Bioactive grade

Recombinant human SIRP alpha protein (Fc Chimera Active) (ab221342)


  • Product name

    Recombinant human SIRP alpha protein (Fc Chimera Active)
    See all SIRP alpha proteins and peptides
  • Biological activity

    Measured by its binding ability in a functional ELISA. A. Immobilized Human CD47, His Tag at 2 μg/mL can bind ab221342 with a linear range of 8-250 ng/mL.

  • Purity

    > 95 % SDS-PAGE.
    >90% pure as determined by SEC-HPLC.
  • Endotoxin level

    < 1.000 Eu/µg
  • Expression system

    HEK 293 cells
  • Accession

  • Protein length

    Protein fragment
  • Animal free

  • Nature

    • Species

    • Sequence

    • Predicted molecular weight

      64 kDa including tags
    • Amino acids

      31 to 370
    • Additional sequence information

      This protein carries a mouse IgG1 Fc tag at the C-terminus (Val 98-Lys 324; AAK53870.1). (NP_001035111).

Associated products


Our Abpromise guarantee covers the use of ab221342 in the following tested applications.

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

  • Applications



    Functional Studies

  • Form

  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Store at -20°C or -80°C. Avoid freeze / thaw cycle.

    pH: 7.5
    Constituents: 0.61% Tris, 0.75% Glycine, 5% Trehalose

    This product is an active protein and may elicit a biological response in vivo, handle with caution.

  • Reconstitution
    Reconstitute the lyophilized product in sterile deionized water to a final concentration of 1 mg/ml. Solubilize for 30 to 60 minutes at room temperature with occasional gentle mixing. Carrier protein (0.1% HSA or BSA) is strongly recommended for further dilution and long term storage.

General Info

  • Alternative names

    • Signal regulatory protein alpha type 1
    • Bit
    • Brain Ig like molecule with tyrosine based activation motifs
    • Brain Ig-like molecule with tyrosine-based activation motifs
    • Brain immunoglobulin like molecule with tyrosine based activation motifs
    • CD172 antigen like family member A
    • CD172 antigen-like family member A
    • CD172a
    • CD172a antigen
    • Inhibitory receptor SHPS-1
    • Macrophage fusion receptor
    • MFR
    • MYD 1
    • Myd 1 antigen
    • MyD-1 antigen
    • p84
    • Protein tyrosine phosphatase non receptor type substrate 1
    • PTPNS1
    • SHP substrate 1
    • SHPS-1
    • SHPS1
    • Signal regulatory protein alpha
    • Signal regulatory protein alpha 2
    • Signal regulatory protein alpha 3
    • Signal regulatory protein alpha type 2
    • Signal-regulatory protein alpha-1
    • Signal-regulatory protein alpha-2
    • Signal-regulatory protein alpha-3
    • SIRP
    • Sirp-alpha-1
    • Sirp-alpha-2
    • Sirp-alpha-3
    • SIRPA
    • SIRPalpha
    • SIRPalpha1
    • SIRPalpha2
    • SIRPalpha3
    • Tyrosine phosphatase SHP substrate 1
    • Tyrosine protein phosphatase non receptor type substrate 1
    • Tyrosine-protein phosphatase non-receptor type substrate 1
    see all
  • Function

    Immunoglobulin-like cell surface receptor for CD47. Acts as docking protein and induces translocation of PTPN6, PTPN11 and other binding partners from the cytosol to the plasma membrane. Supports adhesion of cerebellar neurons, neurite outgrowth and glial cell attachment. May play a key role in intracellular signaling during synaptogenesis and in synaptic function (By similarity). Involved in the negative regulation of receptor tyrosine kinase-coupled cellular responses induced by cell adhesion, growth factors or insulin. 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.
  • Tissue specificity

    Ubiquitous. Highly expressed in brain. Detected on myeloid cells, but not T-cells. Detected at lower levels in heart, placenta, lung, testis, ovary, colon, liver, small intestine, prostate, spleen, kidney, skeletal muscle and pancreas.
  • Sequence similarities

    Contains 2 Ig-like C1-type (immunoglobulin-like) domains.
    Contains 1 Ig-like V-type (immunoglobulin-like) domain.
  • Post-translational

    Phosphorylated on tyrosine residues in response to stimulation with EGF, growth hormone, insulin and PDGF. Dephosphorylated by PTPN11.
  • Cellular localization

  • Information by UniProt


  • Human SIRP alpha, Mouse IgG1 Fc 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, Mouse IgG1 Fc Tag (HPLC-verified) was greater than 90% as determined by SEC-HPLC.
  • FACS analysis shows that the binding of Human SIRP alpha, mouse IgG1 Fc Tag (HPLC-verified) to Jurkat expressing CD47 was inhibited by increasing concentration of neutralizing anti-CD47 antibody. The concentration of SIRP alpha used is 0.3 µg/ml. IC50=0.1318 µg/ml.
  • FACS assay shows that recombinant Human SIRP alpha, mouse IgG1 Fc Tag (HPLC-verified) can bind to Jurkat cell expressing CD47. The concentration of SIRP alpha used is 0.3 µg/ml.
  • SDS-PAGE (DTT reduced) analysis of ab221342 followed by staining overnight with Coomassie Blue. The protein migrates as 70-105 kDa on a SDS-PAGE gel under reducing conditions due to glycosylation.

  • Immobilized Human CD47, His Tag at 2 μg/mL can bind ab221342 with a linear range of 8-250 ng/mL.


ab221342 has not yet been referenced specifically in any publications.

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