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Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
Sensitive kinase assay linked with phosphoproteomics for identifying direct kinase substrates
Liang Xue1, Wen-Horng Wang, Anton Iliuk
1Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA.
Summary
This study introduces a new proteomic method to find direct protein kinase substrates. The method identified spleen tyrosine kinase (Syk) substrates in B cells and breast cancer cells, revealing its role in cell division.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Identifying direct protein kinase substrates is crucial for understanding disease mechanisms.
- Protein kinases play key roles in cellular signaling pathways and disease pathologies.
- Spleen tyrosine kinase (Syk) is a protein-tyrosine kinase implicated in both oncogenesis and tumor suppression.
Purpose of the Study:
- To develop and validate an integrated proteomic strategy for identifying direct protein kinase substrates.
- To apply this strategy to discover novel substrates of spleen tyrosine kinase (Syk).
Main Methods:
- Developed a 'kinase assay linked with phosphoproteomics' strategy.
- Combined in vitro kinase reactions with endogenous phosphoproteomics.
- Utilized mass spectrometry for identification of phosphorylated peptides.
Main Results:
- Identified 64 direct Syk substrates in B cells and 23 in breast cancer cells.
- Discovered known and novel Syk substrates, including centrosomal substrates.
- Provided evidence for Syk's negative regulation of cell division via centrosomal activity.
Conclusions:
- The developed proteomic strategy is effective for identifying direct protein kinase substrates.
- Syk has distinct substrate profiles in different cell types, impacting cell division.
- Syk's centrosomal kinase activity represents a novel mechanism regulating cell division.
