Type IV pilin structural subunit (PilA) (PilA)

Type IV pilin structural subunit (PilA) is the primary protein component of Type IV pili (T4P), which are sophisticated surface appendages found in numerous Gram-negative bacterial pathogens, including Pseudomonas aeruginosa and Acinetobacter baumannii (PMID: 25691586). These pili are essential for bacterial virulence, facilitating twitching motility, adherence to host epithelial cells, and the formation of biofilms on both biological and abiotic surfaces (PMID: 15117903). By mediating the initial stages of colonization and environmental sensing, PilA plays a central role in the pathogenesis of acute and chronic infections, such as those seen in cystic fibrosis and ventilator-associated pneumonia. As a therapeutic target, PilA is being extensively researched for the development of subunit vaccines and monoclonal antibodies aimed at blocking bacterial attachment and enhancing immune clearance (PMID: 15608000). However, the significant genetic diversity and antigenic variation of the PilA protein across different clinical isolates present a major challenge for the creation of broadly effective treatments (PMID: 31085610). Furthermore, the ability of bacteria to utilize alternative adhesion mechanisms can lead to therapeutic bypass and resistance.

Other names

Major pilin subunitType IV pilinFimbrial protein PilAPilA protein

Inhibition of Type IV pilus assembly or blocking of pilus-mediated adhesion to host cell receptors to prevent colonization and infection.