Additional sequence informationEncodes the signal peptide & extracellular domain of human Erythropoietin receptor (EPO R, aa 1-250) fused to the Fc region IgG1 (aa 93-330). Chimeric protein was expressed in modified 293 cells.
The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Biological activityThe ED50 of ab84001 is typically 0.15-2.5 ng/ml as measured by its ability to neutralize EPO-mediated proliferation of TF-1 cells.
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Preparation and Storage
Stability and Storage
Shipped at 4°C. After reconstitution store at -20ºC. Avoid freeze / thaw cycles.
Constituents: 10% Trehalose, 1% Human serum albumin
This product is an active protein and may elicit a biological response in vivo, handle with caution.
ReconstitutionIt is recommended that 0.5 ml of sterile phosphate-buffered saline be added to the vial.
Following reconstitution, short-term storage at 4°C is recommended, and longer-term storage of aliquots at -18 to -20°C. Repeated freeze thawing is not recommended.
Erythropoietin receptor precursor
FunctionReceptor for erythropoietin. Mediates erythropoietin-induced erythroblast proliferation and differentiation. Upon EPO stimulation, EPOR dimerizes triggering the JAK2/STAT5 signaling cascade. In some cell types, can also activate STAT1 and STAT3. May also activate the LYN tyrosine kinase. Isoform EPOR-T acts as a dominant-negative receptor of EPOR-mediated signaling.
Tissue specificityErythroid cells and erythroid progenitor cells. Isoform EPOR-F is the most abundant form in EPO-dependent erythroleukemia cells and in late-stage erythroid progenitors. Isoform EPOR-S and isoform EPOR-T are the predominant forms in bone marrow. Isoform EPOR-T is the most abundant from in early-stage erythroid progenitor cells.
Involvement in diseaseDefects in EPOR are the cause of erythrocytosis familial type 1 (ECYT1) [MIM:133100]. ECYT1 is an autosomal dominant disorder characterized by increased serum red blood cell mass, elevated hemoglobin and hematocrit, hypersensitivity of erythroid progenitors to erythropoietin, erythropoietin low serum levels, and no increase in platelets nor leukocytes. It has a relatively benign course and does not progress to leukemia.
Sequence similaritiesBelongs to the type I cytokine receptor family. Type 1 subfamily. Contains 1 fibronectin type-III domain.
DomainThe WSXWS motif appears to be necessary for proper protein folding and thereby efficient intracellular transport and cell-surface receptor binding. The box 1 motif is required for JAK interaction and/or activation. Contains 1 copy of a cytoplasmic motif that is referred to as the immunoreceptor tyrosine-based inhibitor motif (ITIM). This motif is involved in modulation of cellular responses. The phosphorylated ITIM motif can bind the SH2 domain of several SH2-containing phosphatases.
Post-translational modificationsOn EPO stimulation, phosphorylated on C-terminal tyrosine residues by JAK2. The phosphotyrosine motifs are also recruitment sites for several SH2-containing proteins and adapter proteins which mediate cell proliferation. Phosphorylation on Tyr-454 is required for PTPN6 interaction, Tyr-426 for PTPN11. Tyr-426 is also required for SOCS3 binding, but Tyr-454/Tyr-456 motif is the preferred binding site. Ubiquitinated by NOSIP; appears to be either multi-monoubiquitinated or polyubiquitinated. Ubiquitination mediates proliferation and survival of EPO-dependent cells.
Cellular localizationCell membrane and Secreted. Secreted and located to the cell surface.
Recombinant human EPO Receptor protein (Fc Chimera) images
SDS-PAGE - EPO Receptor protein (Fc Chimera Active) (ab84001)
Lane 1 – MW markers; Lane 2 – ab84001 ; Lane 3 – ab84001 treated with PNGase F to remove potential N-linked glycans; Lane 4 – ab84001 treated with a glycosidase cocktail to remove potential N- and O linked glycans. 10 µg of protein was loaded per lane. Gel was stained with Deep Purple™. Appearance of additional band at lower MW after treatment with PNGase F indicates the presence of N-linked glycans. A possible subsequent drop in MW after treatment with a glycosidase cocktail indicates O-linked glycans may be present. Additional high MW bands in lane 4 are glycosidase enzymes.
References for Recombinant human EPO Receptor protein (Fc Chimera) (ab84001)
has not yet been referenced specifically in any publications.
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