Human SIRP alpha, His Tag (HPLC-verified) (SIA-H5225) is expressed from human 293 cells (HEK293). It contains AA Glu 31 - Arg 370 (Accession # NP_001035111).
Predicted N-terminus: Glu 31
This protein carries a polyhistidine tag at the C-terminus.
The protein has a calculated MW of 38.1 kDa. The protein migrates as 47-55 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
Less than 1.0 EU per μg by the LAL method.
>95% as determined by SDS-PAGE.
>95% as determined by SEC-HPLC.
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
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Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
No activity loss was observed after storage at:
- 4-8°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
Human SIRP alpha, His Tag (HPLC-verified) on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
The purity of Human SIRP alpha, His Tag (HPLC-verified) (Cat. No. SIA-H5225) was greater than 95% as determined by SEC-HPLC.
Immobilized Human CD47, Fc Tag (Cat. No. CD7-H5256) at 2 µg/mL (100 µl/well) can bind Human SIRP alpha, His Tag (Cat. No. SIA-H5225) with a linear range of 16-250 ng/mL (QC tested).
FACS assay shows that recombinant Human SIRP alpha, His Tag (HPLC-verified) (Cat. No. SIA-H5225) can bind to Jurkat cell expressing CD47. The concentration of SIRP alpha used is 1 μg/ml (Routinely tested).
FACS analysis shows that the binding of Human SIRP alpha, His Tag (HPLC-verified) (Cat. No. SIA-H5225) to Jurkat expressing CD47 was inhibited by increasing concentration of neutralizing anti-CD47 antibody. The concentration of SIRP alpha used is 1 μg/ml. IC50=0.2257 μg/ml (Routinely tested).
Authors: Yu XY, et al.
Journal: Biochimie 2018
Tyrosine-protein phosphatase non-receptor type substrate 1 (SHPS1) is also known as CD172 antigen-like family member A (CD172a), Macrophage fusion receptor, MyD-1 antigen, Signal-regulatory protein alpha (SIRPA or SIRP alpha) or p84, is a member of the SIRP family, and also belongs to the immunoglobulin superfamily. SIRP alpha is Ubiquitous and highly expressed in brain. SIRPA / CD172a is immunoglobulin-like cell surface receptor for CD47 and acts as docking protein and induces translocation of PTPN6, PTPN11 and other binding partners from the cytosol to the plasma membrane. SIRPA / SHPS-1 supports adhesion of cerebellar neurons, neurite outgrowth and glial cell attachment and may play a key role in intracellular signaling during synaptogenesis and in synaptic function By similarity. SIRPA / MyD1 involved in the negative regulation of receptor tyrosine kinase-coupled cellular responses induced by cell adhesion, growth factors or insulin and mediates negative regulation of phagocytosis, mast cell activation and dendritic cell activation. CD47 binding prevents maturation of immature dendritic cells and inhibits cytokine production by mature dendritic cells.