Tpc1 is an important Zn(II)(2)Cys(6) transcriptional regulator required for polarized growth and virulence in the rice blast fungus

Galhano, Rita, Illana, Adriana, Ryder, Lauren S., Rodriguez-Romero, Julio, Demuez, Marie, Badaruddin, Muhammad, Martinez-Rocha, Ana Lilia, Soanes, Darren M., Studholme, David J., Talbot, Nicholas J. ORCID: and Sesma, Ane ORCID: (2017) Tpc1 is an important Zn(II)(2)Cys(6) transcriptional regulator required for polarized growth and virulence in the rice blast fungus. PLoS Pathogens, 13 (7). ISSN 1553-7366

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The establishment of polarity is a critical process in pathogenic fungi, mediating infection-related morphogenesis and host tissue invasion. Here, we report the identification of TPC1 (Transcription factor for Polarity Control 1), which regulates invasive polarized growth in the rice blast fungus Magnaporthe oryzae. TPC1 encodes a putative transcription factor of the fungal Zn(II)(2)Cys(6) family, exclusive to filamentous fungi. Tpc1-deficient mutants show severe defects in conidiogenesis, infection-associated autophagy, glycogen and lipid metabolism, and plant tissue colonisation. By tracking actin-binding proteins, septin-5 and autophagosome components, we show that Tpc1 regulates cytoskeletal dynamics and infection-associated autophagy during appressorium-mediated plant penetration. We found that Tpc1 interacts with Mst12 and modulates its DNA-binding activity, while Tpc1 nuclear localisation also depends on the MAP kinase Pmk1, consistent with the involvement of Tpc1 in this signalling pathway, which is critical for appressorium development. Importantly, Tpc1 directly regulates NOXD expression, the p22(phox) subunit of the fungal NADPH oxidase complex via an interaction with Mst12. Tpc1 therefore controls spatial and temporal regulation of cortical F-actin through regulation of the NADPH oxidase complex during appressorium re-polarisation. Consequently, Tpc1 is a core developmental regulator in filamentous fungi, linking the regulated synthesis of reactive oxygen species and the Pmk1 pathway, with polarity control during host invasion.

Item Type: Article
Uncontrolled Keywords: plant-pathogenic fungus,magnaporthe-oryzae,nadph oxidase,dna-binding,map kinase,saccharomyces-cerevisiae,sordaria-macrospora,neurospora-crassa,turgor generation,filamentous fungi
Faculty \ School: Faculty of Science > The Sainsbury Laboratory
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Depositing User: LivePure Connector
Date Deposited: 15 Feb 2019 10:30
Last Modified: 22 Oct 2022 04:28
DOI: 10.1371/journal.ppat.1006516


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