Unit

Chemoenzymatic Site-Specific Reversible Immobilization and Labeling of Proteins from Crude Cellular Extract Without Prior Purification Using Oxime and Hydrazine Ligation

  1. Mohammad M. Mahmoodi1,2,
  2. Mohammad Rashidian1,2,
  3. Jonathan K. Dozier1,
  4. Mark D. Distefano1

Published Online: 1 JUN 2013

DOI: 10.1002/9780470559277.ch120247

Current Protocols in Chemical Biology

Current Protocols in Chemical Biology

How to Cite

Mahmoodi, M. M., Rashidian, M., Dozier, J. K. and Distefano, M. D. 2013. Chemoenzymatic Site-Specific Reversible Immobilization and Labeling of Proteins from Crude Cellular Extract Without Prior Purification Using Oxime and Hydrazine Ligation. Current Protocols in Chemical Biology. 5:89–109.

Author Information

  1. 1

    Department of Chemistry, University of Minnesota, Minneapolis, Minnesota

  2. 2

    These authors contributed equally to this work.

Publication History

  1. Published Online: 1 JUN 2013

Abstract

In a facile and potentially general method for protein modification at the C-terminus, aldehyde-modified proteins, obtained from enzymatic protein prenylation, react rapidly with hydrazide and aminooxy surfaces and fluorophores at neutral pH and in micromolar concentration ranges of reagents. This strategy was used for fluorescent labeling of eGFP-CVIA, as a model protein, with aminooxy and hydrazide fluorophores or PEGs, and immobilization onto and subsequent release of the protein from hydrazide-functionalized agarose beads using hydrazone-oxime exchange. This method is described in detail here and provides site-specifically PEGylated or fluorescently labeled proteins starting from crude cellular extract in three steps: prenylation, capture, and release. Curr. Protoc. Chem. Biol. 5:89-109 © 2013 by John Wiley & Sons, Inc.

Keywords:

  • PFTase;
  • farnesyl diphosphate;
  • site-specific protein modification;
  • protein immobilization;
  • oxime ligation;
  • hydrazine ligation