Alshayea A

Barrow PA

Bavro VN

Bobat S

Bryant JA

Channell WM

Chun BJ

Cook CN

Cunningham AF

Dominguez-Medina CC

Gumbart JC

Henderson IR

Horsnell WG

Hwang H

Jossi SE

Lakey JH

Logan E

Lopez-Macias C

MacLennan CA

Marshall JL

Morris FC

Perez-Toledo M

Rossiter AE

Schager AE

Lipopolysaccharide (LPS) O-antigen (O-Ag) is known to limit antibody binding to surface antigens, although the relationship between antibody, O-Ag and other outer-membrane antigens is poorly understood. Here we report, immunization with the trimeric porin OmpD from Salmonella Typhimurium (STmOmpD) protects against infection. Atomistic molecular dynamics simulations indicate this is because OmpD trimers generate footprints within the O-Ag layer sufficiently sized for a single IgG Fab to access. While STmOmpD differs from its orthologue in S. Enteritidis (SEn) by a single amino-acid residue, immunization with STmOmpD confers minimal protection to SEn. This is due to the OmpD-O-Ag interplay restricting IgG binding, with the pairing of OmpD with its native O-Ag being essential for optimal protection after immunization. Thus, both the chemical and physical structure of O-Ag are key for the presentation of specific epitopes within proteinaceous surface-antigens. This enhances combinatorial antigenic diversity in Gram-negative bacteria, while reducing associated fitness costs

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Outer membrane protein size and LPS O-antigen define protective antibody targeting to the <em>Salmonella </em>surface

https://eprint.ncl.ac.uk/file_store/production/263902/0E8D7207-6D7F-467D-AD54-0FF2C88A94E7.pdf

Outer membrane protein size and LPS O-antigen define protective antibody targeting to the <em>Salmonella </em>surface

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