Ketolides

  Ketolides are antibiotics belonging to the macrolide group. Ketolides are derived from erythromycin by substituting the cladinose sugar with a keto-group and attaching a cyclic carbamate group in the lactone ring. These modifications give ketolides much broader spectrum than other macrolides. Moreover, ketolides are effective against macrolide-resistant bacteria, due to their ability to bind at two sites at the bacterial ribosome. Keytolides block protein synthesis by binding to ribosomal subunits and may also inhibit the formation of newly forming ribosomes.

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The only ketolide on the market at this moment is telithromycin, which is sold under the brand name of Ketek.

Another promising ketolide is cethromycin.