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Phosphoproteome of Cryptococcus neoformans.

Lakshmi Dhevi N Selvan¹, Santosh Renuse¹, Jyothi Embekkat Kaviyil²

¹Institute of Bioinformatics, International Technology Park, Bangalore 560 066, India; Amrita School of Biotechnology, Amrita University, Kollam 690 525, India.

Journal of Proteomics

|July 16, 2013

Summary

This study profiled phosphoproteins in Cryptococcus neoformans, identifying key phosphorylation sites and kinases involved in virulence. Understanding these phosphoproteins offers insights into the molecular mechanisms of cryptococcal meningitis pathogenesis.

Keywords:

Basic pH reversed-phase liquid chromatography.CID Collision induced dissociation ETD Electron transfer dissociation Fungal infection Metal oxide affinity chromatography Stress response TiO(2)Titanium dioxide bRPLC

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Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

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Area of Science:

Mycology
Proteomics
Molecular Biology

Background:

Cryptococcus neoformans is an encapsulated yeast causing life-threatening meningitis, particularly in immunocompromised individuals.
The yeast's capsule and melanin are critical virulence factors, with their expression linked to cAMP-dependent protein kinase A (PKA)-induced phosphorylation.
Phosphoproteins are crucial for understanding the molecular regulation of C. neoformans virulence and infection.

Purpose of the Study:

To perform a global phosphoproteome profiling of C. neoformans var. grubii.
To identify key phosphoproteins and active kinases involved in the regulation of virulence traits.
To provide a framework for understanding virulence mechanisms within signaling pathways.

Main Methods:

Global phosphoproteome profiling of C. neoformans var. grubii.
High-resolution mass spectrometry of TiO2-enriched phosphopeptides.
Motif enrichment analysis to identify kinase substrates.

Main Results:

Identification of 1089 phosphopeptides from 648 proteins, including approximately 45 kinases.
Motif enrichment analysis indicated that cyclin-dependent kinase (CDK) family substrates were predominantly phosphorylated.
This suggests active roles for CDKs in C. neoformans during in vitro culture.

Conclusions:

The study identified 1540 phosphorylation sites across 648 proteins, offering a comprehensive view of the phosphoproteome.
Kinase-mediated signaling pathways are implicated in the biosynthesis of C. neoformans virulence factors like melanin and capsule.
This resource aids in exploring activated signaling pathways and their association with C. neoformans virulence and pathogenesis.