Product Class: Other

Item# Description List Price Web Price Qty
S9236S BC-NH2 - 2 mg $567.00
*On-line ordering is for Canadian customers only. Web pricing is applicable only to orders placed online at

    Product Introduction

    BC-NH2 is an amine-terminated building block for the one-step synthesis of CLIP-tag™ substrates from NHS esters or other activated carboxylic esters of labels or surfaces.

    • This building block allows you to make custom CLIP-tag substrates for labeling CLIP-tag fusion proteins
    • It is particularly useful for the synthesis of fluorescent CLIP-tag substrates

    Product Information


    The CLIP-tag protein labeling system enables the specific, covalent attachment of virtually any molecule to a protein of interest. CLIP-tag is a protein tag based on human O6-alkylguanine-DNA-alkyltransferase (hAGT). CLIP-tag substrates are derivatives of benzylcytosine (BC). In the labeling reaction, the substituted benzyl group of the substrate is covalently attached to the reactive cysteine of CLIP-tag forming a stable thioether bond. Although CLIP-tag is based on the same protein as SNAP-tag®, the benzylcytosine substrates form a separate class of substrates, different from the benzylguanine substrates recognized by SNAP-tag. CLIP-tag and SNAP-tag can be used for orthogonal and complementary labeling of two proteins simultaneously in the same cells.

    There are two steps to using this system: sub-cloning and expression of the protein of interest as a CLIP-tag fusion, and labeling of the fusion with the CLIP-tag substrate of choice. Expression of CLIP-tag fusion proteins is described in the documentation supplied with CLIP-tag plasmids. The labeling of the fusion proteins with the CLIP-tag substrate is described in this document.

    Figure 1. Structure of BC-NH2 (MW 230.3 g/mol)
    Figure 1. Structure of BC-NH2 (MW 230.3 g/mol)

    Product Categories:
    Building Blocks Products,
    CLIP-tag™ Substrates Products,
    Protein Labeling Products
    Protein Labeling Snap Clip,
    Cell Imaging

    Properties & Usage

      Storage Temperature


      Product Notes

      1. Dry BC-NH2 should be stored at -20°C.
      2. The BC-NH2 building block is soluble in anhydrous DMF. Choose a solvent volume that will be compatible with the final use. Heating at 37°C, vortexing and/or sonication will aid dissolution. Unused BC-NH2 substrate dissolved in DMF should be stored at -20°C.


      1. Gautier A. et al. (2008). Chemistry & Biology. 15, 128-136.

      Protocols, Manuals & Usage


      1. Labeling CLIP-tag Fusion Proteins with BC-substrates (S9236)
      2. Reaction Conditions for Chemical Coupling (S9236)


      The Product Summary Sheet, or Data Card, includes details for how to use the product, as well as details of its formulation and quality controls. The following file naming structure is used to name the majority of these document files: [Catalog Number]Datasheet-Lot[Lot Number]. For those product lots not listed below, please contact NEB at [email protected] or fill out the Technical Support Form for appropriate document.)

      Tools & Resources

      Selection Charts

      • Building Blocks
      • Comparison of SNAP-tag®/CLIP-tag™ Technologies to GFP

      Faqs & Troubleshooting


      1. Cellular Imaging and Analysis FAQs


      • Labeling with SNAP-tag® Technology Troubleshooting Guide

      Quality, Safety & Legal

      Quality Assurance Statement

      Quality Control tests are performed on each new lot of NEB product to meet the specifications designated for it. Specifications and individual lot data from the tests that are performed for this particular product can be found and downloaded on the Product Specification Sheet, Certificate of Analysis, data card or product manual. Further information regarding NEB product quality can be found here.


      The Specification sheet is a document that includes the storage temperature, shelf life and the specifications designated for the product. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]

      Certificate Of Analysis

      The Certificate of Analysis (COA) is a signed document that includes the storage temperature, expiration date and quality controls for an individual lot. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]_[Lot Number]

      Safety DataSheets

      The following is a list of Safety Data Sheet (SDS) that apply to this product to help you use it safely.

      Legal and Disclaimers

      This product is covered by one or more patents, trademarks and/or copyrights owned or controlled by New England Biolabs, Inc (NEB).

      While NEB develops and validates its products for various applications, the use of this product may require the buyer to obtain additional third party intellectual property rights for certain applications.

      For more information about commercial rights, please contact NEB's Global Business Development team at [email protected].

      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.


      Cellular Imaging and Analysis (i.e., SNAP and CLIP products)

      Notice to Buyer/User: The Buyer/User has a non-exclusive license to use this system or any component thereof for RESEARCH AND DEVELOPMENT ONLY. Commercial use of this system or any components thereof requires a license from New England Biolabs, Inc., 240 County Road, Ipswich, MA 01938. For detailed information see our Terms of Use .

      These patents and patent applications are owned by Covalys, or owned by the Ecole Polytechnique Fédérale de Lausanne (EPFL) and exclusively licensed to Covalys and NEB.

      The products and/or their use may be covered by one or more of the following patents and patent applications:
      Labeling of Fusion Proteins with Synthetic Probes: US 8,227,602; US 8,623,627; and EP 2 049 499.