English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/95584
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

The pneumococcal MgaSpn virulence transcriptional regulator generates multimeric complexes on linear double-stranded DNA

AuthorsSolano-Collado, Virtu ; Lurz, Rudi; Espinosa, Manuel ; Bravo, Alicia
KeywordsBacterial proteins
DNA footprinting
Operon
Promoter regions
Genetic
Transcription factors
Issue Date2013
PublisherOxford University Press
CitationNucleic Acids Research 41: 6975- 6991 (2013)
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
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)
Publisher version (URL)http://dx.doi.org/10.1093/nar/gkt445
URIhttp://hdl.handle.net/10261/95584
DOI10.1093/nar/gkt445
ISSN0305-1048
E-ISSN1362-4962
Appears in Collections:(CAB) Artículos
(CIB) Artículos
Files in This Item:
File Description SizeFormat 
Nucl. Acids Res.-2013-Solano-Collado-6975-91.pdf10,76 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.