Type IV pilus (T4P)

The Type IV pilus (T4P) is a versatile, hair-like proteinaceous appendage found on the surface of a wide range of bacterial pathogens, including Pseudomonas aeruginosa, Neisseria meningitidis, and Vibrio cholerae (Craig et al., 2019, Nature Reviews Microbiology). These structures are characterized by their ability to undergo rapid cycles of extension and retraction, a process driven by specialized motor ATPases such as PilB and PilT that enables a unique form of surface translocation known as twitching motility (Piepenbrink & Sundberg, 2016, Journal of Biological Chemistry). Beyond movement, T4P are critical for the initial stages of infection, mediating adherence to host cell receptors, facilitating the formation of microcolonies and biofilms, and participating in horizontal gene transfer through natural transformation (Berry & Pelicic, 2015, Pathogens and Disease). Because T4P are essential for virulence and colonization in many life-threatening infections, they are considered high-priority targets for the development of novel anti-virulence therapies (Kolappan et al., 2016, Communications Biology). Current therapeutic strategies include the development of monoclonal antibodies to block adhesion, small molecule inhibitors targeting the assembly ATPases, and vaccine candidates based on conserved pilin subunits (Pelicic, 2008, Current Opinion in Microbiology). However, the high degree of antigenic variation in major pilin proteins, particularly in Neisseria species, remains a significant challenge for broad-spectrum drug and vaccine design (Giltner et al., 2012, Microbiology and Molecular Biology Reviews).

Other names

Type 4 pilusT4PTwitching motility pilusBundle-forming pilusT4aPT4bP

Inhibition of pilus assembly by targeting motor ATPases or blocking the interaction between the pilus tip and host cell receptors to prevent bacterial colonization and motility.