 4.8, and the molecular weight was estimated to be 26,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme activity was inhibited by p-chloromercuribenzoate and iodine but not by clavulanic acid or sulbactam. The purified enzyme showed a unique substrate profile by hydrolyzing at a high rate most of the cephalosporins, including cephamycin derivatives, penicillins, and imipenem (formerly imipemide, N-formimidoyl thienamycin, or MK 0787).
mesh_terms: D001441:Bacteroides fragilis / Q000201:enzymology*; D055598:Chemical Phenomena; D002621:Chemistry; D007525:Isoelectric Focusing; D007700:Kinetics; D008826:Microbial Sensitivity Tests; D008970:Molecular Weight; D009070:Moxalactam / Q000378:metabolism; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000302:isolation & purification*
chemical_list: D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases; D009070:Moxalactam