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Bacterial lipoproteins are a set of membrane proteins with various functions; many of which are virulence factors of pathogenic bacteria. In the present study, we investigated the role of an outer membrane lipoprotein Lip40 in the pathogenesis of  Actinobacillus pleuropneumoniae . A mutant strain (Δ lip40 ) lacking Lip40 and a complemented strain (CΔ lip40 ) were constructed. Δ lip40  exhibited reduced adherence to the St. Jude porcine lung cells. The ability of the Δ lip40  mutant to colonize the mouse lung tissues was significantly impaired compared to that of the wild type and complementation strains. Furthermore, an infection assay revealed that pigs infected with Δ lip40  showed fewer clinical signs and lung lesions, indicating that Lip40 contributed to the development of porcine pleuropneumonia. Collectively, our data suggest that Lip40 is involved in the virulence of  A. pleuropneumoniae .

Outer Membrane Lipoprotein Lip40 Modulates Adherence, Colonization, and Virulence of Actinobacillus pleuropneumoniae