UNIT 13.7 Assays of Protein Kinases Using Exogenous Substrates

  1. Nigel Carter

Published Online: 1 MAY 2001

DOI: 10.1002/0471140864.ps1307s09

Current Protocols in Protein Science

Current Protocols in Protein Science

How to Cite

Carter, N. 2001. Assays of Protein Kinases Using Exogenous Substrates. Current Protocols in Protein Science. 9:13.7:13.7.1–13.7.22.

Author Information

  1. The Salk Institute for Biological Studies, La Jolla, California

Publication History

  1. Published Online: 1 MAY 2001
  2. Published Print: SEP 1997


In studies of the regulation of specific biochemical events by reversible phosphorylation, assaying the protein kinases themselves can often lead to significant progress in understanding the mechanistic details of a system under study. This unit describes assays for a variety of protein kinases that require different conditions to detect and measure their activities--cyclic nucleotide-dependent kinases, protein kinase C and isoforms, casein kinases, Ca2+/calmodulin-dependent kinases, and tyrosine kinase. The unit is not meant to be a catalog of individual protein kinase assays; however, the general principles of these assays should apply to most if not all known protein kinases. In-gel assays for specific kinase activity are also described. Support protocols describe production of crude cell lysates as a source of enzyme activity, and methods of evaluating assays, including trichloroacetic acid (TCA) precipitation to measure incorporation of radioactivity, adsorption of the labeled material onto P81 phosphocellulose paper, or electrophoretic separation and autoradiography.