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In this study, we showed that BB0616 was not surface-exposed or associated with the membrane through localization analyses using proteinase K digestion and cell partitioning assays. The expression of\n              <jats:italic>bb0616<\/jats:italic>\n              was influenced by a reduced pH but not by growth phases, elevated temperatures, or carbon sources during\n              <jats:italic>in vitro<\/jats:italic>\n              cultivation. A transcriptional start site for\n              <jats:italic>bb0616<\/jats:italic>\n              was identified by using 5\u2032 rapid amplification of cDNA ends, which led to the identification of a functional promoter in the 5\u2032 regulatory region upstream of\n              <jats:italic>bb0616<\/jats:italic>\n              . By analyzing a\n              <jats:italic>bb0616<\/jats:italic>\n              -deficient mutant and its isogenic complemented counterparts, we found that the infectivity potential of the mutant was significantly attenuated. The inactivation of\n              <jats:italic>bb0616<\/jats:italic>\n              displayed no effect on borrelial growth in the medium or resistance to oxidative stress, but the mutant was significantly more susceptible to osmotic stress. In addition, the production of global virulence regulators such as BosR and RpoS as well as virulence-associated outer surface lipoproteins OspC and DbpA was reduced in the mutant. These phenotypes were fully restored when gene mutation was complemented with a wild-type copy of\n              <jats:italic>bb0616<\/jats:italic>\n              . Based on these findings, we concluded that the hypothetical protein BB0616 is required for the optimal infectivity of\n              <jats:italic>B. burgdorferi<\/jats:italic>\n              , potentially by impacting\n              <jats:italic>B. burgdorferi<\/jats:italic>\n              virulence gene expression as well as survival of the spirochete under stressful conditions.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/iai.00090-24","type":"journal-article","created":{"date-parts":[[2024,5,3]],"date-time":"2024-05-03T13:00:56Z","timestamp":1714741256000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Assessment of the hypothetical protein BB0616 in the murine infection of\n            <i>Borrelia burgdorferi<\/i>"],"prefix":"10.1128","volume":"92","author":[{"given":"Christina","family":"Thompson","sequence":"first","affiliation":[{"name":"Department of Molecular Medicine, University of South Florida, Tampa, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Connor","family":"Waldron","sequence":"additional","affiliation":[{"name":"Department of Molecular Medicine, University of South Florida, Tampa, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sierra","family":"George","sequence":"additional","affiliation":[{"name":"Department of Molecular Medicine, University of South Florida, Tampa, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7427-1856","authenticated-orcid":true,"given":"Zhiming","family":"Ouyang","sequence":"additional","affiliation":[{"name":"Department of Molecular Medicine, University of South Florida, Tampa, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_4_2_2","doi-asserted-by":"publisher","DOI":"10.3201\/eid2702.202731"},{"key":"e_1_3_4_3_2","doi-asserted-by":"publisher","DOI":"10.15585\/mmwr.ss6622a1"},{"key":"e_1_3_4_4_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM198303313081301"},{"key":"e_1_3_4_5_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.7043737"},{"key":"e_1_3_4_6_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM198303313081302"},{"key":"e_1_3_4_7_2","doi-asserted-by":"publisher","DOI":"10.21775\/cimb.042.409"},{"key":"e_1_3_4_8_2","doi-asserted-by":"publisher","DOI":"10.1128\/JB.01158-10"},{"key":"e_1_3_4_9_2","doi-asserted-by":"publisher","DOI":"10.1038\/37551"},{"key":"e_1_3_4_10_2","first-page":"317","article-title":"Small RNAs of Borrelia burgdorferi: characterizing functional regulators in a sea of sRNAs","volume":"90","author":"Lybecker MC","year":"2017","unstructured":"Lybecker MC, Samuels DS. 2017. 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