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Updated: Jun 4, 2026
12:47
Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins
Published on: December 27, 2016
Tyrosine Phosphorylation Site Identification by MALDI-MS.
CSH Protocols
|March 2, 2011
Summary
This study details a method for identifying tyrosine phosphorylation sites using SDS-PAGE, in-gel digestion, and mass spectrometry. The approach successfully identified eight phosphorylation sites in human Gab-1 protein.
Area of Science:
- Biochemistry
- Proteomics
- Molecular Biology
Background:
- Protein phosphorylation is a critical regulatory mechanism in cellular signaling.
- Identifying specific phosphorylation sites is essential for understanding protein function and disease pathways.
- Current methods for phosphoproteomics can be complex and require specialized techniques.
Purpose of the Study:
- To present a robust protocol for the identification of tyrosine phosphorylation sites.
- To demonstrate the utility of the method using the human Gab-1 protein.
Main Methods:
- Radiolabeled proteins are separated by SDS-PAGE and digested in-gel.
- Phosphopeptides are analyzed using two-dimensional liquid chromatography (LC).
- Identification is performed using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) and post-source decay (PSD).
Main Results:
- The protocol successfully identified eight tyrosine phosphorylation sites in the human Gab-1 protein.
- The method was validated by examining the in vitro phosphorylation of human Gab-1 by the insulin receptor kinase.
Conclusions:
- This protocol provides an effective strategy for identifying phosphorylated tyrosine residues in proteins.
- The method is applicable to studying signaling pathways involving tyrosine kinases and their substrates.
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