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Published on: November 8, 2006
Distinct STRIPAK subunits drive conserved and subunit-specific signaling programs in Cryptococcus neoformans
Patricia P Peterson1, Sarah Croog1, Yeseul Choi1
1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA.
Mbio
|August 13, 2026
Summary
The STRIPAK complex coordinates fungal virulence and genome stability in Cryptococcus neoformans. Core subunit loss impairs growth and virulence, while Mob3 deletion enhances it, revealing subunit-specific roles in host-pathogen interactions.
Area of Science:
- Mycology and Pathogenesis
- Molecular and Cell Biology
- Genetics and Genomics
Background:
- The striatin-interacting phosphatase and kinase (STRIPAK) complex is a conserved signaling hub regulating diverse cellular processes.
- Its role in human fungal pathogens, particularly in coordinating virulence and host adaptation, remains largely undefined.
- Cryptococcus neoformans, an opportunistic fungal pathogen, requires precise signaling for survival and pathogenesis within the host.
Purpose of the Study:
- To dissect the functions of the STRIPAK complex and its individual subunits in the opportunistic fungal pathogen Cryptococcus neoformans.
- To investigate the roles of STRIPAK in fungal growth, stress adaptation, cell cycle progression, morphogenesis, genome stability, and virulence.
- To elucidate the signaling pathways regulated by STRIPAK and its subunits using phosphoproteomic analyses.
Main Methods:
- Genetic analyses of STRIPAK subunit mutants (PPH22, FAR8, FAR9, FAR11, MOB3) in Cryptococcus neoformans.
- Phenotypic characterization including growth, stress adaptation, cell cycle, morphogenesis, and virulence assays in murine models.
- Genomic analyses for aneuploidy and instability, and phosphoproteomic profiling to identify signaling pathway alterations.
Main Results:
- Loss of core STRIPAK components (PPH22, FAR8, FAR9, FAR11) resulted in severe defects in growth, stress adaptation, cell cycle, and morphogenesis, alongside genome instability.
- FAR11 deletion led to avirulence, while FAR9 deletion caused delayed fatal disease with host-associated genome remodeling (chromosome 11 amplification).
- MOB3 deletion resulted in a hypervirulent phenotype, characterized by enhanced transmigration, macrophage survival, and increased dissemination via small-cell morphotypes.
Conclusions:
- The STRIPAK complex is a critical coordinator of genome stability, morphological plasticity, stress adaptation, and virulence in Cryptococcus neoformans.
- Individual STRIPAK subunits exhibit both shared and distinct functions, driving divergent signaling outputs that shape host-pathogen interactions.
- STRIPAK represents a central signaling hub and a potential target for antifungal intervention strategies.
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