How does rifampicin affect gram E coli?

Rifampicin primarily targets bacterial RNA polymerase, inhibiting transcription and thus preventing the synthesis of essential proteins in Gram-negative bacteria like Escherichia coli. By disrupting RNA synthesis, rifampicin effectively stifles bacterial growth and replication. However, its efficacy can be limited due to the inherent permeability barriers of the Gram-negative cell envelope and the potential for developing resistance. Consequently, while rifampicin can be effective against E. coli, it is often used in combination with other antibiotics for enhanced effectiveness.