Human Siglec‑3/CD33 LlamabodyTM VHH His-tag Alexa Fluor® 647‑conjugated
Antibody

R&D Systems, part of Bio-Techne | Catalog # LFAB10733R

Recombinant Monoclonal Antibody. His-tagged VHH domain.
R&D Systems, part of Bio-Techne

Key Product Details

Species Reactivity

Human

Applications

Flow Cytometry

Label

Alexa Fluor 647 (Excitation = 650 nm, Emission = 668 nm)

Antibody Source

Recombinant Monoclonal Llama VHH domain Clone # L008.2.14N

View all Siglec-3/CD33 Antibodies »

Product Specifications

Immunogen

Chinese Hamster Ovary cell line CHO-derived human Siglec-3/CD33
Val18-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 human Siglec-3/CD33 and eGFP was stained with (A) Llama Anti-Human Siglec-3/CD33 Alexa Fluor® 647-conjugated Llamabody VHH Monoclonal Antibody (Catalog # LFAB10733R) or normal llama IgG (IC011R). Staining was performed using our Staining Membrane-associated Proteins protocol.

Applications

Application
Recommended Usage

Flow Cytometry

0.25-1 µg/106 cells
Sample: HEK293 human embryonic kidney cell line transfected with human Siglec-3/CD33 and eGFP

Formulation, Preparation, and Storage

Purification

His-tag purified from cell culture supernatant

Formulation

Supplied in a saline solution containing BSA and Sodium Azide.

Shipping

The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Protect from light. Do not freeze.
  • 12 months from date of receipt, 2 to 8 °C as supplied.

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

Additional Siglec-3/CD33 Products

Product Documents

Product Datasheets

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Note: Certificate of Analysis not available for kit components.

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Product Specific Notices


This product is provided under an agreement between Life Technologies Corporation and R&D Systems, Inc, and the manufacture, use, sale or import of this product is subject to one or more US patents and corresponding non-US equivalents, owned by Life Technologies Corporation and its affiliates. The purchase of this product conveys to the buyer the non-transferable right to use the purchased amount of the product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components (1) in manufacturing; (2) to provide a service, information, or data to an unaffiliated third party for payment; (3) for therapeutic, diagnostic or prophylactic purposes; (4) to resell, sell, or otherwise transfer this product or its components to any third party, or for any other commercial purpose. Life Technologies Corporation will not assert a claim against the buyer of the infringement of the above patents based on the manufacture, use or sale of a commercial product developed in research by the buyer in which this product or its components was employed, provided that neither this product nor any of its components was used in the manufacture of such product. For information on purchasing a license to this product for purposes other than research, contact Life Technologies Corporation, Cell Analysis Business Unit, Business Development, 29851 Willow Creek Road, Eugene, OR 97402, Tel: (541) 465-8300. Fax: (541) 335-0354.

For research use only

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