SNAP Companion

The non-overlapping substrate specificity of SNAP-tag® and CLIP-tag™ enables the orthogonal and complementary labeling of two proteins simultaneously in the same cell. Furthermore, SNAP-tag and CLIP-tag based pulse-chase experiments allow for visualization of different generations of proteins and analysis of protein turnover in living cells (1-3). Additionally, there are a numbers of companion products designed to enable a wide variety of other applications including: Biotin substrates, SDS-PAGE specific SNAP-tag and CLIP-Vista labels, non-fluorescent blocking agents, resin and magnetic beads for pull-down applications, building blocks for the generation of custom substrates, and a SNAP-tag specific purified protein and antibody.


  1. Jansen, L. et al (2007) J.Cell. Biol. 176, 795-805. PMID: 17339380
  2. Farr, G.A. (2009) J. Cell. Biol. 186, 269-282. PMID: 19620635
  3. Milenkovic, L. (2010) J. Cell. Biol. 187, 365-374. PMID: 19948480

SNAP-tag® is a registered trademark of New England Biolabs, Inc.
CLIP-tag™ is a trademark of New England Biolabs, inc.

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FAQs for SNAP Companion
Protocols for SNAP Companion
Application Notes for SNAP Companion
  • Clone and express once, then use with a variety of substrates
  • Non-toxic to living cells
  • Wide selection of fluorescent substrates
  • Highly specific covalent labeling
  • Simultaneous dual labeling
  • 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
Protein labeling with SNAP-tag and CLIP-tag
The SNAP- (gold) or CLIP-tag (purple) is fused to the protein of interest (blue). Labeling occurs through covalent attachment to the tag, releasing either a guanine or a cytosine moiety.
Legal Information

Products and content are covered by one or more patents, trademarks and/or copyrights owned or controlled by New England Biolabs, Inc (NEB). The use of trademark symbols does not necessarily indicate that the name is trademarked in the country where it is being read; it indicates where the content was originally developed. The use of this product may require the buyer to obtain additional third-party intellectual property rights for certain applications. For more information, please email

This product is intended for research purposes only. This product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.