Approaches targeting the type III secretion system to treat or prevent bacterial infections

Expert Opinion on Drug Discovery
Nuno Charro, Luís Jaime Mota

Abstract

The type III secretion system (T3SS) injectisome is an essential virulence mechanism used by many bacterial pathogens to inject host cells with effector proteins. Bacteria harboring T3SSs can cause significant disease in humans. As bacterial antibiotic resistance is a major concern, alternative prophylaxis and therapeutics are needed and T3SSs are a target for anti-virulence drugs. In this article, the authors review whole-cell-based high-throughput screens (HTSs), which have been the main approach used to identify small molecules inhibiting T3SSs. The authors review this in the context of particular characteristics of T3SSs. Furthermore, they also describe the follow-up approaches used to study the inhibitors found. The authors also highlight target-based approaches to find inhibitors of specific T3SS components. Finally, the authors briefly review strategies used to find inhibitors of effectors or of effector-activated host cell pathways, and approaches based on T3SSs for active or passive immunization and rational vaccine design. Future efforts targeting T3SS to prevent or treat bacterial infections should focus on deciphering the mode of action of inhibitors and on target-based approaches. The aim should not only be to find...Continue Reading

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