title: Testing the vaccine potential of PilV, PilX and ComP, minor subunits of Neisseria meningitidis type IV pili.
abstract: Because meningitis and septicaemia caused by Neisseria meningitidis are major public health problems worldwide, the design of a broadly protective vaccine remains a priority. Type IV pili (Tfp) are surface-exposed filaments playing a key role in pathogenesis in a variety of bacterial species, including N. meningitidis, that have demonstrated vaccine potential. Unfortunately, in the meningococcus, the major pilus subunit PilE usually undergoes extensive antigenic variation and is therefore not suitable as a vaccine component. However, we have recently shown that N. meningitidis Tfp contain low abundance subunits PilX, PilV and ComP, collectively called minor pilins, that are highly conserved and modulate Tfp-linked functions key to pathogenesis. This prompted us to examine the vaccine potential of these proteins by assessing whether sera directed against them have bactericidal properties and/or are able to interfere with Tfp-linked functions. Here we show that minor pilin proteins are recognized by sera of patients convalescent from meningococcal disease and that antibodies directed against some of them can selectively interfere with Tfp-linked functions. This shows that, despite their apparent inability to elicit bactericidal antibodies, minor pilins might have vaccine potential.
authors.affiliation: Section of Microbiology, Department of Medicine, Imperial College London, London, UK.
authors.forename: Ana
authors.initials: A
authors.lastname: Cehovin
authors.forename: J Simon
authors.initials: JS
authors.lastname: Kroll
authors.forename: Vladimir
authors.initials: V
authors.lastname: Pelicic
mesh_terms: D000595:Amino Acid Sequence; D000940:Antigenic Variation; D001426:Bacterial Proteins / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology*; D001770:Blood Bactericidal Activity; D002448:Cell Adhesion / Q000276:immunology; D002449:Cell Aggregation / Q000276:immunology; D002465:Cell Movement / Q000276:immunology; D002675:Child, Preschool; D017124:Conserved Sequence; D061269:DNA Transformation Competence / Q000276:immunology; D005260:Female; D010861:Fimbriae, Bacterial / Q000276:immunology*; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D008297:Male; D008589:Meningococcal Infections / Q000097:blood / Q000276:immunology* / Q000517:prevention & control; D009345:Neisseria meningitidis / Q000276:immunology*
chemical_list: D001426:Bacterial Proteins; D001428:Bacterial Vaccines; D007106:Immune Sera; C077573:PilV protein, Bacteria; C081816:pilF protein, Neisseria