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Updated: Jul 17, 2026
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Isolation of Whole Cell Protein Lysates from Mouse Facial Processes and Cultured Palatal Mesenchyme Cells for Phosphoprotein Analysis
Published on: April 1, 2022
Large-scale phosphorylation analysis of mouse liver.
Judit Villén1, Sean A Beausoleil, Scott A Gerber
1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Summary
Researchers developed an integrated platform to analyze the mouse liver phosphoproteome, identifying over 5,600 phosphorylation sites and novel kinase motifs. This advance aids understanding of cellular signaling networks.
Area of Science:
- Molecular Biology
- Proteomics
- Cellular Signaling
Background:
- Protein phosphorylation is crucial for cellular processes but challenging to study comprehensively.
- Existing technical limitations hinder high-throughput analysis of phosphorylated proteins.
- A deeper understanding of the phosphoproteome is needed to elucidate complex cellular networks.
Purpose of the Study:
- To develop and validate an integrated analytical platform for comprehensive phosphoproteome surveying.
- To identify and characterize phosphorylation sites and associated kinase motifs in mouse liver.
- To investigate patterns in phosphorylation site distribution and potential regulatory mechanisms.
Main Methods:
- Employed tandem phosphopeptide enrichment techniques.
- Utilized high-performance mass spectrometry (MS).
- Implemented optimized database search and data filtering strategies for analysis.
Main Results:
- Identified 5,635 nonredundant phosphorylation sites across 2,328 mouse liver proteins.
- Discovered novel and known kinase motifs, including a unique 'dipolar' motif.
- Observed higher frequency of C-terminal phosphorylation and unique kinase distributions; identified potential ordered phosphorylation motifs.
Conclusions:
- The integrated analytical platform is a powerful tool for phosphoproteome analysis.
- The study provides a rich dataset of mouse liver phosphorylation sites and motifs.
- Findings offer insights into kinase specificity, phosphorylation site localization, and potential regulatory mechanisms.
