The functionally conserved effector Sta1 is a fungal cell wall protein required for virulence in Ustilago maydis.
Ustilago maydis
biotrophic pathogen
core effector
fungal cell wall
virulence
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
07 2020
07 2020
Historique:
received:
12
11
2019
accepted:
18
02
2020
pubmed:
1
3
2020
medline:
15
5
2021
entrez:
1
3
2020
Statut:
ppublish
Résumé
The biotrophic fungus Ustilago maydis causes the smut disease of maize. The interaction with its host and induction of characteristic tumors are governed largely by secreted effectors whose function is mostly unknown. To identify effectors with a prominent role in virulence, we used RNA sequencing and found that the gene sta1 is upregulated during early stages of infection. We characterized Sta1 by comparative genomics, reverse genetics, protein localization, stress assays, and microscopy. sta1 mutants show a dramatic reduction of virulence and show altered colonization of tissue neighboring the vascular bundles. Functional orthologues of Sta1 are found in related smut pathogens infecting monocot and dicot plants. Sta1 is secreted by budding cells but is attached to the cell wall of filamentous hyphae. Upon constitutive expression of Sta1, fungal filaments become susceptible to Congo red, β-glucanase, and chitinase, suggesting that Sta1 alters the structure of the fungal cell wall. Constitutive or delayed expression of sta1 during plant colonization negatively impacts on virulence. Our results suggest that Sta1 is a novel kind of effector, which needs to modify the hyphal cell wall to allow hyphae to be accommodated in tissue next to the vascular bundles.
Substances chimiques
Fungal Proteins
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
185-199Informations de copyright
© 2020 The Authors. New Phytologist © 2020 New Phytologist Trust.
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