Repositori URV

Autor según el artículo: Gsaller F; Hortschansky P; Furukawa T; Carr PD; Rash B; Capilla J; Müller C; Bracher F; Bowyer P; Haas H; Brakhage AA; Bromley MJ

Departamento: Ciències Mèdiques Bàsiques

Autor/es de la URV: Capilla Luque, Javier

Palabras clave: Pyrrole derivative Cell extract Ccaat binding factor

Resumen: Azole drugs selectively target fungal sterol biosynthesis and are critical to our antifungal therapeutic arsenal. However, resistance to this class of drugs, particularly in the major human mould pathogen Aspergillus fumigatus, is emerging and reaching levels that have prompted some to suggest that there is a realistic probability that they will be lost for clinical use. The dominating class of pan-azole resistant isolates is characterized by the presence of a tandem repeat of at least 34 bases (TR34) within the promoter of cyp51A, the gene encoding the azole drug target sterol C14-demethylase. Here we demonstrate that the repeat sequence in TR34 is bound by both the sterol regulatory element binding protein (SREBP) SrbA, and the CCAAT binding complex (CBC). We show that the CBC acts complementary to SrbA as a negative regulator of ergosterol biosynthesis and show that lack of CBC activity results in increased sterol levels via transcriptional derepression of multiple ergosterol biosynthetic genes including those coding for HMG-CoA-synthase, HMG-CoA-reductase and sterol C14-demethylase. In agreement with these findings, inactivation of the CBC increased tolerance to different classes of drugs targeting ergosterol biosynthesis including the azoles, allylamines (terbinafine) and statins (simvastatin). We reveal that a clinically relevant mutation in HapE (P88L) significantly impairs the binding affinity of the CBC to its target site. We identify that the mechanism underpinning TR34 driven overexpression of cyp51A results from duplication of SrbA but not CBC binding sites and show that deletion of the 34 mer results in lack of cyp51A expression and increased azole susceptibility similar to a cyp51A null mutant. Finally we show that strains lacking a functional CBC are severely attenuated for pathogenicity in a pulmonary and systemic model of aspergillosis.

Áreas temáticas: Virology Parasitology Molecular biology Microbiology Medicina veterinaria Medicina iii Medicina ii Medicina i Materiais Interdisciplinar Immunology Genetics Farmacia Engenharias iii Enfermagem Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências agrárias i Ciência da computação Biotecnología Biodiversidade

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 15537366

Direcció de correo del autor: javier.capilla@urv.cat

Identificador del autor: 0000-0002-0765-6403

Fecha de alta del registro: 2024-09-07

Versión del articulo depositado: info:eu-repo/semantics/publishedVersion

Enlace a la fuente original: https://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1005775

URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/

Referencia al articulo segun fuente origial: Plos Pathogens. 12 (7): e1005775-

Referencia de l'ítem segons les normes APA: Gsaller F; Hortschansky P; Furukawa T; Carr PD; Rash B; Capilla J; Müller C; Bracher F; Bowyer P; Haas H; Brakhage AA; Bromley MJ (2016). Sterol Biosynthesis and Azole Tolerance Is Governed by the Opposing Actions of SrbA and the CCAAT Binding Complex. Plos Pathogens, 12(7), e1005775-. DOI: 10.1371/journal.ppat.1005775

DOI del artículo: 10.1371/journal.ppat.1005775

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2016

Tipo de publicación: Journal Publications