Chemoenzymatic site-specific reversible immobilization and labeling of proteins from crude cellular extract without prior purification using oxime and hydrazine ligation

Mohammad M. Mahmoodi, Mohammad Rashidian, Jonathan K. Dozier, Mark D. Distefano

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)89-109
Number of pages21
JournalCurrent protocols in chemical biology
Volume5
Issue number2
DOIs
StatePublished - Jan 1 2013

Keywords

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

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