Abstract:
:This protocol describes an efficient method to site-specifically label cell-surface or purified proteins with chemical probes in two steps: probe incorporation mediated by enzymes (PRIME) followed by chelation-assisted copper-catalyzed azide-alkyne cycloaddition (CuAAC). In the PRIME step, Escherichia coli lipoic acid ligase (LplA) site-specifically attaches a picolyl azide (pAz) derivative to a 13-aa recognition sequence that has been genetically fused onto the protein of interest. Proteins bearing pAz are chemoselectively derivatized with an alkyne-probe conjugate by chelation-assisted CuAAC in the second step. We describe herein the optimized protocols to synthesize pAz to perform PRIME labeling and to achieve CuAAC derivatization of pAz on live cells, fixed cells and purified proteins. Reagent preparations, including synthesis of pAz probes and expression of LplA, take 12 d, whereas the procedure for performing site-specific pAz ligation and CuAAC on cells or on purified proteins takes 40 min-3 h.
journal_name
Nat Protocjournal_title
Nature protocolsauthors
Uttamapinant C,Sanchez MI,Liu DS,Yao JZ,Ting AYdoi
10.1038/nprot.2013.096subject
Has Abstractpub_date
2013-08-01 00:00:00pages
1620-34issue
8eissn
1754-2189issn
1750-2799pii
nprot.2013.096journal_volume
8pub_type
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