Recombinant Mouse SIRP alpha/CD172a Fc Chimera Protein, CF

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Recombinant Mouse SIRP alpha/CD172a Fc Chimera Protein Bioactivity
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Recombinant Mouse SIRP alpha/CD172a Fc Chimera Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by the ability of the immobilized protein to support the adhesion of mouse red blood cells.

The ED50 for this effect is 0.4-1.6 μg/mL.

Optimal dilutions should be determined by each laboratory for each application.

Mouse myeloma cell line, NS0-derived mouse SIRP alpha/CD172a protein
Mouse SIRP alpha /CD172a
(Met1-Asn373) (Gly365Asp)
Accession # P97797
N-terminus C-terminus
Accession #
N-terminal Sequence
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
65.1 kDa (monomer)
115-125 kDa, reducing conditions

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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.


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.

Scientific Data

Bioactivity Recombinant Mouse SIRP alpha/CD172a Fc Chimera Protein Bioactivity View Larger

Recombinant Mouse SIRP alpha /CD172a Fc Chimera (Catalog # 7154-SA) supports the adhesion of mouse red blood cells. The ED50 for this effect is 0.4‑1.6 µg/mL.

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Background: SIRP alpha/CD172a

Signal regulatory protein alpha (SIRP alpha, designated CD172a), also called SHPS-1 (SHP substrate 1) and previously, MyD-1 (Myeloid/Dendritic-1), is a homodimeric, 100-105 kDa type I transmembrane glycoprotein that belongs to the SIRP/SHPS (CD172) family of the immunoglobulin superfamily (1-5). SIRPs are paired receptors, with similar extracellular domains but differing C-termini and functions (1, 2). The 513 amino acid (aa) mouse SIRP alpha contains a 342 aa extracellular domain (ECD) with one V‑type and two C1 type Ig domains and many potential N‑glycosylation sites. It has a 117 aa cytoplasmic sequence with ITIM motifs that recruit tyrosine phosphatases SHP-1 and SHP-2 when phosphorylated (4). Mouse and human SIRP alpha have at least 30 described polymorphisms, including the human SIRP alpha prominent variant BIT (Brain Ig like molecule with Tyrosine-based activation motifs, also called SIRP alpha 2 or PTPNS) (2). In mouse, one splice variant lacks aa 147-364, which eliminates the C type Ig domains, while another lacks only aa 425-428 (6). Mouse SIRP alpha ECD shares 61%, 75%, 62%, 61%, and 59% aa sequence identity with human, rat, equine, bovine, and porcine SIRP alpha, respectively, and shares 62% aa identity with mouse SIRP beta 1 (2). SIRP alpha is expressed mainly on myeloid cells, including macrophages, neutrophils, dendritic and Langerhans cells (3 ‑ 7). It is also found on neurons, smooth muscle and endothelial cells (8-10). SIRP alpha shows adhesion to the ubiquitous CD47/IAP (integrin associated protein), while SIRP gamma binds more weakly and SIRP beta 1 does not bind at all (1, 2). Mouse and human SIRP alpha are allelic in nature, and variation(s) in the V-type Ig-like domain likely impacts its binding to CD47 (11). SIRP alpha engagement generally produces a negative regulatory signal (4). Low SIRP alpha recognition of CD47, which occurs on aged erythrocytes or platelets or xenogenic cells, promotes clearance of CD47low cells from circulation (12 ‑ 14). SIRP alpha recognition of surfactants SP‑A and SP‑D in the lung can inhibit alveolar macrophage cytokine production (15). The CD47 integrin-SIRP alpha interaction is reported to promote macrophage fusion during osteoclastogenesis (16).

  1. Barclay, A.N. (2009) Curr. Opin. Immunol. 21:47.
  2. van Beek, E.M. et al. (2005) J. Immunol. 175:7781.
  3. Liu, Y. et al. (2005) J. Biol. Chem. 280:36132.
  4. Sano, S-I. et al. (1999) Biochem. J. 344:667.
  5. Lee, W.Y. et al. (2010) J. Biol. Chem. 285:37953.
  6. Swissprot Accession # P97797.
  7. Miyashita, M. et al. (2004) Mol. Biol. Cell 15:3950.
  8. Wang, X.X. & K.H. Pfenninger (2005) J. Cell Sci. 119:172.
  9. Maile, L.A. et al. (2003) Mol. Biol. Cell 14:3519.
  10. Johansen, M.L. & E.J. Brown (2007) J. Biol. Chem. 282:24219.
  11. Takenaka, K. et al. (2007) Nat. Immunol. 8:1313.
  12. Ishikawa-Sekigami, T. et al. (2006) Biochem. Biophys. Res. Commun. 343:1197.
  13. Olsson, M. et al. (2005) Blood 105:3577.
  14. Ide, K. et al. (2007) Proc. Natl. Acad. Sci. USA 104:5062.
  15. Gardai, S.J. et al. (2003) Cell 115:13.
  16. Lundberg, P. et al. (2007) Biochem. Biophys. Res. Commun. 352:444.
Long Name
Signal-regulatory Protein alpha
Entrez Gene IDs
140885 (Human); 19261 (Mouse); 25528 (Rat); 494566 (Porcine); 609452 (Canine); 101926317 (Cynomolgus Monkey)
Alternate Names
BIT; BITbrain-immunoglobulin-like molecule with tyrosine-based activation motifs; Brain Ig-like molecule with tyrosine-based activation motifs; CD172 antigen-like family member A; CD172a antigen; CD172a; Inhibitory receptor SHPS-1; Macrophage fusion receptor; MFR; MFRtyrosine phosphatase SHP substrate 1; MyD-1 antigen; MYD1; MYD-1; P84; protein tyrosine phosphatase, non-receptor type substrate 1; PTPNS1; SHP substrate 1; SHPS1; SHPS-1; SHPS1CD172A; signal-regulatory protein alpha; Signal-regulatory protein alpha-1; Signal-regulatory protein alpha-2; Signal-regulatory protein alpha-3; SIRP alpha; SIRPA; SIRPalpha; Sirp-alpha-1; SIRPalpha2; Sirp-alpha-2; Sirp-alpha-3; SIRPtyrosine-protein phosphatase non-receptor type substrate 1

Citation for Recombinant Mouse SIRP alpha/CD172a Fc Chimera Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Increased lymphocyte activation and atherosclerosis in CD47-deficient mice
    Authors: D Engelberts, A Autio, RAF Verwillige, MAC Depuydt, G Newton, S Rattik, E Levinsohn, G Saggu, P Jarolim, H Wang, F Velazquez, AH Lichtman, FW Luscinskas
    Sci Rep, 2019;9(1):10608.
    Species: Mouse
    Sample Types: Whole Cells
    Applications: Cell Culture


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