Name: Recombinant Human Tyrosine-protein phosphatase non-receptor type substrate 1 (SIRPA), partial (Active)
Brand: CUSABIO
SKU: CSB-MP021334HU
Price: $102 USD
Availability: InStock
Rating: 5.0 (1 reviews)

Product Details

Purity

Greater than 95% as determined by SDS-PAGE.

Endotoxin

Less than 1.0 EU/ug as determined by LAL method.

Activity

①Measured by its binding ability in a functional ELISA. Immobilized SIRPA at 2 μg/ml can bind human CD47(CSB-MP004940HU), the EC₅₀ of human SIRPA protein is 58.30-85.04 ng/ml.②Human SIRPA protein His/Myc tag (CSB-MP021334HU) captured on COOH chip can bind Human CD47 protein Fc tag (CSB-MP004940HU) with an affinity constant of 19.1 nM as detected by LSPR Assay.

Target Names

SIRPA

Uniprot No.

P78324

Research Area

Cancer

Alternative Names

Brain Ig-like molecule with tyrosine-based activation motifs (Bit) (CD172 antigen-like family member A) (Inhibitory receptor SHPS-1) (Macrophage fusion receptor) (MyD-1 antigen) (Signal-regulatory protein alpha-1) (Sirp-alpha-1) (Signal-regulatory protein alpha-2) (Sirp-alpha-2) (Signal-regulatory protein alpha-3) (Sirp-alpha-3) (p84) (CD_antigen: CD172a) (SHP substrate 1) (SHPS-1) (BIT) (MFR) (MYD1) (PTPNS1) (SHPS1) (SIRP)

Molecular Characterization

Species

Homo sapiens (Human)

Source

Mammalian cell

Expression Region

31-370aa

Target Protein Sequence

EEELQVIQPDKSVLVAAGETATLRCTATSLIPVGPIQWFRGAGPGRELIYNQKEGHFPRVTTVSDLTKRNNMDFSIRIGNITPADAGTYYCVKFRKGSPDDVEFKSGAGTELSVRAKPSAPVVSGPAARATPQHTVSFTCESHGFSPRDITLKWFKNGNELSDFQTNVDPVGESVSYSIHSTAKVVLTREDVHSQVICEVAHVTLQGDPLRGTANLSETIRVPPTLEVTQQPVRAENQVNVTCQVRKFYPQRLQLTWLENGNVSRTETASTVTENKDGTYNWMSWLLVNVSAHRDDVKLTCQVEHDGQPAVSKSHDLKVSAHPKEQGSNTAAENTGSNER

Mol. Weight

41.8 kDa

Protein Length

Partial

Tag Info

C-terminal 6xHis-Myc-tagged

Form

Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.

Buffer

If the delivery form is liquid, the default storage buffer is Tris/PBS-based buffer, 5%-50% glycerol.
Note: If you have any special requirement for the glycerol content, please remark when you place the order.
If the delivery form is lyophilized powder, the buffer before lyophilization is Tris/PBS-based buffer, 6% Trehalose.

Reconstitution

We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20°C/-80°C. Our default final concentration of glycerol is 50%. Customers could use it as reference.

Troubleshooting and FAQs

Protein FAQs

Storage Condition

Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.

Shelf Life

The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.

Lead Time

3-7 business days

Notes

Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.

Datasheet & COA

Please contact us to get it.

Description

SIRPα is a critical immune checkpoint receptor whose interaction with CD47 delivers a "don't eat me" signal that enables tumor immune evasion, making precise characterization of this axis essential for immuno-oncology drug discovery. This recombinant human SIRPα construct covers the extracellular domain (aa 31–370), encompassing the IgV-like ligand-binding region, and is expressed in mammalian cells to preserve native glycosylation and conformational integrity required for faithful receptor-ligand studies. Validated binding to human CD47 by functional ELISA (EC50 of 58.30–85.04 ng/ml) and by LSPR with a KD of 19.1 nM confirms that this protein supports use in SPR/BLI affinity characterization, competitive blocking antibody screening, therapeutic antibody epitope mapping, and small-molecule inhibitor discovery targeting the SIRPα–CD47 checkpoint. Purity exceeding 95% by SDS-PAGE combined with endotoxin levels below 1.0 EU/μg satisfies the criteria typical for cell-based immune checkpoint assays and as a reliable positive control in binding experiments.

Customer Reviews and Q&A

■ Customer Reviews

Average Rating:

5.0 - 1 reviews

Submit a Review here

Applications : Binding assay/Protein-protein interaction

Review: We purchased SIRPA-biotin and CD47 (CSB-MP004940HU) for functional ELISA experiments, the results showed that it had good binding activity, and subsequently successfully established a stable binding test system. It\'s available in stock, has fast delivery, convenient procurement, good product activity, and stable performance, and we will continue to purchase in large quantities!

By Anonymous

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Target Background

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. 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.

