title: Calorimetric analysis of cephalosporins using an immobilized TEM-1 beta-lactamase on Ni2+ chelating sepharose fast flow.
abstract: Two beta-lactamases, penicillinase type I from Bacillus cereus and TEM-1 beta-lactamase from Haemophilus ducreyi, were immobilized on a Chelating Sepharose Fast Flow column loaded with Ni2+ in an active form. Flow-injection analysis of beta-lactams was performed by using an enzyme column reactor fitted into the enzyme thermistor. With both enzymes it was possible to monitor both penicillins and cephalosporins. Moreover, Michaelis constants of the TEM-1 beta-lactamase were markedly increased upon immobilization for all substrates, especially carbenicillin, cephaloridine, and cefoperazone.
authors.affiliation: Department of Pure and Applied Biochemistry, Lund University, Lund, Sweden.
authors.forename: R
authors.initials: R
authors.lastname: Lawung
authors.forename: B
authors.initials: B
authors.lastname: Danielsson
authors.forename: V
authors.initials: V
authors.lastname: Prachayasittikul
authors.forename: L
authors.initials: L
authors.lastname: Bülow
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis / Q000378:metabolism; D001409:Bacillus cereus / Q000201:enzymology; D002151:Calorimetry; D002228:Carbenicillin / Q000032:analysis / Q000378:metabolism; D002438:Cefoperazone / Q000032:analysis / Q000378:metabolism; D002509:Cephaloridine / Q000032:analysis / Q000378:metabolism; D002511:Cephalosporins / Q000032:analysis* / Q000378:metabolism; D002614:Chelating Agents; D002846:Chromatography, Affinity; D002847:Chromatography, Agarose / Q000379:methods*; D004800:Enzymes, Immobilized; D006191:Haemophilus ducreyi; D009532:Nickel; D010405:Penicillinase / Q000378:metabolism*; D010406:Penicillins / Q000032:analysis; D001618:beta-Lactamases / Q000378:metabolism*; D047090:beta-Lactams / Q000032:analysis / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D002614:Chelating Agents; D004800:Enzymes, Immobilized; D010406:Penicillins; D047090:beta-Lactams; D009532:Nickel; D002438:Cefoperazone; D010405:Penicillinase; D001618:beta-Lactamases; C034413:beta-lactamase TEM-1; D002228:Carbenicillin; D002509:Cephaloridine