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Related Concept Videos

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Updated: Feb 27, 2026

Utilization of Grafix for the Detection of Transient Interactors of Saccharomyces cerevisiae Spliceosome Subcomplexes
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Comparative proteomic analysis of Gib2 validating its adaptor function in Cryptococcus neoformans.

Gillian O Bruni1, Blake Battle2, Ben Kelly1

  • 1Department of Microbiology, Immunology, and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America.

Plos One
|July 8, 2017
PubMed
Summary
This summary is machine-generated.

The fungal protein Gib2 is crucial for Cryptococcus neoformans virulence, impacting growth and pathogenicity. Its disruption affects numerous proteins involved in stress response and protein translation, suggesting conserved roles in cellular processes.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Fungal Pathogenesis

Background:

  • Cryptococcus neoformans causes life-threatening meningoencephalitis in immunocompromised individuals.
  • Signal transduction pathways involving Gpa1, Ras1, and Gib2 are critical for C. neoformans virulence.
  • Gib2 acts as a scaffold protein regulating growth, differentiation, pathogenicity, and cAMP levels.

Purpose of the Study:

  • To investigate the global regulatory functions of Gib2 in C. neoformans.
  • To identify proteins affected by GIB2 disruption using proteomic analysis.
  • To elucidate the role of Gib2 in fungal stress response and virulence.

Main Methods:

  • Two-dimensional differential gel electrophoresis (DIGE) was employed to compare protein expression profiles.
  • Proteomic analysis was performed on C. neoformans strains with and without GIB2.
  • Statistical analysis, including Bonferroni correction, was used to identify significant protein expression changes.

Main Results:

  • GIB2 disruption altered the expression of 600 protein spots (43.4% increased, 56.6% decreased).
  • Significant changes were observed in 96 proteins, with 75 belonging to 12 functional groups.
  • Affected proteins included Hsp70/71 heat shock homologs and ribosomal proteins, suggesting roles in stress response and protein translation.

Conclusions:

  • Gib2 plays a multifaceted role in C. neoformans growth and pathogenicity.
  • Gib2 is involved in regulating ribosomal biogenesis and protein translation, consistent with conserved roles of Gβ-like/RACK/Gib2 proteins.
  • Gib2-mediated stress responses are linked to C. neoformans virulence, highlighting its importance in fungal pathogenesis.