J Antimicrob Chemother. 1991 Jul;28(1):47-53.

Lactate dehydrogenase activity as a cause of metronidazole resistance in Bacteroides fragilis NCTC 11295.

Narikawa S, Suzuki T, Yamamoto M, Nakamura M.

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Department of Laboratory Medicine, St Marianna University School of Medicine, Kanagawa, Japan.

Abstract

Enzymes acting on pyruvate as a parameter of the ATP regeneration system were studied as a cause of metronidazole resistance in Bacteroides fragilis NCTC 11295. The resistant strain had higher lactate dehydrogenase activity and produced more lactate than susceptible strains, suggesting that the enzyme is more active in lactic acid fermentation. Furthermore, the reaction catalysed by lactate dehydrogenase occurred up to 48 mg/L metronidazole, whereas the reaction catalysed by pyruvate: ferredoxin oxidoreductase reaction stopped at 2 mg/L. The mechanism of metronidazole resistance in B. fragilis NCTC 11295 may be due to the high activity of lactate dehydrogenase which compensates for the decreased activity of pyruvate: ferredoxin oxidoreductase in the presence of metronidazole.

PMID:: 1769942; [PubMed - indexed for MEDLINE]

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