N-glycosylation of the protein disulfide isomerase Pdi1 ensures full Ustilago maydis virulence

Autoři: Miriam Marín-Menguiano aff001;  Ismael Moreno-Sánchez aff001;  Ramón R. Barrales aff001;  Alfonso Fernández-Álvarez aff001;  José Ignacio Ibeas aff001
Působiště autorů: Centro Andaluz de Biología del Desarrollo (CABD), Universidad Pablo de Olavide-Consejo Superior de Investigaciones Científicas-Junta de Andalucía, Ctra. Utrera km.1, Seville, Spain aff001
Vyšlo v časopise: N-glycosylation of the protein disulfide isomerase Pdi1 ensures full Ustilago maydis virulence. PLoS Pathog 15(11): e32767. doi:10.1371/journal.ppat.1007687
Kategorie: Research Article
doi: 10.1371/journal.ppat.1007687


Fungal pathogenesis depends on accurate secretion and location of virulence factors which drive host colonization. Protein glycosylation is a common posttranslational modification of cell wall components and other secreted factors, typically required for correct protein localization, secretion and function. Thus, the absence of glycosylation is associated with animal and plant pathogen avirulence. While the relevance of protein glycosylation for pathogenesis has been well established, the main glycoproteins responsible for the loss of virulence observed in glycosylation-defective fungi have not been identified. Here, we devise a proteomics approach to identify such proteins and use it to demonstrate a role for the highly conserved protein disulfide isomerase Pdi1 in virulence. We show that efficient Pdi1 N-glycosylation, which promotes folding into the correct protein conformation, is required for full pathogenic development of the corn smut fungus Ustilago maydis. Remarkably, the observed virulence defects are reminiscent of those seen in glycosylation-defective cells suggesting that the N-glycosylation of Pdi1 is necessary for the full secretion of virulence factors. All these observations, together with the fact that Pdi1 protein and RNA expression levels rise upon virulence program induction, suggest that Pdi1 glycosylation is important for normal pathogenic development in U. maydis. Our results provide new insights into the role of glycosylation in fungal pathogenesis.

Klíčová slova:

Glycoproteins – Glycosylation – Maize – Plant cell walls – Plant fungal pathogens – Plant pathogens – Virulence factors – Ustilago maydis


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