• Product name
    Anti-ErbB2 Affibody® Molecule
    See all ErbB 2 affibody® molecule
  • Specificity
    This product binds to the extracellular domain of human ErbB2. A head-to-tail dimer through its peptide bond.
  • Tested applications
    Suitable for: IHC-Fr, ICC/IF, Flow Cytmore details
    Unsuitable for: IHC-P
  • Species reactivity
    Reacts with: Human
  • Immunogen


  • General notes

    This product is a recombinant protein produced in E.coli.

    What are Affibody Molecules?
    Affibody® affinity ligands are unique research reagents, produced using innovative protein-engineering technologies. They are small, simple proteins composed of a three-helix bundle based on the scaffold of one of the IgG-binding domains of Protein A. Protein A is a surface protein from the bacterium Staphylococcus aureus. This scaffold has excellent features as an affinity ligand and can be designed to bind with high affinity to any given target protein. The domain consists of 58 amino acids, 13 of which are randomized to generate Affibody® libraries with a large number of ligand variants. Thus, the libraries consist of a multitude of protein ligands with an identical backbone and variable surface-binding properties. In function, Affibody® Molecules mimic monoclonal antibodies. Compared to antibodies, the most striking dissimilarity of Affibody® Molecules is the small size. Affibody® Molecules have a molecular weight of 6kDa, compared to the molecular weight of antibodies, which is 150kDa. In spite of it's small size, the binding site of Affibody® Molecules is similar to that of an antibody. The advantages of Affibody® Molcules over antibodies are: -their small size -the simple structure of the molecules -its robust physical properties; able to withstand a broad range of analytical conditions, including extreme pH and elevated temperature -its ability to fold correctly intracellularly -the fast and cost effective production in bacteria -the potential to couple Affibody® Molecules in multimeric constructs Affibody® Molecules have highly competitive properties for applications within affinity purification, sample preparation, protein detection and in vitro diagnostics.

    ab50345 is a secondary antibody suitable for use in the process of detecting this Affibody® Molecule. This Anti-ErbB2 Affibody® Molecule is modified with a unique C-terminal cysteine for directed single-point chemical modification, facilitating labelling with fluorescent dyes, biotin or coupling to matrices. However, tail-to-tail dimers are spontaneously generated via a disulphide bridge between the C-terminal cysteines. Prior to coupling via the C-terminal the Affibody® Molecule needs to be reduced to expose the reactive cysteine residue. Recommended reducing condition is 20mM DTT at a pH above 7.5 and incubation at room temperature for 2 hours. Remove excess DTT by passage through a desalting column, not by dialysis.



