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Updated: Aug 8, 2026

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Oligopeptide Competition Assay for Phosphorylation Site Determination
Published on: May 18, 2017
Quantitative methods for the analysis of protein phosphorylation in drug development
1Research & Development, LI-COR Biosciences, 4308 Progressive Ave., Lincoln, NE 68504, USA. molive@licor.com
Expert Review of Proteomics
|June 22, 2005
Summary
Protein kinases regulate cell signaling and are key in cancer. This review covers methods for quantifying kinase function to develop targeted cancer therapies.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Protein kinases are crucial mediators of signal transduction and cell signaling pathways.
- These enzymes play significant roles in the development and progression of neoplasia, including cancer.
- Targeting protein kinases with specific inhibitors offers a promising strategy for cancer chemotherapeutics.
Purpose of the Study:
- To review current quantitative methods for analyzing protein phosphorylation.
- To assess the utility of these methods in evaluating kinase inhibitors for drug development.
- To identify potential protein kinase targets for cancer therapy.
Main Methods:
- The review examines various current formats for quantifying protein kinase activity.
- Methods focus on the analysis of protein phosphorylation as a readout of kinase function.
- The discussion includes applications relevant to drug discovery and development.
Main Results:
- Several quantitative formats exist for measuring protein kinase activity.
- These methods are essential for identifying therapeutic targets and evaluating drug efficacy.
- The development of specific kinase inhibitors is advancing cancer treatment strategies.
Conclusions:
- Quantitative analysis of protein phosphorylation is vital for understanding kinase function.
- Kinase inhibitors represent a significant class of targeted cancer therapeutics.
- Continued development of analytical methods will accelerate the discovery of novel kinase-targeted drugs.
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Phosphorylation
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During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
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