The mammalian transcription factor forkhead box M1 (FoxM1) is induced during G1 phase, with expression continuing through S phase and mitosis. Siomycin A is a peptide thiazole antibiotic, first isolated from S. sioyaensis, that interacts with the 23S rRNA of bacteria. It inhibits FoxM1 (IC50 = ~5 µM), preventing the...

Siomycin is a macrocyclic antibiotic with potent and selective antibacterial activity discovered in 1969. Recently, siomycin was discovered to be a potent inhibitor of the oncogenic transcription factor-forkhead box M1, FoxM1 (previously known as HFH-11B, Trident, WIN or MPP2). The reduced transcription activity was...