LED209 is a potent small molecule inhibitor of bacterial receptor QseC, is a potent prodrug that is highly selective for QseC. Target: Antibacterial LED209 has desirable pharmacokinetics and does not present toxicity in vitro and in rodents. This is a unique antivirulence approach, with a proven broad-spectrum activity against multiple Gram-negative pathogens that cause mammalian infections.The LED209 QseC inhibitor has a unique mode of action by acting as a prodrug scaffold to deliver a warhead that allosterically modifies QseC, impeding virulence in several Gram-negative pathogens.[1] LED209 is QseC sensor kinase inhibitor , as a potential lead compound to combat infections with Legionella or Mycobacterium spp. [2] LED209 inhibits the binding of signals to QseC, preventing its autophosphorylation and consequently inhibiting QseC-mediated activation of virulence gene expression. LED209 inhibits EHEC virulence traits in vitro. LED209 markedly inhibits the virulence of several pathogens in animals. Inhibition of signaling offers a strategy for the development of broad-spectrum antimicrobial drugs. [3]