  • Form
  • Storage instructions
    Shipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C long term.
  • Storage buffer
    pH: 7.40
    Constituents: PBS, 0.079% Ammonium bicarbonate
  • Concentration information loading...
  • Purification notes
    The purity of this product is >98% as determined by SDS-PAGE (Coomassie blue staining) and RP-PLC analysis.
  • Research areas
  • Function
    Protein tyrosine kinase that is part of several cell surface receptor complexes, but that apparently needs a coreceptor for ligand binding. Essential component of a neuregulin-receptor complex, although neuregulins do not interact with it alone. GP30 is a potential ligand for this receptor. Regulates outgrowth and stabilization of peripheral microtubules (MTs). Upon ERBB2 activation, the MEMO1-RHOA-DIAPH1 signaling pathway elicits the phosphorylation and thus the inhibition of GSK3B at cell membrane. This prevents the phosphorylation of APC and CLASP2, allowing its association with the cell membrane. In turn, membrane-bound APC allows the localization of MACF1 to the cell membrane, which is required for microtubule capture and stabilization.
    In the nucleus is involved in transcriptional regulation. Associates with the 5'-TCAAATTC-3' sequence in the PTGS2/COX-2 promoter and activates its transcription. Implicated in transcriptional activation of CDKN1A; the function involves STAT3 and SRC. Involved in the transcription of rRNA genes by RNA Pol I and enhances protein synthesis and cell growth.
  • Tissue specificity
    Expressed in a variety of tumor tissues including primary breast tumors and tumors from small bowel, esophagus, kidney and mouth.
  • Involvement in disease
    Hereditary diffuse gastric cancer
    Ovarian cancer
    Lung cancer
    Gastric cancer
    Chromosomal aberrations involving ERBB2 may be a cause gastric cancer. Deletions within 17q12 region producing fusion transcripts with CDK12, leading to CDK12-ERBB2 fusion leading to truncated CDK12 protein not in-frame with ERBB2.
  • Sequence similarities
    Belongs to the protein kinase superfamily. Tyr protein kinase family. EGF receptor subfamily.
    Contains 1 protein kinase domain.
  • Post-translational
    Autophosphorylated. Autophosphorylation occurs in trans, i.e. one subunit of the dimeric receptor phosphorylates tyrosine residues on the other subunit (Probable). Ligand-binding increases phosphorylation on tyrosine residues (PubMed:27134172). Signaling via SEMA4C promotes phosphorylation at Tyr-1248 (PubMed:17554007). Dephosphorylated by PTPN12 (PubMed:27134172).
  • Cellular localization
    Cytoplasm. Nucleus and Cell membrane. Cytoplasm, perinuclear region. Nucleus. Translocation to the nucleus requires endocytosis, probably endosomal sorting and is mediated by importin beta-1/KPNB1.
  • Information by UniProt
  • Alternative names
    • Verb b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog
    • C erb B2/neu protein
    • CD340
    • CD340 antigen
    • Cerb B2/neu protein
    • CerbB2
    • Erb b2 receptor tyrosine kinase 2
    • ERBB2
    • HER 2
    • HER 2/NEU
    • HER2
    • Herstatin
    • Human epidermal growth factor receptor 2
    • Metastatic lymph node gene 19 protein
    • MLN 19
    • MLN19
    • NEU
    • NEU proto oncogene
    • Neuro/glioblastoma derived oncogene homolog
    • Neuroblastoma/glioblastoma derived oncogene homolog
    • NGL
    • p185erbB2
    • Proto-oncogene c-ErbB-2
    • Proto-oncogene Neu
    • Receptor tyrosine-protein kinase erbB-2
    • TKR1
    • Tyrosine kinase type cell surface receptor HER2
    • Tyrosine kinase-type cell surface receptor HER2
    • V erb b2 avian erythroblastic leukemia viral oncogene homolog 2
    • V erb b2 avian erythroblastic leukemia viral oncogene homolog 2 (neuro/glioblastoma derived oncogene homolog)
    • V erb b2 avian erythroblastic leukemia viral oncoprotein 2
    • V erb b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog
    • V erb b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog (avian)
    • Verb b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog (avian)
    see all
  • Database links


Our Abpromise guarantee covers the use of ab31889 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
IHC-Fr 1/250 - 1/2000.
ICC/IF Use at an assay dependent concentration.
Flow Cyt Use at an assay dependent concentration.
  • Application notes
    Is unsuitable for IHC-P.
  • Images

    • Fluorescence staining of cells

      The human mammary gland cell line SK-BR3 expresses high levels of ErbB2 and this cell line was used to demonstrate Affibody® fluorescence staining and to compare three different staining reagents for cells. Fluorescein conjugated (a), biotin conjugated (b) and Oregon Green® (c) labeled Affibody® molecule were used as reagents in this experiment. The SK-BR3 cells were stained for 30 minutes at a concentration of 1-5 μg Affibody® molecule/ml. Figure 1 a-c shows bright membrane staining with all three reagents. As both the fluorescein conjugated and Oregon Green® labeled Affibody® molecule function as one step reagents, the staining procedure was completed in only 30 minutes. Nuclei were counter stained with DAPI (blue fluorescence).

    • Fluorescence staining of frozen tissue sections

      Frozen tissue sections were obtained from snap frozen xenograft SK-OV-3 tumors. The sections were stained with Oregon Green® conjugated Anti-ErbB2 Affibody® molecule for 30 minutes at a concentration of 2 μg Affibody® molecule/ml. The resulting microscope image shows brightly stained SK-OV-3 cells inside the tumor whereas the connective tissue surrounding and traversing the tumor cells remained negative.

    • Immunohistochemical staining of frozen tissue sections

      Xenograft tumors of the human ovarian adenocarcinoma, SK-OV-3 was soaked in formaldehyde and then snap-frozen in liquid nitrogen and used for immunohistochemical staining with the HRP-conjugated Anti- ErbB2 Affibody® molecule. Frozen tissue sections were stained with HRP-conjugated Anti-ErbB2 Affibody® molecule for 45 minutes at room temperature. The staining was developed with DAB substrate and the tissue sections were counter stained with Mayers Haematoxylin. The resulting microscope image shows strong brown membrane staining of tumor cells in the xenograft whereas the mouse connective tissue that surrounds and traverses the tumor remains negative. Thus, the HRP-conjugated Anti-ErbB2 Affibody® molecule is a rapid reagent for ErbB2 specific immunohistochemical staining of frozen tissue sections.

