Human Siglec-3/CD33 Antibody

Catalog # Availability Size / Price Qty
MAB1137-SP
MAB1137-100
MAB1137-500
Detection of Siglec-3/CD33 in Human Blood Granulocytes by Flow Cytometry.
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Citations (1)
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Human Siglec-3/CD33 Antibody Summary

Species Reactivity
Human
Specificity
Detects human Siglec‑3/CD33 in direct ELISAs and Western blots. In direct ELISAs and Western blots, no cross-reactivity with recombinant human Siglec-2, -5, -7, or -9 is observed.
Source
Monoclonal Mouse IgG1 Clone # 6C5/2
Purification
Protein A or G purified from hybridoma culture supernatant
Immunogen
Recombinant human Siglec‑3/CD33
Extracellular domain
Formulation
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
Label
Unconjugated

Applications

Recommended Concentration
Sample
Western Blot
1 µg/mL
Recombinant Human Siglec-3/CD33 Fc Chimera (Catalog # 1137-SL) under non-reducing conditions only
Flow Cytometry
0.25 µg/106 cells
See below
CyTOF-ready
Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.
 

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Data Example

Flow Cytometry Detection of Siglec-3/CD33 in Human Blood Granulocytes by Flow Cytometry. View Larger

Detection of Siglec-3/CD33 in Human Blood Granulocytes by Flow Cytometry. Human peripheral blood granulocytes were stained with Mouse Anti-Human Siglec-3/CD33 Monoclonal Antibody (Catalog # MAB1137, filled histogram) or isotype control antibody (Catalog # MAB002, open histogram) followed by anti-Mouse IgG PE-conjugated secondary antibody (Catalog # F0102B). View our protocol for Staining Membrane-associated Proteins.

Reconstitution Calculator

Reconstitution Calculator

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Preparation and Storage

Reconstitution
Reconstitute at 0.5 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Availability
Size / Price
Qty
RB01
Shipping
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
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.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Siglec-3/CD33

Siglecs (sialic acid binding Ig-like lectins) are I-type (Ig-type) lectins belonging to the Ig superfamily. They are characterized by an N‑terminal Ig-like V-type domain which mediates sialic acid binding, followed by varying numbers of Ig-like C2-type domains (1, 2). Eleven human Siglecs have been cloned and characterized. They are sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a) and Siglecs 5 to 11 (1‑3). 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. Siglecs 5 to 11 share a high degree of sequence similarity with CD33/Siglec-3 both in their extracellular and intracellular regions. They are collectively referred to as CD33-related Siglecs. One remarkable feature of the CD33-related Siglecs is their differential expression pattern within the hematopoietic system (1, 2). This fact, together with the presence of two conserved immunoreceptor tyrosine-based inhibition motifs (ITIMs) in their cytoplasma tails, suggests that CD33-related Siglecs are involved in the regulation of cellular activation within the immune system.

Human Siglec-3 is alternatively known as myeloid cell surface antigen CD33 and GP67. Human Siglec-3 cDNA encodes a 364 amino acid (aa) polypeptide with a hydrophobic signal peptide, an N-terminal Ig-like V-type domain, one Ig-like C2-type domains, a transmembrane region and a cytoplasmic tail (1, 4). Siglec-3 expression is restricted to cells of myelomonocytic lineage (2). It binds sialic acid preferring alpha 2,3- linkage over alpha 2,6- linkage (5). Studies indicated that Siglec-3 recruits SHP-1 and SHP-2 to its ITIMs (6, 7). When co-crosslinking with Fc gamma R1, Siglec-3 inhibits tyrosine phosphorylation and calcium mobilization, suggesting Siglec-3 can mediate inhibitory signals (7).

References
  1. Crocker, P.R. and A. Varki (2001) Trends Immunol. 22:337.
  2. Crocker, P.R. and A. Varki (2001) Immunology 103:137.
  3. Angata, T. et al. (2002) J. Biol. Chem. 277:24466.
  4. Simmons, D. and B. Seed (1988) J. Immunol. 141:2797.
  5. Freeman, S.D. et al. (1995) Blood 85:2002.
  6. Taylor, V.C. et al. (1999) J. Biol. Chem. 274:11505.
  7. Ulyanova, T. et al. (1999) Eur. J. Immunol. 29:3440.
Long Name
Sialic Acid Binding Ig-like Lectin 3
Entrez Gene IDs
945 (Human); 12489 (Mouse)
Alternate Names
CD33 antigen (gp67); CD33 antigen; CD33 molecule; CD33; FLJ00391; gp67; myeloid cell surface antigen CD33; p67; sialic acid binding Ig-like lectin 3; Sialic acid-binding Ig-like lectin 3; Siglec3; Siglec-3; SIGLEC3gp67

Product Datasheets

Citation for Human Siglec-3/CD33 Antibody

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. Negative regulation of Toll-like receptor-4 signaling through the binding of glycosylphosphatidylinositol-anchored glycoprotein, CD14, with the sialic acid-binding lectin, CD33.
    Authors: Ishida A, Akita K, Mori Y, Tanida S, Toda M, Inoue M, Nakada H
    J Biol Chem, 2014;289(36):25341-50.
    Species: Human
    Sample Types: Whole Cells
    Applications: Neut

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Isotype Controls

Mouse IgG1 Isotype Control

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Secondary Antibodies

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Human Siglec-3/CD33 Antibody
By Anonymous on 05/16/2017
Application: Flow Sample Tested: THP-1 human acute monocytic leukemia cell line Species: Human