SadA, a trimeric autotransporter from Salmonella enterica serovar Typhimurium, can promote biofilm formation and provides limited protection against infection

Dhaarini Raghunathan, Timothy J Wells, Faye C Morris, Robert K Shaw, Saeeda Bobat, Sarah E Peters, Gavin K Paterson, Karina Tveen Jensen, Denisse L Leyton, Jessica M A Blair, Douglas F Browning, John Pravin, Adriana Flores-Langarica, Jessica R Hitchcock, Claudia T P Moraes, Roxane M F Piazza, Duncan J Maskell, Mark A Webber, Robin C May, Calman A MacLennanLaura J Piddock, Adam F Cunningham, Ian R Henderson

Research output: Contribution to journalArticlepeer-review

Abstract

Salmonella enterica is a major cause of morbidity worldwide and mortality in children and immunocompromised individuals in sub-Saharan Africa. Outer membrane proteins of Salmonella are of significance because they are at the interface between the pathogen and the host, they can contribute to adherence, colonization, and virulence, and they are frequently targets of antibody-mediated immunity. In this study, the properties of SadA, a purported trimeric autotransporter adhesin of Salmonella enterica serovar Typhimurium, were examined. We demonstrated that SadA is exposed on the Salmonella cell surface in vitro and in vivo during infection of mice. Expression of SadA resulted in cell aggregation, biofilm formation, and increased adhesion to human intestinal Caco-2 epithelial cells. Immunization of mice with folded, full-length, purified SadA elicited an IgG response which provided limited protection against bacterial challenge. When anti-SadA IgG titers were enhanced by administering alum-precipitated protein, a modest additional protection was afforded. Therefore, despite SadA having pleiotropic functions, it is not a dominant, protective antigen for antibody-mediated protection against Salmonella.

Original languageEnglish
Pages (from-to)4342-4352
Number of pages11
JournalInfection and Immunity
Volume79
Issue number11
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Adhesins, Bacterial/genetics
  • Alum Compounds
  • Animals
  • Bacterial Adhesion/genetics
  • Biofilms
  • Caco-2 Cells
  • Escherichia coli K12/metabolism
  • Gene Expression Regulation, Bacterial/physiology
  • Humans
  • Immunoglobulin G
  • Membrane Proteins/genetics
  • Mice
  • Phylogeny
  • Salmonella typhimurium/genetics
  • Virulence

Fingerprint

Dive into the research topics of 'SadA, a trimeric autotransporter from Salmonella enterica serovar Typhimurium, can promote biofilm formation and provides limited protection against infection'. Together they form a unique fingerprint.

Cite this