Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species
In addition to harmless commensal species, Neisseria genus encompasses two pathogenic species, N. meningitidis (the meningococcus) and N. gonorrhoeae (the gonococcus), which are responsible for meningitis and genital tract infections, respectively. Since the publication of the first Neisseria genome...
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doaj-443e3bd3e29045c4b9fbd55d02cfbd682020-11-25T00:09:19ZengShared Science Publishers OGMicrobial Cell2311-26382015-03-0123889010.15698/mic2015.03.194Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria speciesAnne Jamet0Xavier Nassif1Instituto de Microbiologia, Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.Institut Necker Enfants-Malades, 14 rue Maria Helena Vieira Da Silva, CS 61431, 75014 Paris, France.In addition to harmless commensal species, Neisseria genus encompasses two pathogenic species, N. meningitidis (the meningococcus) and N. gonorrhoeae (the gonococcus), which are responsible for meningitis and genital tract infections, respectively. Since the publication of the first Neisseria genome in 2000, the presence of several genomic islands (GI) comprising maf genes has been intriguing. These GIs account for approximately 2% of the genome of the pathogenic Neisseria species and the function of the proteins encoded by maf genes remained unknown. We showed that maf genes encode a functional toxin-immunity system where MafB is a toxin neutralized by an immunity protein named MafI. A strain can harbor several MafB/MafI modules with distinct toxic activities. MafB toxins are polymorphic toxins with a conserved N-terminal region and a variable C-terminal region. MafB N-terminal regions consist of a signal peptide and a domain named DUF1020 that is only found in the genus Neisseria. MafB C-terminal regions are highly polymorphic and encode toxic activities. We evidenced the presence of MafB in the culture supernatant of meningococcal cells and we observed a competitive advantage for a strain overexpressing a MafB toxin. Therefore, we characterized a highly variable family of toxin-immunity modules found in multiple loci in pathogenic Neisseria species.http://microbialcell.com/researcharticles/characterization-of-the-maf-family-of-polymorphic-toxins-in-pathogenic-neisseria-species/NeisseriaMafBtoxinimmunity gene |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anne Jamet Xavier Nassif |
spellingShingle |
Anne Jamet Xavier Nassif Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species Microbial Cell Neisseria MafB toxin immunity gene |
author_facet |
Anne Jamet Xavier Nassif |
author_sort |
Anne Jamet |
title |
Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species |
title_short |
Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species |
title_full |
Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species |
title_fullStr |
Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species |
title_full_unstemmed |
Characterization of the Maf family of polymorphic toxins in pathogenic Neisseria species |
title_sort |
characterization of the maf family of polymorphic toxins in pathogenic neisseria species |
publisher |
Shared Science Publishers OG |
series |
Microbial Cell |
issn |
2311-2638 |
publishDate |
2015-03-01 |
description |
In addition to harmless commensal species, Neisseria genus encompasses two pathogenic species, N. meningitidis (the meningococcus) and N. gonorrhoeae (the gonococcus), which are responsible for meningitis and genital tract infections, respectively. Since the publication of the first Neisseria genome in 2000, the presence of several genomic islands (GI) comprising maf genes has been intriguing. These GIs account for approximately 2% of the genome of the pathogenic Neisseria species and the function of the proteins encoded by maf genes remained unknown. We showed that maf genes encode a functional toxin-immunity system where MafB is a toxin neutralized by an immunity protein named MafI. A strain can harbor several MafB/MafI modules with distinct toxic activities. MafB toxins are polymorphic toxins with a conserved N-terminal region and a variable C-terminal region. MafB N-terminal regions consist of a signal peptide and a domain named DUF1020 that is only found in the genus Neisseria. MafB C-terminal regions are highly polymorphic and encode toxic activities. We evidenced the presence of MafB in the culture supernatant of meningococcal cells and we observed a competitive advantage for a strain overexpressing a MafB toxin. Therefore, we characterized a highly variable family of toxin-immunity modules found in multiple loci in pathogenic Neisseria species. |
topic |
Neisseria MafB toxin immunity gene |
url |
http://microbialcell.com/researcharticles/characterization-of-the-maf-family-of-polymorphic-toxins-in-pathogenic-neisseria-species/ |
work_keys_str_mv |
AT annejamet characterizationofthemaffamilyofpolymorphictoxinsinpathogenicneisseriaspecies AT xaviernassif characterizationofthemaffamilyofpolymorphictoxinsinpathogenicneisseriaspecies |
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