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Human Siglec-3/CD33 Protein 4512

$240.00$800.00

Summary

  • Expression: HEK293
  • Functional: Yes (ELISA)
  • Amino Acid Range: Asp18-His259
Weight1 lbs
Dimensions9 × 5 × 2 in
accession

P20138

express system

HEK293

product tag

C-His-Avi

purity

> 95% as determined by Tris-Bis PAGE; > 95% as determined by HPLC

background

Sialic-acid-binding immunoglobulin-like lectin (Siglec) that plays a role in mediating cell-cell interactions and in maintaining immune cells in a resting state.They are sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a) and Siglecs 5 to 11. To date, no Siglec has been shown to recognized any cell surface ligand other than sialic acids, suggesting that interactions with glycans containing this carbohydrate are important in mediating the biological functions of Siglecs.

molecular weight

The protein has a predicted MW of 29.6 kDa. Due to glycosylation, the protein migrates to 52-60 kDa based on Tris-Bis PAGE result.

available size

100 µg, 500 µg

endotoxin

Less than 1 EU per μg by the LAL method.

Human Siglec-3/CD33 Protein 4512

protein
Size and concentration
100, 500µg and lyophilized
Form
Lyophilized
Storage Instructions
Valid for 12 months from date of receipt when stored at -80°C. Recommend to aliquot the protein into smaller quantities for optimal storage. Please minimize freeze-thaw cycles.
Storage buffer
Shipped at ambient temperature.
Purity
> 95% as determined by Tris-Bis PAGE
target relevance
Sialic-acid-binding immunoglobulin-like lectin (Siglec) that plays a role in mediating cell-cell interactions and in maintaining immune cells in a resting state.They are sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a) and Siglecs 5 to 11. To date, no Siglec has been shown to recognized any cell surface ligand other than sialic acids, suggesting that interactions with glycans containing this carbohydrate are important in mediating the biological functions of Siglecs.
Protein names
Myeloid cell surface antigen CD33 (Sialic acid-binding Ig-like lectin 3) (Siglec-3) (gp67) (CD antigen CD33)
Gene names
CD33,CD33 SIGLEC3
Protein family
Immunoglobulin superfamily, SIGLEC (sialic acid binding Ig-like lectin) family
Mass
9606Da
Function
FUNCTION: Sialic-acid-binding immunoglobulin-like lectin (Siglec) that plays a role in mediating cell-cell interactions and in maintaining immune cells in a resting state (PubMed:10611343, PubMed:11320212, PubMed:15597323). Preferentially recognizes and binds alpha-2,3- and more avidly alpha-2,6-linked sialic acid-bearing glycans (PubMed:7718872). Upon engagement of ligands such as C1q or syalylated glycoproteins, two immunoreceptor tyrosine-based inhibitory motifs (ITIMs) located in CD33 cytoplasmic tail are phosphorylated by Src-like kinases such as LCK (PubMed:10887109, PubMed:28325905). These phosphorylations provide docking sites for the recruitment and activation of protein-tyrosine phosphatases PTPN6/SHP-1 and PTPN11/SHP-2 (PubMed:10206955, PubMed:10556798, PubMed:10887109). In turn, these phosphatases regulate downstream pathways through dephosphorylation of signaling molecules (PubMed:10206955, PubMed:10887109). One of the repressive effect of CD33 on monocyte activation requires phosphoinositide 3-kinase/PI3K (PubMed:15597323). {ECO:0000269|PubMed:10206955, ECO:0000269|PubMed:10556798, ECO:0000269|PubMed:10611343, ECO:0000269|PubMed:10887109, ECO:0000269|PubMed:11320212, ECO:0000269|PubMed:15597323, ECO:0000269|PubMed:28325905, ECO:0000269|PubMed:7718872}.
Subellular location
SUBCELLULAR LOCATION: [Isoform CD33M]: Cell membrane {ECO:0000269|PubMed:10611343, ECO:0000269|PubMed:28747436}; Single-pass type I membrane protein.; SUBCELLULAR LOCATION: [Isoform CD33m]: Peroxisome {ECO:0000269|PubMed:28747436}. Note=CD33m isoform does not localize to cell surfaces but instead accumulates in peroxisomes. {ECO:0000269|PubMed:28747436}.
Tissues
TISSUE SPECIFICITY: Monocytic/myeloid lineage cells. In the brain, CD33 is mainly expressed on microglial cells.
Structure
SUBUNIT: Homodimer; disulfide-linked (PubMed:10887109). Interacts with PTPN6/SHP-1 and PTPN11/SHP-2 upon phosphorylation (PubMed:10206955, PubMed:10556798). Interacts with C1QA (via C-terminus); this interaction activates CD33 inhibitory motifs (PubMed:28325905). {ECO:0000269|PubMed:10206955, ECO:0000269|PubMed:10556798, ECO:0000269|PubMed:10887109, ECO:0000269|PubMed:28325905}.
Post-translational modification
PTM: Glycosylated. Glycosylation at Asn-100 is critical for regulating ligand recognition. {ECO:0000269|PubMed:8702538}.; PTM: Phosphorylation of Tyr-340 is involved in binding to PTPN6 and PTPN11. Phosphorylation of Tyr-358 is involved in binding to PTPN6. LCK phosphorylates Tyr-340 efficiently and Tyr-358 to a lesser extent. {ECO:0000269|PubMed:10206955, ECO:0000269|PubMed:10556798, ECO:0000269|PubMed:10887109}.
Domain
DOMAIN: Co
Target Relevance information above includes information from UniProt accession : P20138
The UniProt Consortium

Data

ELISA with Human Siglec-3/CD33 Protein
Immobilized Human Siglec-3, His Tag at 1 µg/ml (100 µl/Well) on the plate. Dose response curve for Anti-Siglec-3 Antibody, hFc Tag with the EC50 of 3.4 ng/ml determined by ELISA.
HPLC of Human Siglec-3/CD33 Protein
The purity of Human Siglec-3 is greater than 95% as determined by SEC-HPLC.
SDS-PAGE gel of Human Siglec-3/CD33 Protein
Human Siglec-3 on Tris-Bis PAGE under reduced condition. The purity is greater than 95%.

Publications

Published literature highly relevant to the biological target of this product and referencing this antibody or clone are retrieved from PubMed database provided by The United States National Library of Medicine at the National Institutes of Health.




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