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The envelope of <jats:italic>Brucella<\/jats:italic> exhibits unique characteristics that make these bacteria furtive pathogens and resistant to several host defence compounds. We have identified a <jats:italic>Brucella suis<\/jats:italic> gene (<jats:italic>mapB<\/jats:italic>) that appeared to be crucial for cell envelope integrity. Indeed, the typical resistance of <jats:italic>Brucella<\/jats:italic> to both lysozyme and the cationic lipopeptide polymyxin B was markedly reduced in a \u2206<jats:italic>mapB<\/jats:italic> mutant. MapB turned out to represent a TamB orthologue. This last protein, together with TamA, a protein belonging to the Omp85 family, form a complex that has been proposed to participate in the translocation of autotransporter proteins across the outer membrane (OM). Accordingly, we observed that MapB is required for proper assembly of an autotransporter adhesin in the OM, as most of the autotransporter accumulated in the mutant cell periplasm. Both assessment of the relative amounts of other specific outer membrane proteins (OMPs) and a proteome approach indicated that the absence of MapB did not lead to an extensive alteration in OMP abundance, but to a reduction in the relative amounts of a protein subset, including proteins from the Omp25\/31 family. Electron microscopy revealed that \u2206<jats:italic>mapB<\/jats:italic> cells exhibit multiple anomalies in cell morphology, indicating that the absence of the TamB homologue in <jats:italic>B<\/jats:italic>. <jats:italic>suis<\/jats:italic> severely affects cell division. Finally, \u2206<jats:italic>mapB<\/jats:italic> cells were impaired in macrophage infection and showed an attenuated virulence phenotype in the mouse model. Collectively, our results indicate that the role of <jats:italic>B<\/jats:italic>. <jats:italic>suis<\/jats:italic> TamB homologue is not restricted to participating in the translocation of autotransporters across the OM but that it is essential for OM stability and protein composition and that it is involved in cell envelope biogenesis, a process that is inherently coordinated with cell division.<\/jats:p>","DOI":"10.1038\/s41598-018-37668-3","type":"journal-article","created":{"date-parts":[[2019,2,15]],"date-time":"2019-02-15T11:03:55Z","timestamp":1550228635000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["MapB, the Brucella suis TamB homologue, is involved in cell envelope biogenesis, cell division and virulence"],"prefix":"10.1038","volume":"9","author":[{"given":"Magal\u00ed Graciela","family":"Bialer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ver\u00f3nica","family":"Ruiz-Ranwez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriela","family":"Sycz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia Marcela","family":"Estein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela Marta","family":"Russo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia","family":"Altabe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rodrigo","family":"Sieira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angeles","family":"Zorreguieta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,2,15]]},"reference":[{"key":"37668_CR1","doi-asserted-by":"crossref","unstructured":"Seleem, M. 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