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Updated: Sep 22, 2025
Quantitative Phosphoproteomics in Fatty Acid Stimulated Saccharomyces cerevisiae
Published on: October 12, 2009
Phosphoproteomic Sample Preparation for Global Phosphorylation Profiling of a Fungal Pathogen
Brianna Ball1, Jonathan R Krieger2, Jennifer Geddes-McAlister3
1Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, Canada.
Abstract:
Phosphorylation is a key post-translational modification central to the biological behavior of proteins. This reversible modification specifically regulates cell signaling mechanisms to control survival and growth. Moreover, microbial pathogens, including both fungi and bacteria, rely on this modification to coordinate protein production and functioning during infection and dissemination within a host. Understanding phosphorylation and its involvement with effector proteins and complex networks are now possible with the recent technological advancements of mass spectrometry. Herein, we describe a phosphopeptide enrichment strategy optimized for the invasive mycosis-causing fungal pathogen Cryptococcus neoformans. Our protocol details proper sample preparation for efficient lysis and protein extraction with minimal phosphorylation losses followed by outlined steps for enrichment, instrumentation handling, and data analysis to permit deep profiling of the global phosphoproteome. The high-throughput versatility of bottom-up proteomics combined with our sample preparation approach facilitates opportunities for in-depth phosphorylation mapping and novel biological discoveries.
Insights
This study presents a new phosphopeptide enrichment strategy for Cryptococcus neoformans, enabling deep profiling of the fungal phosphoproteome. This method aids in understanding phosphorylation
Area of Science:
- Molecular Biology
- Biochemistry
- Proteomics
Background:
- Phosphorylation is a crucial post-translational modification regulating protein function in cell signaling, survival, and growth.
- Microbial pathogens utilize phosphorylation to manage protein activity during host infection and dissemination.
- Advancements in mass spectrometry facilitate the study of phosphorylation in complex biological systems.
Purpose of the Study:
- To develop and optimize a phosphopeptide enrichment strategy for the fungal pathogen Cryptococcus neoformans.
- To enable deep profiling of the global phosphoproteome in C. neoformans.
- To facilitate novel discoveries in fungal phosphorylation and host-pathogen interactions.
Main Methods:
- Optimized sample preparation for efficient lysis and protein extraction, minimizing phosphorylation loss.
- Detailed protocol for phosphopeptide enrichment, instrumentation handling, and data analysis.
- Application of bottom-up proteomics for high-throughput phosphoproteome analysis.
Main Results:
- Successful implementation of a phosphopeptide enrichment strategy for C. neoformans.
- Facilitation of deep profiling of the global phosphoproteome.
- Demonstration of the protocol's versatility for in-depth phosphorylation mapping.
Conclusions:
- The developed protocol provides a robust method for studying phosphorylation in C. neoformans.
- This approach enhances our understanding of fungal pathogenesis and host-pathogen interactions.
- The strategy opens avenues for novel biological discoveries in fungal phosphoproteomics.
