Cited by 36Fungal Infections and StudiesFungal and yeast genetics researchPI3K/AKT/mTOR signaling in cancer

The TOR Pathway Plays Pleiotropic Roles in Growth and Stress Responses of the Fungal Pathogen Cryptococcus neoformans

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So, Yee-Seul, Lee, Dong-Gi, Idnurm, Alexander, Ianiri, Giuseppe, Bahn, Yong-Sun·2019·Genetics

Abstract

The target of rapamycin (TOR) pathway is an evolutionarily conserved signal transduction system that governs a plethora of eukaryotic biological processes, but its role in Cryptococcus neoformans remains elusive. In this study, we investigated the TOR pathway by functionally characterizing two Tor-like kinases, Tor1 and Tlk1, in C. neoformans. We successfully deleted TLK1, but not TOR1. TLK1 deletion did not result in any evident in vitro phenotypes, suggesting that Tlk1 is dispensable for the growth of C. neoformans. We demonstrated that Tor1, but not Tlk1, is essential and the target of rapamycin by constructing and analyzing conditionally regulated strains and sporulation analysis of heterozygous mutants in the diploid strain background. To further analyze the Tor1 function, we constructed constitutive TOR1 overexpression strains. Tor1 negatively regulated thermotolerance and the DNA damage response, which are two important virulence factors of C. neoformans. TOR1 overexpression reduced Mpk1 phosphorylation, which is required for cell wall integrity and thermoresistance, and Rad53 phosphorylation, which governs the DNA damage response pathway. Tor1 is localized to the cytoplasm, but enriched in the vacuole membrane. Phosphoproteomics and transcriptomics revealed that Tor1 regulates a variety of biological processes, including metabolic processes, cytoskeleton organization, ribosome biogenesis, and stress response. TOR inhibition by rapamycin caused actin depolarization in a Tor1-dependent manner. Finally, screening rapamycin-sensitive and -resistant kinase and transcription factor mutants revealed that the TOR pathway may crosstalk with a number of stress signaling pathways. In conclusion, our study demonstrates that a single Tor1 kinase plays pleiotropic roles in C. neoformans.

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Crossref · 10.1534/genetics.119.302191

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  • Evidence exists for divergence in regulation of TOR signalling in C. neoformans and other fungi.

    “However, evidence exists for divergence in regulation of TOR signalling in C. neoformans and other fungi85, which would have important implications for the development of a broad-spectrum antifungal therapeutic.”

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Authors
So, Y.-S., Lee, D.-G., Idnurm, A., Ianiri, G., & Bahn, Y.-S.
Affiliations
  • Yonsei University (KR)
  • The University of Melbourne (AU)
  • Duke Medical Center (US)
Corresponding author
Bahn, Yong-Sun
Venue
Genetics
Published
2019-06-07
Volume
212
Issue
4
Pages
1241-1258
ISSN
  • 0016-6731 (ISSN-L)
  • 1943-2631
OpenAlex
W2948105229
Cited by
36
References
54
Citations by year
2026: 6 · 2025: 5 · 2024: 7 · 2023: 3 · 2022: 5 · 2021: 7 · 2020: 3
FWCI
2.85
Type
journal article
Language
en
Open access
Locations
  • Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca - Università degli Studi del Molise (submittedVersion)
Funders
National Institute of Allergy and Infectious Diseases (R21AI094364)
Topics
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
TOR signaling, Cryptococcus neoformans, heat tolerance, DNA damage response, Rad53 phosphorylation, cell wall integrity, virulence factors, rapamycin sensitivity
MeSH terms
Thermotolerance, Mechanistic Target of Rapamycin Complex 1, Cryptococcus neoformans, Cytoskeleton, Fungal Proteins, Ribosomes, Spores, Fungal, Signal Transduction, Genetic Pleiotropy

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