Proteus species surface antigens

Proteus species surface antigens are a diverse collection of molecules found on the outer surface of bacteria within the Proteus genus, most notably Proteus mirabilis. These antigens include lipopolysaccharides (O-antigens), flagella (H-antigens), and various fimbriae or pili, such as mannose-resistant/Proteus-like (MR/P) fimbriae (Schaffer & Pearson, 2015). Biologically, these structures are essential for the organism's characteristic swarming motility and its ability to adhere to host tissues and medical devices, facilitating the formation of persistent biofilms (Armbruster et al., 2018). In human disease, these antigens are primary targets of the immune response during complicated urinary tract infections and are involved in the pathogenesis of struvite kidney stones (Norsworthy & Pearson, 2017). They are currently being investigated as primary targets for the development of vaccines and monoclonal antibodies aimed at preventing colonization in high-risk patients, such as those with long-term catheterization (Scavone et al., 2016). Furthermore, certain Proteus antigens have been hypothesized to play a role in the etiology of rheumatoid arthritis through molecular mimicry with host proteins like HLA-DRB1 (Rashid & Ebringer, 2012). Therapeutic strategies targeting these antigens aim to disrupt the initial stages of infection, such as attachment and colonization, rather than relying solely on bactericidal activity. Challenges in targeting these antigens include the high degree of antigenic variation among different Proteus strains and the potential for cross-reactivity with host tissues.

Other names

Proteus surface proteinsProteus O-antigensProteus H-antigensProteus fimbriaeProteus piliProteus mirabilis surface antigens

Induction of mucosal and systemic antibodies (IgA and IgG) that inhibit bacterial fimbrial-mediated adhesion and flagellar-mediated motility (Scavone et al., 2016).