Recombinant Human SIRPA protein derived from E.coli
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Product Description
Specifications
| Size | 10 µg, 50 µg, 100 µg |
| Estimated Lead Time | 1-2 business days |
| Species | Human |
| Accession Number | P78324 |
| Gene Id | 140885 |
| Gene Symbols | BIT, MFR, MYD1, PTPNS1, SHPS1, SIRP, SIRPA |
| Protein Name / Synonyms | Tyrosine-protein phosphatase non-receptor type substrate 1 (SHP substrate 1) (SHPS-1) (Brain Ig-like molecule with tyrosine-based activation motifs) (Bit) (CD172 antigen-like family member A) (Inhibitory receptor SHPS-1) (Macrophage fusion receptor) (MyD-, Signal-Regulatory Protein Alpha, SHPS1, CD172 Antigen-Like Family Member A, Inhibitory Receptor SHPS-1, Macrophage Fusion Receptor, PTPNS1, SIRP, P84, BIT,MFR, Brain-Immunoglobulin-Like Molecule With Tyrosine-Based Activation Motifs, Brain Ig-Like Molecule With Tyrosine-Based Activation Motifs, Protein Tyrosine Phosphatase, Non-Receptor Type Substrate 1, Tyrosine-Protein Phosphatase Non-Receptor Type Substrate 1, Tyrosine Phosphatase SHP Substrate 1Signal-Regulatory Protein Alpha-1, Signal-Regulatory Protein Alpha-2, Signal-Regulatory Protein Alpha-3, SHP Substrate 1, CD172a Antigen, Myd-1 Antigen, MyD-1 Antigen, Sirp-Alpha-1, Sirp-Alpha-2, Sirp-Alpha-3, CD172A, SHPS-1, MYD-1, MYD1. |
| Expressed Region | Glu31-Ile373 |
| Expression System | E. coli |
| Tag | N-terminal histidine tag |
| Purity | >90% |
| Purity Determined By | SDS-PAGE under reducing conditions and visualized by Coomassie blue staining |
| Molecular Weight (kDa) | 40 kDa |
| Format | Liquid |
| Formulation | Supplied as a 0.45 µm filtered solution in 50 mM Na2HPO4 (pH 7.4), 0.5 M NaCl, 240 mM imidazole, 6 M urea. |
| Concentration (lot specific) | Lot specific (see the label on the vial), determined by Bio-Rad protein assay dye reagent concentrate. |
| Preservative | None |
| Endotoxin Level | Not determined |
| Research Area | Cancer, Inflammation |
| Shipping Type | Blue ice |
| Storage | -20°C |
SDS-PAGE Image
Activity
Measured by its binding ability in a functional ELISA. Immobilized recombinant SIRPa can bind CD47-Fc with EC50 at 12.98 ng/mL.
Storage/Stability
Upon arrival, the protein may be stored for 2 weeks at 4 °C. For long term storage, it is recommended to store at -20 °C or -80 °C in appropriate aliquots. Avoid repeated freeze-thaw cycles.
Disclaimer
"Antigen Grade" is not a formally regulated industry standard, but it is commonly used to indicate that a protein is intended for antigen-based applications rather than functional assays.
Antigen Grade proteins are recombinant proteins purified under denaturing conditions (e.g., in urea) and may not retain their native conformation or biological activity. These proteins are suitable for antigen-based applications such as antibody generation, ELISA plate coating, Western blotting, and other immunological assays, but are not recommended for functional or activity assays.
Suitable Applications:
✔ Antibody production (immunogen)✔ ELISA coating antigen
✔ Western blot positive control
✔ Dot blot
✔ Epitope mapping
✔ Antibody screening, etc.
Not Recommended:
✘ Enzyme activity assays✘ Ligand-receptor binding assays (unless validated)
✘ Cell-based functional assays
✘ SPR/BLI kinetic studies requiring native folding
Why "Antigen Grade"?
Many bacterial proteins expressed as inclusion bodies are purified in 6–8 M urea. Although they can often be refolded, proteins sold in urea are generally not guaranteed to be correctly refolded or biologically active. "Antigen Grade" proteins are suitable for immunological applications but may not be appropriate for assays requiring native protein function.