    • Flow cytometry analysis of ErbB2 expression

      The Oregon Green®-conjugated Anti-ErbB2 Affibody® molecule was used as a one step detection reagent for analysis of ErbB2 expression using flow cytometry. Cells from the ErbB2 positive human ovarian cancer cell line SK-OV-3 and the ErbB2-negative human neuroblastoma cell line SH-SY5Y were stained with the Oregon Green®-conjugated Anti-ErbB2 Affibody® molecule. As shown in figure a, staining with Oregon Green®- conjugated Anti-ErbB2 Affibody® molecule resulted in increased fluorescence intensity and the whole cell population of SK-OV-3 cells was shifted to the right (red line) compared to the control (black line). On the contrary, Anti-ErbB2 Affibody® molecule staining of the ErbB2 negative cell line SH-SY5Y did not cause a shift in fluorescence intensity, as shown in figure b.


    This product has been referenced in:
    • Pérez-Treviño P  et al. 3D Imaging Detection of HER2 Based in the Use of Novel Affibody-Quantum Dots Probes and Ratiometric Analysis. Transl Oncol 11:672-685 (2018). Read more (PubMed: 29627705) »
    • Baldassarre T  et al. Endophilin A2 promotes HER2 internalization and sensitivity to trastuzumab-based therapy in HER2-positive breast cancers. Breast Cancer Res 19:110 (2017). Read more (PubMed: 28974266) »
    See all 2 Publications for this product

    Customer reviews and Q&As

    1-5 of 5 Q&A


    Merci de nous avoir contactés.

    J’ai eu une réponse du laboratoire concernant le contrôle (la ligne noir sur l’image sur la fiche technique) pour ab31889 :

    « Nous avons utilisé du PBS comme control négatif et des cellules HER2 négative en tant que contrôle de spécificité. Nous n'avons pas un contrôle isotype pour le moment. Cependant, nous avons connu très peu de réactions croisées avec cet anticorps. »

    J'espère que ces informations vous seront utiles. N'hésitez pas à nous contacter de nouveau si vous avez d'autres questions.

    Monoclonal de lapin gratuit pour tout achat d'anticorps primaire, dans la limite des stocks disponibles. Notez le code "RABMAB-XBSMG" sur votre prochaine commande d’anticorps primaire. Pour plus d'informations, visitez le lien suivant: https://www.abcam.com/index.html?pageconfig=resource&rid=15447

    Read More


    Thank you for your enquiry. We have never looked for binding between ab31889 and mouse recombinant HER2/ErbB2. We do know from biodistribution studies that it does not bind to normal mouse tissues. However, HER2 is normally expressed at a low level or not at all and the ab31889 has not been tested on high HER2 expressing mouse cells. Mouse and human ErbB2 are quite homologous (87% acc. to Swissprot). So there is good chance for ab31889 to cross-react with mouse ErbB2. I hope this information helps you, and please do not hesitate to contact us if you have further questions.

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    Thank you for your inquiry. The affinity of the monomeric Anti-HER2 Affibody® Molecule (not this product) has been measured, with a Kd value of 32 pM (picomolar). However, ab31889 is a head-to-tail dimer which has an even higher affinity to HER2 due to avidity effects. This higher affinity has not been quantified. I hope this information is helpful to you. Please do not hesitate to contact us if you need any more advice or information.

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    Thank you for your enquiry. The amino acid sequence for the Anti-HER2 Affibody® Molecule ab31889 can be found in the article by Orlova et al. (2006) "Tumor Imaging Using a Picomolar Affinity HER2 Binding Affibody Molecule" Cancer Res 2006; 66(8): 4339-48. It is denoted in this article as HER2:477 (figure 1.c) and the sequence of the recognition site is MRNYWALVAKRRY. The theoretical pI of the Anti-HER2 Affibody® Molecule is 9.7. I hope this information helps. Please do not hesitate to contact us if you need any more advice or information.

    Read More


    Thank you for your enquiry. The ab31889 Anti-ErbB2 Affibody® is not an antibody, but an 'Affibody'. The backbone of Affibody® molecules are derived from a 58 amino acid IgG-binding domain of Staphylococcal Protein A. There is further information on 'Affibodies' on the datasheet for this product. An IgG isotype control works only with antibodies and is not applicable for Affibody® Molecules. For additional information about our fluorescence staining of a HER2-positive cell line using our Anti-HER2 Affibody® Molecule, see the article by Orlova et al. (2006) "Tumor Imaging Using a Picomolar Affinity HER2 Binding Affibody Molecule" Cancer Res 2006; 66(8): 4339-48. I hope this will be helpful to you. Should you have any further questions, please do not hesitate to contact us again.

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