Gene References into Functions

Accumulation of SIRPalpha-inhibited macrophages in tumors favored tumor regression for 1-2 weeks, but donor macrophages quickly differentiated toward non-phagocytic, high-SIRPalpha TAMs. PMID: 28669759
SIRP alpha protein is under-expressed in low and high-grades of astrocytoma from patients' brain samples. PMID: 27900675
Anti-SIRPA antibody immunotherapy enhances neutrophil and macrophage antitumor activity. PMID: 29158380
SIRPalpha might play an important role in the progression of oral leukoplakia and oral cancer, and could be a pivotal therapeutic target in oral squamous cell carcinoma, regulating the phenotype of macrophages via targeting NF-kappaB signaling. PMID: 27793032
TTI-621 (SIRPalphaFc) is a fully human recombinant fusion protein that blocks the CD47-SIRPalpha axis by binding to human CD47 and enhancing phagocytosis of malignant cells..These data indicate that TTI-621 is active across a broad range of human tumors. PMID: 27856600
data suggest that TTI-621 may be efficacious in triggering the destruction of cancer cells by a diverse population of TAMs found in vivo and support possible combination approaches to augment the activity of CD47 blockade PMID: 29084248
CD47, TSP1, and to a lesser extent SIRPalpha facilitate exosome-mediated myeloid-derived suppressor cells chemotaxis and migration. PMID: 27728760
exploited by Hepatitis E virus to negative regulated IFN-beta of the host innate immune system to promote viral infection PMID: 26492885
Data suggest a reduction in the CD47 antigen/signal-regulatory protein alpha (SIRPalpha) pathway by programmed cell death protein 1 (PD-1) blockade, which regulates Myeloid-derived suppressor cells (MDSCs) and tumor associated macrophages (TAMs). PMID: 26573233
agents that block the CD47:SIRP-alpha engagement are attractive therapeutic targets as a monotherapy or in combination with additional immune-modulating agents for activating antitumor T cells in vivo PMID: 26116271
the data suggest that combinatorial actions of ADAM10 and gamma-secretase on SIRPalpha cleavage promote inflammatory signaling. PMID: 26534964
Loss of cell surface CD47 clustering formation and binding avidity to SIRPalpha facilitate apoptotic cell clearance by macrophages. PMID: 26085683
Velcro" engineering of high affinity CD47 ectodomain as signal regulatory protein alpha (SIRPalpha) antagonists that enhance antibody-dependent cellular phagocytosis PMID: 25837251
negatively regulates neutrophil accumulation during inflammation PMID: 24516072
Combinatorial expression of NKX2-5, SIRPA, VCAM1 and CD34 can be used to define discrete stages of cardiovascular cell lineage differentiation. PMID: 24968096
These results suggest that thrombospondin-1 binding to SIRP-alpha on nonphagocytic cells activates NADPH oxidase, limits vasodilation, and promotes renal ischemia reperfusion injury. PMID: 24511121
'clustering' SIRPalpha into plasma membrane microdomains is essential for activated monocytes and macrophages to effectively interact with CD47 and initiate intracellular signaling PMID: 24143245
Polymorphisms in the human inhibitory signal-regulatory protein alpha do not affect binding to its ligand CD47. PMID: 24550402
SIRPA plays a protective role in cardiac hypertrophy through negative regulation of the Toll-like receptor 4/nuclear factor-kappaB pathway. PMID: 24101669
These results demonstrate a SIRPalpha-based mechanism that dynamically regulates polymorphonuclear leukocyte inflammatory responses. PMID: 24026300
Signal regulatory protein alpha is associated with tumor-polarized macrophages phenotype switch and plays a pivotal role in tumor progression. PMID: 23504854
An avidity-improved CD47 fusion protein (CD47-Var1) suppresses the release of a wide array of inflammatory cytokines by CD172a(+) cells. PMID: 23669395
Expression of SIRPalpha on two low SIRPalpha acute myeloid leukemia (AML) expressing cell lines could be upregulated upon differentiation of the cells. PMID: 23320069
SHPS-1 negatively regulates the MyD88-dependent TLR signaling pathway through the inhibition of NF-kappaB activation PMID: 23314616
IFN-beta and IFN-gamma/TNF-alpha decrease erythrophagocytosis by human monocytes in vitro, and this effect does not apparently require an increase in SIRP-alpha or SHP-1 expression. PMID: 22738830
neutrophils reduce their SIRPalpha expression during apoptosis, which may be part of the functional down-regulation seen in apoptotic neutrophils. PMID: 23271705
thymic Sirpalpha(+) cDCs crucially contribute to a process of intrathymic tumor immune tolerance that involves CCR2 and CCL2 PMID: 22815949
In the glomeruli of CNS patients carrying mutations in NPHS1, where SD formation is disrupted, the expression of SIRPalpha as well as Neph1 and nephrin was significantly decreased, indicating that SIRPalpha is closely associated with the nephrin complex PMID: 22747997
