UNIT 11.7 Protein Tyrosine Phosphatase Assays
Published Online: 1 APR 2011
Copyright © 2011 by John Wiley & Sons, Inc.
Lab Protocol Title
Current Protocols in Immunology
How to Cite
Lorenz, U. 2011. Protein Tyrosine Phosphatase Assays. Current Protocols in Immunology. 93:11.7:11.7.1–11.7.12.
- Published Online: 1 APR 2011
- Published Print: APR 2011
Tyrosine phosphorylation and dephosphorylation of proteins play a critical role in many processes of the immune system, from early development to fully differentiated effector function. Since the opposing actions of protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPs) determine the steady-state level of tyrosine phosphorylation on a given protein, it is often important for mechanistic studies to determine the specific activities of PTKs and PTPs. PTPs are defined by their enzymatic activity that catalyzes the dephosphorylation of phosphotyrosine residues. This unit focuses on methods to determine the enzymatic activity of PTPs. While there are many varieties of PTP assays, the focus in this unit is on immune complex PTP assays, which do not require elaborate biochemical purifications and are commonly used to test the activities of specific PTPs in the immune system. Curr. Protoc. Immunol. 93:11.7.1-11.7.12. © 2011 by John Wiley & Sons, Inc.
- protein tyrosine phosphatase;
- protein tyrosine phosphatase assay;
- malachite green assay;
- radioactively labeled;