ELISA with Human Siglec-3/CD33 Protein 4512

Human Siglec-3/CD33 Protein 4512

$240.00 – $800.00

Summary

Expression: HEK293
Functional: Yes (ELISA)
Amino Acid Range: Asp18-His259

SKU: 4512parent Categories: proteins, Recombinant proteins Tag: active proteins

Weight	1 lbs
Dimensions	9 × 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 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).
Subellular location [Isoform CD33M]: Cell membrane ; Single-pass type I membrane protein.; [Isoform CD33m]: Peroxisome. Note=CD33m isoform does not localize to cell surfaces but instead accumulates in peroxisomes.
Tissues Monocytic/myeloid lineage cells. In the brain, CD33 is mainly expressed on microglial cells.
Structure 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).
Post-translational modification Glycosylated. Glycosylation at Asn-100 is critical for regulating ligand recognition.; 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.
Domain Co
Target Relevance information above includes information from UniProt accession: P20138
The UniProt Consortium

Data

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.

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.