Streptococcus pneumoniae TIGR4 flavodoxin: Structural and biophysical characterization of a novel drug target

Rodríguez-Cardenas, Á. ; Rojas, A.L. ; Conde-Giménez, M. (Universidad de Zaragoza) ; Velazquez-Campoy, A. (Universidad de Zaragoza) ; Hurtado-Guerrero, R. (Universidad de Zaragoza) ; Sancho, J. (Universidad de Zaragoza)

Resumen: Streptococcus pneumoniae (Sp) strain TIGR4 is a virulent, encapsulated serotype that causes bacteremia, otitis media, meningitis and pneumonia. Increased bacterial resistance and limited efficacy of the available vaccine to some serotypes complicate the treatment of diseases associated to this microorganism. Flavodoxins are bacterial proteins involved in several important metabolic pathways. The Sp flavodoxin (Spfld) gene was recently reported to be essential for the establishment of meningitis in a rat model, which makes SpFld a potential drug target. To facilitate future pharmacological studies, we have cloned and expressed SpFld in E. coli and we have performed an extensive structural and biochemical characterization of both the apo form and its active complex with the FMN cofactor. SpFld is a short-chain flavodoxin containing 146 residues. Unlike the well-characterized long-chain apoflavodoxins, the Sp apoprotein displays a simple two-state thermal unfolding equilibrium and binds FMN with moderate affinity. The X-ray structures of the apo and holo forms of SpFld differ at the FMN binding site, where substantial rearrangement of residues at the 91-100 loop occurs to permit cofactor binding. This work will set up the basis for future studies aiming at discovering new potential drugs to treat S. pneumoniae diseases through the inhibition of SpFld.

Idioma: Inglés

DOI: 10.1371/journal.pone.0161020

Año: 2016

Publicado en: PloS one 11, 9 (2016), 0161020 [25pp]
ISSN: 1932-6203

Factor impacto JCR: 2.806 (2016)

Categ. JCR: MULTIDISCIPLINARY SCIENCES rank: 15 / 63 = 0.238 (2016) - Q1 - T1

Factor impacto SCIMAGO: 1.236 - Agricultural and Biological Sciences (miscellaneous) (Q1) - Medicine (miscellaneous) (Q1) - Biochemistry, Genetics and Molecular Biology (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/B89
Financiación: info:eu-repo/grantAgreement/EC/FP7/283570/EU/Transnational access and enhancement of integrated Biological Structure determination at synchrotron X-ray radiation facilities/BIOSTRUCT-X
Financiación: info:eu-repo/grantAgreement/ES/MICINN/BFU2010-16297
Financiación: info:eu-repo/grantAgreement/ES/MICINN/BFU2010-19504
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CTQ2013-44367-C2-2-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/BFU2013-47064-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/BIO2014-57314-REDT

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)