1. No Kinase Activity 2. Using the Octet RED System, the affinity constant (Kd) of human ErBB3-GST bound to human NRG1 (aa 2-224) was 20 nM.

HER3/ERBB3 Protein, Human, Recombinant (aa 730-1065, His & GST) is expressed in Baculovirus insect cells with His and GST tag. The predicted molecular weight is 65 kDa and the accession number is P21860-1.

Human

Baculovirus Insect Cells

c-erbB3,ErbB-3,p45-sErbB3,LCCS2,p85-sErbB3,HER3,EEBB3,MDA-BF-1,p180-ErbB3,c-erbB-3,erbB3-S,erb-b2 receptor tyrosine kinase 3

The cytoplasmic domain (Pro 730-Ser 1065) of Human ErbB3 (NP_001973.2) was fused with the N-terminal polyhistidine-tagged GST tag at the N-terminus.

> 75 % as determined by SDS-PAGE

A Certificate of Analysis (CoA) containing reconstitution instructions is included with the products. Please refer to the CoA for detailed information.

It is recommended to store recombinant proteins at -20°C to -80°C for future use. Lyophilized powders can be stably stored for over 12 months, while liquid products can be stored for 6-12 months at -80°C. For reconstituted protein solutions, the solution can be stored at -20°C to -80°C for at least 3 months. Please avoid multiple freeze-thaw cycles and store products in aliquots.

ErbB3, also known as Her3(human epidermal growth factor receptor3), is a member of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases. This membrane-bound glycoprotein has a neuregulin binding domain but has not an active kinase domain., and therefore can not mediate the intracellular signal transduction through protein phosphorylation. However, its heterodimer with ErbB2 or other EGFR members responsible for tyrosine phosphorylation forms a receptor complex with high affinity, and initiates the related pathway which lead to cell proliferation or differentiation. ErbB3 has been shown to implicated in numerous cancers, including prostate, bladder, and breast tumors. This protein has different isoforms derived from alternative splicing variants, and among which, the secreted isoform lacking the intermembrane region modulates the activity of membrane-bound form.Cancer ImmunotherapyImmune CheckpointImmunotherapyTargeted Therapy