A Novel Lawsonia Intracellularis Autotransporter Protein is a Prominent Antigen

Overview

Journal Clin Vaccine Immunol

Publisher American Society for Microbiology

Specialties Allergy & Immunology
Pathology

Date 2011 Jun 24

PMID 21697340

Citations 7

Authors

Eleanor Watson

Ewan M Clark

M Pilar Alberdi

Neil F Inglis

Megan Porter

Lisa Imrie

Kevin Mclean

Erin Manson

Alex Lainson

David G E Smith

Affiliations

Soon will be listed here.

Abstract

Investigation of antigenic determinants of the microaerophilic obligate intracellular bacterium Lawsonia intracellularis using a mass spectrometry approach identified a novel bacterial protein present in an extract of cell culture medium aspirated from heavily infected in vitro cell cultures. Western immunoblotting analysis of SDS-PAGE-resolved proteins using immune sera pooled from L. intracellularis-infected pigs revealed the presence of a strongly immunoreactive band of ∼ 72 kDa. Liquid chromatography-electrospray ionization-tandem mass spectrometry analysis of this component and database mining using a fully annotated L. intracellularis genome sequence and the comprehensive GenBank prokaryotic genomic database highlighted the presence of a protein that shares little sequence similarity with other prokaryotic proteins and appears to be highly species specific. Detailed bioinformatic analyses identified the protein as member of the autotransporter protein family of surface-exposed proteins, and the designation LatA (Lawsonia autotransporter protein A) is suggested. Recognition of recombinant LatA on Western blots by a panel of sera from infected and control pigs corresponded 100% with a commercial serodiagnostic that relies on in vitro culture of this fastidious organism. LatA therefore represents a potential candidate for the development of a rapid and species-specific serodiagnostic reagent.

Citing Articles

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