Mycobiology.  2018 Jun;46(2):114-121. 10.1080/12298093.2018.1468053.

Mon1 Is Essential for Fungal Virulence and Stress Survival in Cryptococcus neoformans

Affiliations
  • 1School of Food Science and Biotechnology, Institute of Agricultural Science and Technology, Kyungpook National University, Daegu, Republic of Korea. phsoo97@knu.ac.kr
  • 2School of Life Science, Handong Global University, Pohang, Republic of Korea.
  • 3Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA.

Abstract

Mon1 is a guanine nucleotide exchange factor subunit that activates the Ypt7 Rab GTPase and is essential for vacuole trafficking and autophagy in eukaryotic organisms. Here, we identified and characterized the function of Mon1, an ortholog of Saccharomyces cerevisiae Mon1, in a human fungal pathogen, Cryptococcus neoformans. Mutation in mon1 resulted in hypersensitivity to thermal stress. The mon1 deletion mutant exhibited increased sensitivity to cell wall and endoplasmic reticulum stress. However, the mon1 deletion mutant showed more resistance to the antifungal agent fluconazole. In vivo studies demonstrated that compared to the wild-type strain, the mon1 deletion mutant attenuated virulence in the Galleria mellonella insect model. Moreover, the mon1 deletion mutant was avirulent in the murine inhalation model. These results demonstrate that Mon1 plays a crucial role in stress survival and pathogenicity in C. neoformans.

Keyword

Cryptococcus neoformans; Mon1; virulence

MeSH Terms

Autophagy
Cell Wall
Cryptococcus neoformans*
Cryptococcus*
Endoplasmic Reticulum Stress
Fluconazole
GTP Phosphohydrolases
Guanine Nucleotide Exchange Factors
Humans
Hypersensitivity
Inhalation
Insects
Saccharomyces cerevisiae
Vacuoles
Virulence*
Fluconazole
GTP Phosphohydrolases
Guanine Nucleotide Exchange Factors
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