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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Ketolides lack inducibility properties of MLS(B) resistance phenotype.

Ketolides belong to a new class of semi-synthetic 14-membered-ring macrolides, which differ from erythromycin A by having a 3-keto group instead of the neutral sugar L-cladinose. The ability of these molecules and their L-cladinose counterparts to induce MLS(B) resistance in staphylococci (one strain) and streptococci (two strains) was investigated using a disc agar susceptibility method as well as measuring induction kinetics. All 14- and 15-membered ring macrolides tested showed inducing activity. In contrast, ketolides were clearly unable to induce MLS(B) resistance, a result consistent with the high in-vitro activity of this new class of antibiotics against erythromycin A-inducible resistant bacteria.[1]


  1. Ketolides lack inducibility properties of MLS(B) resistance phenotype. Bonnefoy, A., Girard, A.M., Agouridas, C., Chantot, J.F. J. Antimicrob. Chemother. (1997) [Pubmed]
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