{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T22:35:42Z","timestamp":1778711742132,"version":"3.51.4"},"reference-count":99,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,1,21]],"date-time":"2025-01-21T00:00:00Z","timestamp":1737417600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"<jats:p><jats:italic>Borrelia burgdorferi<\/jats:italic> exists in a complex enzootic life cycle requiring differential gene regulation. P66, a porin and adhesin, is upregulated and essential during mammalian infection, but is not produced or required within the tick vector. We sought to determine whether the porin function of P66 is essential for infection. Vancomycin treatment of <jats:italic>B. burgdorferi<\/jats:italic> cultures was used to screen for P66 porin function and found to generate spontaneous mutations in <jats:italic>p66<\/jats:italic> (<jats:italic>bb0603<\/jats:italic>). Three novel, spontaneous, missense P66 mutants (G175V, T176M, and G584R) were re-created by site-directed mutagenesis in an infectious strain background and tested for infectivity in mice by ID<jats:sub>50<\/jats:sub> experiments. Two of the three mutants retained infectivity comparable to the isogenic control, suggesting that <jats:italic>B. burgdorferi<\/jats:italic> can tolerate alteration to P66 porin function during infection. The third mutant exhibited highly attenuated infectivity and produced low levels of P66 protein. Interestingly, four isolates that were recovered for <jats:italic>p66<\/jats:italic> sequencing from mouse tissues revealed novel secondary point mutations in genomic <jats:italic>p66<\/jats:italic>. However, these secondary mutations did not rescue P66 porin function. New structural modeling of P66 is presented and consistent with these experimental results. This is the first work to assess the contribution of P66 porin function to <jats:italic>B. burgdorferi<\/jats:italic> pathogenesis.<\/jats:p>","DOI":"10.3389\/fcimb.2024.1528456","type":"journal-article","created":{"date-parts":[[2025,1,21]],"date-time":"2025-01-21T08:36:32Z","timestamp":1737448592000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Borrelia burgdorferi tolerates alteration to P66 porin function in a murine infectivity model"],"prefix":"10.3389","volume":"14","author":[{"given":"Christa H.","family":"Fierros","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marie-Line","family":"Faucillion","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Beth L.","family":"Hahn","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Phillip","family":"Anderson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mari","family":"Bonde","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julie R.","family":"Kessler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthew C.","family":"Surdel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyler S.","family":"Crawford","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan","family":"Gao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jieqing","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sven","family":"Bergstr\u00f6m","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jenifer","family":"Coburn","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2025,1,21]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"323","DOI":"10.1016\/S0378-1119(00)00285-7","article-title":"Identification and characterization of the gltK gene encoding a membrane-associated glucose transport protein of Pseudomonas aeruginosa","volume":"253","author":"Adewoye","year":"2000","journal-title":"Gene"},{"key":"B2","doi-asserted-by":"publisher","first-page":"679","DOI":"10.1046\/j.1432-1327.1998.2540679.x","article-title":"The porin RafY encoded by the raffinose plasmid pRSD2 of Escherichia coli forms a general diffusion pore and not a carbohydrate-specific porin","volume":"254","author":"Andersen","year":"1998","journal-title":"Eur. 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