glycylcycline ARO:0000042 antibiotic_resistance Glycylcyclines are a new class of antibiotics derived from tetracycline. These tetracycline analogues are specifically designed to overcome two common mechanisms of tetracycline resistance. Presently, there is only one glycylcycline antibiotic for clinical use: tigecycline. It works by inhibiting action of the prokaryotic 30S ribosome, preventing the binding of aminoacyl-tRNA. tetracycline antibiotic