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Mass spectrometry-based methods for phosphorylation site mapping of hyperphosphorylated proteins applied to Net1, a regulator of exit from mitosis in yeast.
Loughrey Chen S, Huddleston MJ, Shou W, Deshaies RJ, Annan RS, Carr SA.
Mol Cell Proteomics. 2002 Mar;1(3):186-96


Analysis of protein phosphorylation on a proteome-scale
Mark O. Collins, Dr. *, Lu Yu, Jyoti S. Choudhary
PROTEOMICS£¬ Volume 7 Issue 16, Pages 2751 - 2768


Proteomic analysis of tyrosine phosphorylation during human liver
transplantation
Proteome Science 2007, 5:1doi:10.1186/1477-5956-5-1
http://www.proteomesci.com/content/5/1/1


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Profiling the Global Tyrosine Phosphorylation State

Kazuya Machida, Bruce J. Mayer, and Peter Nollau
Mol Cell Proteomics 2003: 215¨C233 First Published on May 17, 2003 doi:10.1074/mcp.R300002-MCP200

Protein tyrosine kinases and protein tyrosine phosphatases play a key role in cell signaling, and the recent success of specific tyrosine kinase inhibitors in cancer treatment strongly validates the clinical relevance of basic research on tyrosine phosphorylation. Functional profiling of the tyrosine phosphoproteome is likely to lead to the identification of novel targets for drug discovery and provide a basis for novel molecular diagnostic approaches. The ultimate aim of current mass spectrometry-based phosphoproteomic approaches is the comprehensive characterization of the phosphoproteome. However, current methods are not yet sensitive enough for routine detection of a large percentage of tyrosine-phosphorylated proteins, which are generally of low abundance. In this article, we discuss alternative methods that exploit Src homology 2 (SH2) domains for profiling the tyrosine phosphoproteome. SH2 domains are small protein modules that bind specifically to tyrosine-phosphorylated peptides; there are more than 100 SH2 domains in the human genome, and different SH2 domains bind to different classes of tyrosine-phosphorylated ligands. These domains play a critical role in the propagation of signals in the cell, mediating the relocalization and complex formation of proteins in response to changes in tyrosine phosphorylation. We have developed an SH2 profiling method based on far-Western blotting, in which a battery of SH2 domains is used to probe the global state of tyrosine phosphorylation. Application to the classification of human malignancies suggests that this approach has potential as a molecular diagnostic tool. We also describe ongoing efforts to modify and improve SH2 profiling, including the development of a multiplexed assay system that will allow high-throughput functional profiling of the tyrosine phosphoproteome.
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