Surfactant protein D (Sp-D) binds to membrane-proximal domain (D3) of signal regulatory protein alpha (SIRPalpha), a site distant from binding domain of CD47, while also binding to analogous region on signal regulatory protein beta (SIRPbeta). PMID: 22511785
SIRPalpha1 in hepatic sinusoid Kupffer cells is associated with the extent of autoimmune hepatitis. PMID: 22409853
data, taken together with similar findings with other human neoplasms, show that CD47 is a commonly expressed molecule on all cancers, its function to block phagocytosis is known, and blockade of its function leads to tumor phagocytosis and elimination PMID: 22451913
SIRPalpha/CD172a and FHOD1 are unique markers of littoral cells, a recently evolved major cell population of red pulp of human spleen. PMID: 22490440
Sensing of cell surface CD47 expression by phagocyte SIRPalpha is a critical determinant of T- and natural killer-cell homeostasis under steady-state conditions in vivo. PMID: 21788504
hSIRPa-transgenic Rag2(-/-)gamma(c)(-/-) mice represent a unique mouse strain supporting high levels of human cell engraftment. PMID: 21788509
The prolactin receptor (PRLr)-SIRPalpha-integrin complex provides a basis for integrin-PRLr cross-talk that contributes to the biology of breast cancer. PMID: 20826546
the relationships between SIRPalpha1 and beta-catenin in leukemia cells. PMID: 21369691
Single Nucleotide Polymorphisms in PTPNS1 is associated with inflammatory bowel disease. PMID: 21225905
SHP-2 as an essential component of tumor suppression and anoikis mediated by SIRPalpha1 in human breast carcinoma cells as well as in v-Src-transformed cells. PMID: 21169408
Poor prognosis of breast cancer patients with high expression of CD47 is due to an active CD47/SIRPA signaling pathway in circulating cells. PMID: 20705613
The role of cis dimerization of signal regulatory protein alpha (SIRPalpha) in binding to CD47. PMID: 20826801
Findings reveal a novel mechanism for recruitment of PDK1 to the SHPS-1 signaling complex, which is required for IGF-I-stimulated AKT Thr(308) phosphorylation and inhibition of apoptosis. PMID: 20643654
Inhibition of engulfment correlates with affinity of CD47 for SIRPA - but only at low levels of CD47. PMID: 20299253
SIRPalpha1 specifically affects the SHP-2/FAK/Grb2/Sos-1/MAPK activation loop to downmodulate EGFRvIII-mediated migration and transformation. PMID: 20473329
Insulin-like growth factor-I-stimulated insulin receptor substrate-1 negatively regulates Src homology 2 domain-containing protein-tyrosine phosphatase substrate-1 function in vascular smooth muscle cells. PMID: 20207740
SIRP alpha gene expression is higher in monocytes from autoimmune hemolytic anemia patients, compared with basal expression. PMID: 19874234
CD47/SIRP-alpha interactions are implicated in the pathogenesis of DC-driven allergic airway inflammation. PMID: 19748659
Signal regulatory protein (SIRPalpha), a cellular ligand for CD47, regulates neutrophil transmigration PMID: 11792697
The interaction of SHPS-1 with CD47 may contribute to the recruitment of B lymphocytes via endothelial cells under steady state conditions. PMID: 11907074
MyD-1-coupling to this PI 3-kinase-dependent signaling pathway may therefore present a novel target for the development of therapeutic strategies for combating TNFalpha production and consequent inflammatory disease. PMID: 12805067
Expression of SIRPalpha1 on astrocytomas may be of considerable importance in brain tumor biology. PMID: 14729615

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Subcellular Location

Membrane; Single-pass type I membrane protein.

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.

Database Links

HGNC: 9662

OMIM: 602461

KEGG: hsa:140885

STRING: 9606.ENSP00000348307

UniGene: Hs.581021

Code	CSB-MP021334HU
Abbreviation	Recombinant Human SIRPA protein, partial (Active)
MSDS	MSDS Datasheet
Size	$9.9
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Image	(Tris-Glycine gel) Discontinuous SDS-PAGE (reduced) with 5% enrichment gel and 15% separation gel. Activity Measured by its binding ability in a functional ELISA. Immobilized SIRPA at 2 μg/ml can bind human CD47(CSB-MP004940HU), the EC₅₀ of human SIRPA protein is 58.30-85.04 ng/ml. Biological Activity Assay Human SIRPA protein His/Myc tag (CSB-MP021334HU) captured on COOH chip can bind Human CD47 protein Fc tag (CSB-MP004940HU) with an affinity constant of 19.1 nM as detected by LSPR Assay. Biological Activity Assay
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Recombinant Human Tyrosine-protein phosphatase non-receptor type substrate 1 (SIRPA), partial (Active)

Product Details

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Target Background

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