Human Siglec-3/CD33 LlaMABodyTM Bivalent VHH HuIgG2 Fusion Antibody

R&D Systems, part of Bio-Techne | Catalog # LMAB10888

Recombinant Monoclonal Antibody. Bivalent Llama VHH domain, Human IgG2 Fusion Antibody.
R&D Systems, part of Bio-Techne
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LMAB10888-100
LMAB10888-SP
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Key Product Details

Species Reactivity

Human

Applications

Flow Cytometry

Label

Unconjugated

Antibody Source

Recombinant Monoclonal Llama VHH domain Clone # L008.2.25H

View all Siglec-3/CD33 Antibodies »

Product Specifications

Immunogen

Mouse myeloma cell line NS0-derived human Siglec-3/CD33
Asp18--His259
Accession # AAA51948

Specificity

Detects human Siglec-3/CD33 in direct ELISAs.

Clonality

Monoclonal

Host

Llama

Isotype

VHH domain

Scientific Data Images

Detection of Siglec-3/CD33 in HEK293 Human Cell Line Transfected with Human Siglec-3/CD33 and eGFP by Flow Cytometry.

HEK293 human embryonic kidney cell line transfected with either (A) human Siglec-3/CD33 or (B) irrelevant protein and eGFP was stained with Llama Anti-Human Siglec-3/CD33 Llamabody VHH hIgG2 Monoclonal Antibody (Catalog # LMAB10888) followed by Allophycocyanin-conjugated Goat Anti-Human Secondary Antibody (F0135). Staining was performed using our Staining Membrane-associated Proteins protocol.

Applications

Application
Recommended Usage

Flow Cytometry

0.25 µg/106 cells
Sample: HEK293 Human Cell Line Transfected with Human Siglec-3/CD33 and eGFP

Formulation, Preparation, and Storage

Purification

Protein A or G purified from cell culture supernatant

Reconstitution

Reconstitute at 0.5 mg/mL in sterile PBS. For liquid material, refer to CoA for concentration.

Reconstitution Buffer Available:
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Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.

Shipping

Lyophilized product is shipped at ambient temperature. Liquid small pack size (-SP) is shipped with polar packs. Upon receipt, store immediately at the temperature recommended below.

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 CD33related 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 alpha2,3-linkage over alpha2,6-linkage (5). Studies indicated that Siglec-3 recruits SHP-1 and SHP-2 to its ITIMs (6, 7). When co-cross-linking with Fc gammaR1, Siglec3- 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

Alternate Names

CD33, gp67, Siglec3

Entrez Gene IDs

945 (Human); 12489 (Mouse); 102117580 (Cynomolgus Monkey)

Gene Symbol

CD33

UniProt

AAA51948

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Product Specific Notices

For research use only

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