SNAP- and CLIP-tag protein labeling systems enable the specific, covalent attachment of virtually any molecule to a protein of interest. There are two steps to using this system: cloning and expression of the protein of interest as a SNAP-tag® fusion, and labeling of the fusion with the SNAP-tag substrate of choice. The SNAP-tag is a small protein based on human O6-alkylguanine-DNA-alkyltransferase (hAGT), a DNA repair protein. SNAP-tag substrates are dyes, fluorophores, biotin, or beads conjugated to guanine or chloropyrimidine leaving groups via a benzyl linker. In the labeling reaction, the substituted benzyl group of the substrate is covalently attached to the SNAP-tag. CLIP-tag™ is a modified version of SNAP-tag, engineered to react with benzylcytosine rather than benzylguanine derivatives. When used in conjunction with SNAP-tag, CLIP-tag enables the orthogonal and complementary labeling of two proteins simultaneously in the same cells.
SNAP-tag® Technologies: Tools to Study Protein Function
Read about the NEB’s set of protein tools for the specific labeling (SNAP-, CLIP-, ACP- and MCP-tags) of fusion proteins.
- Cellular Imaging & Analysis Brochure
- Purification Beads, Columns and Resins Brochure
- Building Blocks
- Comparison of SNAP-tag®/CLIP-tag™ Technologies to GFP
- SNAP-tag® and CLIP-tag™ Substrate Selection Chart
- SNAP-tag®/CLIP-tag® Cloning Vector Selection Chart
- Labeling with SNAP-tag® Technology Troubleshooting Guide
- Genome-wide profiling of nuclease protected domains reveals physical properties of chromatin (2019)
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- Simultaneous dual protein labeling inside live cells
- Protein localization and translocation
- Pulse-chase experiments
- Receptor internalization studies
- Selective cell surface labeling
- Protein pull-down assays
- Protein detection in SDS-PAGE
- Flow cytometry
- High throughput binding assays in microtiter plates
- Biosensor interaction experiments
- FRET-based binding assays
- Single molecule labeling
- Super-resolution microscopy
Lukinavičius, G. et al. (2015) "Fluorescent labeling of SNAP-tagged proteins in cells" Methods Mol. Biol. 1266, 107-118.
Corrêa Jr., I. R. (2015) "Considerations and protocols for the synthesis of custom protein labeling probes" Methods Mol. Biol. 1266, 55-79.
Corrêa Jr., I. R. (2014) "Live-cell reporters for fluorescence imaging" Curr. Opin. Chem. Biol. 20, 36-45.
Bosch, P. J. et al. (2014) "Evaluation of fluorophores to label SNAP-tag fused proteins for multicolor single-molecule tracking microscopy in live cells" Biophys. J. 107, 803-814.
Smith, B. A. et al. (2013) "Three-color single molecule imaging shows WASP detachment from Arp2/3 complex triggers actin filament branch formation" eLife 2, e01008.
Jaiswal, R. et al. (2013) "The Formin Daam1 and Fascin Directly Collaborate to Promote Filopodia Formation" Curr. Biol. 23, 1373-1379.
Breitsprecher, D. et al. (2012) "Rocket Launcher Mechanism of Collaborative Actin Assembly Defined by Single-Molecule Imaging" Science 336, 1164-1168.
Hoskins, A. A. et al. (2011) "Ordered and dynamic assembly of single spliceosomes." Science 331 (6022), 1289-1295.
Zhao, Z. W. et al. (2014) "Spatial organization of RNA polymerase II inside a mammalian cell nucleus revealed by reflected light-sheet superresolution microscopy" Proc. Natl. Acad. Sci. USA 111, 681-686.
Lukinavičius, G. et al. (2013) "A near-infrared fluorophore for live-cell super-resolution microscopy of cellular proteins" Nat. Chem. 5, 132-139.
Jones, S. A. et al. (2011) "Fast, three-dimensional super-resolution imaging of live cells." Nat. Methods 8, 499-505.
