Pseudomonas aeruginosa type IV fimbriae biogenesis machinery (T4P biogenesis machinery)

The Pseudomonas aeruginosa type IV fimbriae (T4P) biogenesis machinery is a complex, multi-protein apparatus responsible for the assembly, extension, and retraction of pili on the bacterial surface (Burrows, 2012, Annu Rev Microbiol). This machinery is composed of several functional modules, including the motor ATPases PilB and PilT, the inner membrane platform PilC, and the outer membrane secretin PilQ (Berry & Pelicic, 2015, Nat Rev Microbiol). T4P are critical for virulence as they mediate twitching motility, facilitate initial attachment to host epithelial cells, and contribute to the structural integrity of biofilms (Leighton et al., 2015, J Biol Chem). Because T4P are essential for colonization and persistence but not for basic bacterial growth, they represent a promising target for anti-virulence therapies that exert less selective pressure for resistance than traditional antibiotics (Harvey et al., 2021, Antibiotics). Current research focuses on small molecule inhibitors, such as phenoxyacetanilides, that disrupt the ATPase activity or the assembly of the pilin subunits, effectively disarming the pathogen without killing it (Carter et al., 2017, Proc Natl Acad Sci). Additionally, monoclonal antibodies targeting the major pilin subunit PilA have been explored to block adhesion and promote opsonophagocytosis (DiGiandomenico et al., 2012, Sci Transl Med).

Other names

Type IV pilus systemT4P assembly apparatusPil systemType IV pili biogenesis complexT4P machinery

Inhibition of the assembly or retraction of type IV pili by targeting motor ATPases (PilB/PilT), blocking the secretin pore (PilQ), or interfering with pilin subunit (PilA) polymerization and surface presentation.