Sancycline

Sancycline is a semisynthetic tetracycline antibiotic that is more active than tetracycline against 339 strains of anaerobic bacteria (average MIC90s = 1 and 32 µg/ml, respectively). Sancycline is active against tetracycline-resistant E. coli, S. aureus, and E. faecalis strains with MICs ranging from 0.06 to 1 µg/ml. In vivo, sancycline is active against S. aureus in mice with ED50 values of 0.46 and 0.6 mg/kg for intravenous and subcutaneous administration, respectively. Like other tetracyclines, sancycline acts by reversibly binding to the 30S ribosomal subunit and inhibiting protein translation by blocking entry of aminoacyl-tRNA into the ribosome A site.