Klein, T. et al. (2011) "Live-cell dSTORM with SNAP-tag fusion proteins." Nat. Methods 8, 7-9.
Pellett, P. A. et al. (2011) "Two-color STED microscopy in living cells." Biomed. Opt. Expr. 2, 2364-2371
Hein, B. et al. (2010) "Stimulated Emission Depletion Nanoscopy of Living Cells Using SNAP-Tag Fusion Proteins." Biophys. J. 98, 158-163.
Tissue and Animal Imaging:
Yang, G. et al. (2015) "Genetic targeting of chemical indicators in vivo" Nat. Methods 12, 137-139.
Kohl, J. et al. (2014) "Ultrafast tissue staining with chemical tags" Proc. Natl. Acad. Sci. USA 111, E3805-E3814.
Ivanova, A. et al. (2013) "Age-dependent labeling and imaging of insulin secretory granules" Diabetes 62, 3687-3696.
Gong, H. et al. (2012) "Near-Infrared Fluorescence Imaging of Mammalian Cells and Xenograft Tumors with SNAP-Tag" PLoS ONE 7(3): e34003.
Bojkowska K. et al. (2011) "Measuring in vivo protein half-life." Chem. Biol. 18, 805-815.
Cell-Surface Protein Labeling and Internalization Analysis:
Bitsikas, V. et al. (2014) "Clathrin-independent pathways do not contribute significantly to endocytic flux" eLife 3, e03970.
Jaensch, N. et al. (2014) "Stable Cell Surface Expression of GPI-Anchored Proteins, but not Intracellular Transport, Depends on their Fatty Acid Structure" Traffic 15, 1305-1329.
Cole, N. B. and Donaldson, J. G. (2012) "Releasable SNAP-tag Probes for Studying Endocytosis and Recycling" ACS Chem. Biol. 7, 464-469.
Rošić, S. et al. (2014) "Repetitive centromeric satellite RNA is essential for kinetochore formation and cell division" J. Cell Biol. 207, 335-349.
Stoops, E. H. et al. (2014) "SNAP-Tag to Monitor Trafficking of Membrane Proteins in Polarized Epithelial Cells" Methods Mol. Biol. 1174, 171-182.
Bordor, D. L. et al. (2012) "Analysis of Protein Turnover by Quantitative SNAP-Based Pulse-Chase Imaging" Curr. Protoc. Cell Biol. 55, 8.8.1-8.8.34.
Register, A. C. et al. (2014) "SH2-Catalytic Domain Linker Heterogeneity Influences Allosteric Coupling across the SFK Family" Biochemistry 53, 6910-6923.
Shi, G. et al. (2012) "SNAP-tag based proteomics approach for the study of the retrograde route" Traffic 13, 914-925.
Bieling, P. et al. (2010) "A minimal midzone protein module controls formation and length of antiparallel microtubule overlaps" Cell 142, 420-432.
Protein-Protein and Protein-Ligand Interactions:
Griss, R. et al. (2014) "Bioluminescent sensor proteins for point-of-care therapeutic drug monitoring" Nat. Chem. Biol. 10, 598-603.
Chidley, C. et al. (2011) "A yeast-based screen reveals that sulfasalazine inhibits tetrahydrobiopterin biosynthesis." Nat. Chem. Biol. 7, 375-383.
Gautier A. et al. (2009) "Selective Cross-Linking of Interacting Proteins using Self-Labeling Tags" J. Am. Chem. Soc. 131, 17954-17962.
Maurel D. et al. (2008) "Cell-surface protein-protein interaction analysis with time-resolved FRET and SNAP-tag technologies: application to GPCR oligomerization." Nat. Methods 5, 561-567.
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Watch as Chris Provost, of New England Biolabs, performs fluorescent imaging of live COS-7 cells expressing SNAP-tag® fusion proteins.
View an interactive tutorial explaining the mechanism of our SNAP-tag® technologies and reagents available for researchers wishing to study the function and localization of proteins in live or fixed cells.