UNIT 18.18 Serine/Threonine Protein Phosphatase Assays

  1. Thomas McAvoy1,
  2. Angus C. Nairn2

Published Online: 1 OCT 2010

DOI: 10.1002/0471142727.mb1818s92

Current Protocols in Molecular Biology

Current Protocols in Molecular Biology

How to Cite

McAvoy, T. and Nairn, A. C. 2010. Serine/Threonine Protein Phosphatase Assays. Current Protocols in Molecular Biology. 92:18.18:18.18.1–18.18.11.

Author Information

  1. 1

    The Rockefeller University, New York, New York

  2. 2

    Yale University School of Medicine, New Haven, Connecticut

Publication History

  1. Published Online: 1 OCT 2010
  2. Published Print: OCT 2010


Methods for assaying serine/threonine protein phosphatases are discussed. Three commonly used protocols are presented that employ either colorimetric or radiometric assays. These methods can be used to assay a variety of preparations of serine/threonine phosphatases, from crude lysates to purified proteins. Strategies for the application of a particular protocol for a particular purpose are discussed. The assays can be used in either a high-throughput mode where simple comparison of activities can be done, or in specific assays where kinetic data can be derived. Curr. Protoc. Mol. Biol. 92:18.18.1-18.18.11. © 2010 by John Wiley & Sons, Inc.


  • protein phosphorylation;
  • protein phosphatase;
  • colorimetric assay;
  • radiometric assay