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For many gram-positive pathogens, conjugative plasmid transfer is an important means of spreading antibiotic resistance . Therefore, the search for alternative treatments to fight and prevent infections caused by these bacteria has become of major interest. In the present study, we evaluated the protein TraM, from the conjugative plasmid pIP501, as a potential vaccine candidate. Anti-TraM antiserum mediated in vitro opsonophagocytic killing of the strain harboring the pIP501 plasmid and also proved to be cross-reactive against other clinically relevant enterococcal and staphylococcal strains. Specificity of antibodies toward TraM was confirmed by results of an opsonophagocytic inhibition assay and Western blot. In addition, conjugative transfer experiments proved that TraM is essential for the transfer of pIP501. Finally, immunization with either TraM or anti-TraM antiserum reduced significantly the colony counts in mice livers, demonstrating that TraM is a promising vaccine candidate against enterococci and other gram-positive pathogens.

Targeting Type IV Secretion System Proteins to Combat Multidrug-Resistant Gram-positive Pathogens