Recombinant Human ErbB3/Her3 His-tag Protein, CF

Catalog # Availability Size / Price Qty
10368-RB-050
Recombinant Human ErbB3/Her3 His-tag Protein Bioactivity
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Recombinant Human ErbB3/Her3 His-tag Protein, CF Summary

Product Specifications

Purity
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Activity
Measured by its ability to inhibit the biological activity of Neuregulin-1-beta 1 on MCF‑7 human breast cancer cells. Karey, K.P. et al. (1988) Cancer Research 48:4083. The ED50 for this effect is 0.3-3 µg/mL in the presence of 10 ng/mL Recombinant Human NRG1‑ beta 1/HRG1‑ beta 1 Extracellular Domain (Catalog # 377-HB).
Source
Human embryonic kidney cell, HEK293-derived human ErbB3/Her3 protein
Human ErbB3/Her3
(Ser20-Gly538)
Accession # P21860-1
YSKGSQSRMGGGGALQWNCSGGIQ  6-His tag
N-terminus C-terminus
Accession #
N-terminal Sequence
Analysis
Ser20
Predicted Molecular Mass
61 kDa
SDS-PAGE
73-83 kDa, under reducing conditions

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10368-RB

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

10368-RB

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Data Images

Bioactivity Recombinant Human ErbB3/Her3 His-tag Protein Bioactivity View Larger

Recombinant Human ErbB3/Her3 His-tag (Catalog # 10368-RB) inhibits the biological activity of Recombinant Human NRG1-beta 1/HRG1-beta 1 ECD Protein (Catalog # 377-HB) on MCF-7 human breast cancer cells. The ED50 for this effect is 0.3-3 µg/mL.

SDS-PAGE Recombinant Human ErbB3/Her3 His-tag Protein SDS-PAGE View Larger

2 μg/lane of Recombinant Human ErbB3/Her3 His-tag (Catalog # 10368-RB) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 73-83 kDa.

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Background: ErbB3/Her3

ErbB3, also called Her3 (human epidermal growth factor receptor 3), is a type I membrane glycoprotein that is a member of the ErbB family of tyrosine kinase receptors. ErbB family members serve as receptors for the epidermal growth factor (EGF) family of growth factors. Among ErbB family members, ErbB3 is unique in that it contains a defective kinase domain. ErbB3 is expressed in keratinocytes, melanocytes, skeletal muscle cells, embryonic myoblasts and Schwann cells. Monomeric ErbB3 serves as a low affinity receptor for the heregulins (HRG). ErbB3 heterodimerizes with ErbB2 to form a high affinity receptor complex. In contrast, ErbB3 homodimerization or heterodimerization with ErbB4 forms a low affinity heregulin-binding complex. Because ErbB3 contains a defective kinase domain, the kinase domain of ErbB2 is responsible for initiating the tyrosine phosphorylation signal through the heterodimeric receptor. It has been found that a discrete three amino acid signal in the ErbB3 cytoplasmic domain is critical for transactivation of ErbB2. The cytoplasmic domain of ErbB3 also contains six consensus binding motifs for the SH2 domain of the regulatory p85 subunit of phosphoinositide 3-kinase (PI 3-kinase, PI3K) as well as one proline-rich consensus binding motif for the SH3 domain of p85. Human ErbB3 consists of 1342 amino acids (aa) with a 19 aa signal sequence, a 624 aa extracellular domain, a 21 aa transmembrane region, and a 678 aa cytoplasmic domain. ErbB3 appears to play roles in development, cancer, communication at the neuromuscular junction and regulation of cell growth and differentiation.

References
  1. Kraus, M.H. et al. (1989) Proc. Natl. Acad. Sci. 86:9193.
  2. Plowman, G.D. et al. (1990) Proc. Natl. Acad. Sci. USA 87:4905.
  3. Carraway, K.L. 3rd et al. (1994) J. Biol. Chem. 269:14303.
  4. Emkey, R. and C.R. Kahn (1997) J. Biol. Chem. 272:31172.
  5. Sundaresan, S. et al. (1998) Endocrinology 139:4756.
  6. Hellyer, N.J. et al. (1998) Biochem. J. 333:757.
  7. Schaefer, G. et al. (1999) J. Biol. Chem. 274:859.
  8. Hellyer, N.J. et al. (2001) J. Biol. Chem. 276:42153.
  9. Schlessinger, J. (2000) Cell 103:211.
  10. Daly, R.J. (1999) Growth Factors 16:255.
Long Name
Receptor Tyrosine Protein Kinase ErbB3
Entrez Gene IDs
2065 (Human); 13867 (Mouse)
Alternate Names
c-erbB3; EC 2.7.10; EC 2.7.10.1; ErbB3; ErbB-3; erbB3-S; HER3; HER3c-erbB-3; LCCS2; lethal congenital contracture syndrome 2; MDA-BF-1; MGC88033; p180-ErbB3; p45-sErbB3; p85-sErbB3; Proto-oncogene-like protein c-ErbB-3; receptor tyrosine-protein kinase erbB-3; Tyrosine kinase-type cell surface receptor HER3; v-erb-b2 erythroblastic leukemia viral oncogene homolog 3 (avian)

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