ACP/MCP-tag Substrates

Cellular Analysis

ACP/MCP-tag substrates are conjugated to the phosphopantetheinyl moeity of Coenzyme A (CoA) and require a separate enzyme (ACP or SFP Synthase) for labeling. The labeling reaction is specific for fusion proteins expressed on the cell surface. The same substrates are used to label both the ACP- and the MCP-tags; specificity is determined by the synthase used for labeling.

  1. Fluorescent Labeling of COS-7 Expressing SNAP-tag Fusion Proteins for Live Cell Imaging

    Watch as Chris Provost, of New England Biolabs, performs fluorescent imaging of live COS-7 cells expressing SNAP-tag® fusion proteins.

  2. SNAP-tag Overview Tutorial

    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.

Featured Products


  • Naturally Secreted – Used in live cell assays
  • Sensitivity – Brightest luciferases available; enables single cell applications 
  • Stability – Samples can be stored for several days with no loss of activity 
  • Easy-to-use – Cell lysis not necessary 
  • Non-destructive – Living cells can be used in downstream assays 
  • Flexible – Activity can also be measured in cell lysates


  • Transfection optimization studies 
  • Promoter/enhancer assays 
  • High throughput assays 
  • Multiplex assays 
  • Multiple assays with other reporters
  • Secretory pathway reporter assays
  • Signal transduction
  • siRNA potency screening
  • Time course studies
  • Single cell assays, including stem cells and primary cells
  • Live cell assays
  • Assays in difficult to transfect cells