Uropathogenic Escherichia coli adhesin (FimH, FmlH, and related adhesins) (FimH (for type 1 pilus adhesin), FmlH (for F9 pilus adhesin), OmpT (outer membrane protein T); no single canonical abbreviation for the general process of "adhesion")

Uropathogenic Escherichia coli (UPEC) cause most urinary tract infections by expressing specialized surface proteins called adhesins, which mediate tight binding to receptors on uroepithelial cells despite urine flow. The best-characterized example is type 1 fimbriae, with its tip-located lectin domain (FimH) that binds oligomannose residues on bladder epithelial surfaces during early infection stages. As infection progresses and tissue becomes inflamed, other pili such as F9/Fml pilus, with its galactose-binding subunit (FmlH) become important for persistent colonization due to changes in exposed host glycans. Additional non-pilus outer membrane proteins like OmpT also contribute to adherence properties. These adhesive interactions are essential for biofilm formation, immune evasion, and establishment of chronic or recurrent infections—making them attractive targets for novel anti-infective therapies focused on blocking initial bacterial attachment rather than killing bacteria directly.

Other names

Type 1 fimbrial adhesinFimbrial tip adhesinMannose-specific adhesinGalactose-specific adhesinUPEC pili/fimbriae

Drugs or inhibitors act by: - Blocking carbohydrate-binding sites on bacterial adhesins such as FimH, preventing attachment to host urothelial cells. Immunization against specific adhesive subunits can also block colonization in animal models.