Candida albicans is a leading human fungal pathogen that causes lifethreatening systemic infections, especially in immunocompromised individuals. Targeting the Hsp90 chaperone protein provides a powerful therapeutic strategy for fungal disease. However, clinical utility depends upon identifying components of the Hsp90 network that can be selectively targeted in the pathogen without harming the infected host. A combination of proteomic and chemical genomic approaches will provide the first global analysis of the Hsp90 chaperone network in C. albicans. This will test the hypothesis that Hsp90 and its co-chaperones interact with different client proteins under specific environmental conditions, enabling a range of adaptive responses that allow for virulence. Since Hsp90 is a central hub for protein homeostasis, the proposed research will identify Hsp90 interactors with important roles in stress response, drug resistance, morphogenesis, and virulence. These interactors will be prioritized based on: 1) identification in multiple screens; 2) magnitude and reproducibility of the genetic interaction or mutant phenotype; and 3) novelty of the interaction. All physical interactions will be validated by reciprocal co-immunoprecipitation, and all genetic interactions or morphogenetic defects will be validated by complementation with the wild-type allele. Epistasis analysis will determine the structure of the Hsp90 genetic network. Finally, the candidate targets will be evaluated for their role in virulence. This work will reveal novel targets for antifungal therapeutics and illuminate the mechanisms by which one of the most ancient and conserved cellular regulators governs fungal biology and disease.

Public Health Relevance

Due to the rise in the prevalence of immunocompromised and hospitalized patients, there is an increasing population of individuals that are highly susceptible to invasive infections by fungal pathogens. The major cause of nosocomial fungal infections is Candida albicans, and Hsp90-mediated processes are vital in allowing C. albicans to cause disease. By identifying Hsp90 interacting proteins in C. albicans, we will determine mechanisms for C. albicans pathogenesis and define a novel set of potential drug targets.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
1F32AI115947-01X1
Application #
9000439
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Duncan, Rory A
Project Start
2015-02-03
Project End
2018-02-02
Budget Start
2015-02-03
Budget End
2016-02-02
Support Year
1
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Toronto
Department
Type
DUNS #
259999779
City
Toronto
State
ON
Country
Canada
Zip Code
M5 1S8
Maxson, Michelle E; Naj, Xenia; O'Meara, Teresa R et al. (2018) Integrin-based diffusion barrier separates membrane domains enabling the formation of microbiostatic frustrated phagosomes. Elife 7:
O'Meara, Teresa R; Duah, Kwamaa; Guo, Cynthia X et al. (2018) High-Throughput Screening Identifies Genes Required for Candida albicans Induction of Macrophage Pyroptosis. MBio 9:
O'Meara, Teresa R; Robbins, Nicole; Cowen, Leah E (2017) The Hsp90 Chaperone Network Modulates Candida Virulence Traits. Trends Microbiol 25:809-819
Li, Xinliu; Robbins, Nicole; O'Meara, Teresa R et al. (2017) Extensive functional redundancy in the regulation of Candida albicans drug resistance and morphogenesis by lysine deacetylases Hos2, Hda1, Rpd3 and Rpd31. Mol Microbiol 103:635-656
Xie, Jinglin L; O'Meara, Teresa R; Polvi, Elizabeth J et al. (2017) Staurosporine Induces Filamentation in the Human Fungal Pathogen Candida albicans via Signaling through Cyr1 and Protein Kinase A. mSphere 2:
O'Meara, Teresa R; Veri, Amanda O; Polvi, Elizabeth J et al. (2016) Mapping the Hsp90 Genetic Network Reveals Ergosterol Biosynthesis and Phosphatidylinositol-4-Kinase Signaling as Core Circuitry Governing Cellular Stress. PLoS Genet 12:e1006142
O'Meara, Teresa R; Veri, Amanda O; Ketela, Troy et al. (2015) Global analysis of fungal morphology exposes mechanisms of host cell escape. Nat Commun 6:6741