Unravelling the Phosphorylation Landscape of Anthrax Toxin Receptor 1: Mechanisms and Functional Insights Through...

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Anthrax Toxin Receptor 1 (ANTXR1) is a transmembrane protein implicated in angiogenesis, cell adhesion, and migration.
• ANTXR1 serves as a receptor for Bacillus anthracis toxins and Seneca Valley virus, influencing tumor progression.
• The phosphoproteomic landscape of ANTXR1 is largely unexplored, limiting understanding of its regulatory mechanisms.

Purpose of the Study:

• To comprehensively map the phosphoproteomic landscape of ANTXR1.
• To identify conserved phosphorylation sites and their associated upstream kinases and interactors.
• To elucidate the regulatory networks modulated by ANTXR1 phosphorylation, particularly in cell migration.

Main Methods:

• Utilized a unique data integration strategy for mass spectrometry-based phosphoproteomics.
• Performed robust statistical analyses to identify conserved phosphorylation events.
• Employed computational approaches to link phosphorylation events to upstream kinases and protein interactors.

Main Results:

• Identified conserved phosphorylation events on ANTXR1 across diverse experimental conditions.
• Revealed extensive regulatory networks through co-regulated phosphorylation events of ANTXR1 and adjunct proteins.
• Discovered a phosphorylation-dependent interaction between ANTXR1 and Filamin A (FLNA), including upstream kinases and phosphobinding motifs.

Conclusions:

• The study provides a detailed phosphoproteomic map of ANTXR1.
• Findings highlight the collective role of ANTXR1 and FLNA in cell migration through phosphorylation-dependent interactions.
• The work enhances integrative analysis of phosphoproteomics data using bioinformatics and statistical methods.