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dc.contributor.authorSolano-Collado, Virtu-
dc.contributor.authorLurz, Rudi-
dc.contributor.authorEspinosa, Manuel-
dc.contributor.authorBravo, Alicia-
dc.identifier.citationNucleic Acids Research 41: 6975- 6991 (2013)-
dc.descriptionEste artículo pertenece a la Tesis presentada por Virtudes Solano Collado con título: "Caracterización molecular del regulador transcripcional MgaSpn de Streptococcus pneumoniae"(https://digital.csic.es/handle/10261/98162)-
dc.description.abstractThe MgaSpn transcriptional regulator contributes to the virulence of Streptococcus pneumoniae. It is thought to be a member of the Mga/AtxA family of global regulators. MgaSpn was shown to activate in vivo the P1623B promoter, which is divergent from the promoter (Pmga) of its own gene. This activation required a 70-bp region (PB activation region) located between both promoters. In this work, we purified an untagged form of the MgaSpn protein, which formed dimers in solution. By gel retardation and footprinting assays, we analysed the binding of MgaSpn to linear double-stranded DNAs. MgaSpn interacted with the PB activation region when it was placed at internal position on the DNA. However, when it was positioned at one DNA end, MgaSpn recognized preferentially the Pmga promoter placed at internal position. In both cases, and on binding to the primary site, MgaSpn spread along the adjacent DNA regions generating multimeric protein-DNA complexes. When both MgaSpn-binding sites were located at internal positions on longer DNAs, electron microscopy experiments demonstrated that the PB activation region was the preferred target. DNA molecules totally or partially covered by MgaSpn were also visualized. Our results suggest that MgaSpn might recognize particular DNA conformations to achieve DNA-binding specificity-
dc.description.sponsorshipBFU2009-11868 to A.B.] and [CSD2008-00013- INTERMODS to M.E.] from the Spanish Ministry of Economy and Competitiveness, and [PIE-201320E028 to A.B.] from the Spanish National Research Council. Funding for open access charge: Spanish Ministry of Economy and Competitiveness [BFU2009-11868].-
dc.publisherOxford University Press-
dc.subjectBacterial proteins-
dc.subjectDNA footprinting-
dc.subjectPromoter regions-
dc.subjectTranscription factors-
dc.titleThe pneumococcal MgaSpn virulence transcriptional regulator generates multimeric complexes on linear double-stranded DNA-
dc.description.versionPeer Reviewed-
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