Regulatory mechanisms of a highly pectinolytic mutant of Penicillium occitanis and functional analysis of a candidate gene in the plant pathogen Fusarium oxysporum

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• dc.contributor.author Bravo Ruiz, Gustavoca
• dc.contributor.author Sassi, Azza Hadjca
• dc.contributor.author Marcet Houben, Marinaca
• dc.contributor.author Di Pietro, Antonioca
• dc.contributor.author Gargouri, Ali Faouzica
• dc.contributor.author Roncero, María Isabel Gonzálezca
• dc.date.accessioned 2018-05-31T07:32:22Z
• dc.date.available 2018-05-31T07:32:22Z
• dc.date.issued 2017
• dc.description.abstract Penicillium occitanis is a model system for enzymatic regulation. A mutant strain exhibiting constitutive overproduction of different pectinolytic enzymes both under inducing (pectin) or repressing conditions (glucose) was previously isolated after chemical mutagenesis. In order to identify the molecular basis of this regulatory mechanism, the genomes of the wild type and the derived mutant strain were sequenced and compared, providing the first reference genome for this species. We used a phylogenomic approach to compare P. occitanis with other pectinolytic fungi and to trace expansions of gene families involved in carbohydrate degradation. Genome comparison between wild type and mutant identified seven mutations associated with predicted proteins. The most likely candidate was a mutation in a highly conserved serine residue of a conserved fungal protein containing a GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain and a fungus-specific transcription factor regulatory middle homology region. To functionally characterize the role of this candidate gene, the mutation was recapitulated in the predicted orthologue Fusarium oxysporum, a vascular wilt pathogen which secretes a wide array of plant cell wall degrading enzymes, including polygalacturonases, pectate lyases, xylanases and proteases, all of which contribute to infection. However, neither the null mutant nor a mutant carrying the analogous point mutation exhibited a deregulation of pectinolytic enzymes. The availability, annotation and phylogenomic analysis of the P. occitanis genome sequence represents an important resource for understanding the evolution and biology of this species, and sets the basis for the discovery of new genes of biotechnological interest for the degradation of complex polysaccharides.
• dc.description.sponsorship The authors gratefully acknowledge Esther Martinez Aguilera for technical assistance. Houda Skouri-Gargouri and Hèla Trigui-Lahiani are thanked for their help and collaboration. This research was supported by Junta de Andalucía (grant CVI-7319), the Spanish Ministerio de Ciencia e Innovacion (grants BIO2013-47870 and BFU2015-67107) and Agencia Española de Cooperacion Internacional al Desarrollo (AECID-PCI-Med, AP/040009/11). GB had a postdoctoral position from Consejeria de Economia, Innovacion, Ciencia y Empresa, Junta de Andalucía.
• dc.format.mimetype application/pdf
• dc.identifier.citation Bravo-Ruiz G, Sassi AH, Marcet-Houben M, Di Pietro A, Gargouri A, Gabaldon T et al. Regulatory Mechanisms of a Highly Pectinolytic Mutant of Penicillium occitanis and Functional Analysis of a Candidate Gene in the Plant Pathogen Fusarium oxysporum. Front Microbiol. 2017 Sep 8;8:1627. DOI: 10.3389/fmicb.2017.01627
• dc.identifier.doi http://dx.doi.org/10.3389/fmicb.2017.01627
• dc.identifier.issn 1664-302X
• dc.identifier.uri http://hdl.handle.net/10230/34755
• dc.language.iso eng
• dc.publisher Frontiersca
• dc.relation.ispartof Frontiers in Microbiology. 2017 Sep 8;8:1627
• dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/BIO2013-47870
• dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/BFU2015-67107
• dc.rights © 2017 Bravo-Ruiz, Sassi, Marcet-Houben, Di Pietro, Gargouri, Gabaldon and Roncero. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (http://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.rights.uri http://creativecommons.org/licenses/by/4.0/
• dc.subject.keyword Clb-like transcription factor
• dc.subject.keyword Cellulases
• dc.subject.keyword Complex polysaccharide degradation
• dc.subject.keyword Gene regulation
• dc.subject.keyword Pectinases
• dc.title Regulatory mechanisms of a highly pectinolytic mutant of Penicillium occitanis and functional analysis of a candidate gene in the plant pathogen Fusarium oxysporumca
• dc.type info:eu-repo/semantics/article
• dc.type.version info:eu-repo/semantics/publishedVersion