title: Effects of some antibiotics on human erythrocyte glutathione reductase: an in vitro study.
abstract: Inhibitory effects of some antibiotics on purified human erythrocyte glutathione reductase were investigated. Human erythrocyte glutathione reductase was purified 2800-fold (29% yield) at 4 degrees C using 2', 5'-ADP Sepharose 4B affinity gel and Sephadex G-200 gel filtration chromatography. SDS polyacrylamide gel electrophoresis showed a single band for the enzyme. Imipenem, rifamycin, sulfanylacetamide, ceftazidime, chloramphenicol, seftriaxon, vancomycin, cefuroxime and ornidazole exhibited inhibitory effects but clindamycin, lincomycin, amoxicillin, amikacin exhibited activatory effects on the enzyme in vitro. The IC(50) values of imipenem, rifamycin, sulfanylacetamide, ceftazidime, chloramphenicol, seftriaxon, vancomycin, cefuroxime and ornidazole were 0.030, 0.146, 0.59, 2.476, 2.36, 2.88, 4.83, 15.43 and 19.632 mM, respectively, and the K(i) constants were 0.06 +/- 0.01, 0.275 +/- 0.10, 0.85 +/- 0.05, 3.59 +/- 0.51, 3.85 +/- 0.40, 3.71 +/- 0.60, 15.11 +/- 2.50, 23.50 +/- 2.94 and 28.49 +/- 6.50 mM, respectively. While imipenem, rifamycin, sulfanylacetamide, ceftazidime, chloramphenicol and seftriaxon cefuroxime and ornidazole showed competitive inhibition, vankomycine displayed noncompetitive inhibition.
authors.affiliation: Department of Chemistry, Ataturk University, Erzurum, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Senturk
authors.forename: O Irfan
authors.initials: OI
authors.lastname: Kufrevioglu
authors.forename: Mehmet
authors.initials: M
authors.lastname: Ciftci
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004912:Erythrocytes / Q000201:enzymology*; D005980:Glutathione Reductase / Q000037:antagonists & inhibitors* / Q000097:blood* / Q000187:drug effects / Q000302:isolation & purification; D006461:Hemolysis; D006801:Humans; D007700:Kinetics
chemical_list: D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D005980:Glutathione Reductase