Salmonella outer membrane protein (OMP)

Salmonella outer membrane proteins (OMPs) are a diverse group of surface-exposed proteins, primarily beta-barrel porins like OmpA, OmpC, and OmpF, that play critical roles in the structural integrity and environmental adaptation of Salmonella species (UniProt: P0A290). These proteins function as channels for the passive diffusion of small hydrophilic molecules, including nutrients and certain classes of antibiotics, across the outer membrane (PubMed: 25690511). Beyond transport, OMPs are vital for bacterial adhesion to host cells, invasion, and evasion of the host immune system, making them significant virulence factors (PubMed: 18474482). In the context of therapeutics, OMPs are highly immunogenic and are extensively studied as primary candidates for subunit vaccines against typhoid fever and non-typhoidal salmonellosis (PubMed: 30243475). Additionally, alterations in OMP expression or structure are a major mechanism of antimicrobial resistance, as reduced porin permeability can limit the intracellular accumulation of drugs like fluoroquinolones and beta-lactams (PubMed: 22564872). Their accessibility on the bacterial surface also makes them attractive targets for diagnostic assays and monoclonal antibody therapies.

Other names

SOMPSalmonella porinOuter membrane porinSurface proteinOmpAOmpCOmpFOmpD

Induction of protective humoral and cellular immune responses through antigenic recognition by B and T cells; serves as a conduit for the entry of hydrophilic antibiotics into the periplasmic space.