Bacterial adhesin (Uroepithelial) (FimH/PapG)

Bacterial adhesins, such as FimH and PapG, are critical virulence factors that mediate the attachment of uropathogenic bacteria to the host uroepithelium (Sauer et al., 2000). FimH, located at the tip of Type 1 fimbriae, specifically recognizes mannosylated uroplakins (UP1a) on bladder cells, facilitating colonization and invasion (Wu et al., 1996). PapG, found on P-fimbriae, binds to galabiose-containing glycolipids, which is particularly important for colonization of the upper urinary tract and the development of pyelonephritis (Dodson et al., 2001). These adhesins allow bacteria to resist the mechanical flushing of urine, a primary host defense mechanism. Therapeutic targeting of these proteins, primarily through competitive inhibitors like D-mannose or synthetic mannosides (e.g., GSK3882347), aims to block bacterial attachment and promote clearance (Sivick et al., 2022). This anti-adhesive approach is a promising alternative to traditional antibiotics, potentially reducing the selective pressure for antimicrobial resistance (Spaulding et al., 2017).

Other names

Uropathogenic adhesinFimbrial adhesinType 1 fimbriae adhesinP-fimbriae adhesinPili adhesinUroepithelial-binding adhesin

Competitive inhibition of bacterial binding to host uroepithelial receptors (e.g., uroplakins or glycolipids), preventing colonization and facilitating bacterial clearance by urine flow.