Detects human Siglec‑7/CD328 in direct ELISAs and Western blots. In direct ELISAs, approximately 15% cross‑reactivity with recombinant human (rh) Siglec-9 is observed and approximately 5% cross-reactivity with recombinant mouse Siglec-E, rhSiglec-6, and rhSiglec-8 is observed.
Polyclonal Goat IgG
Mouse myeloma cell line NS0-derived recombinant human Siglec-7/CD328 Gln19-Gly357 Accession # Q9Y286
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.
<0.10 EU per 1 μg of the antibody by the LAL method.
Recombinant Human Siglec‑7/CD328 Fc Chimera (Catalog # 1138-SL)
2.5 µg/106 cells
Human whole blood monocytes
Immersion fixed paraffin-embedded sections of human lung
Measured by its ability to neutralize Siglec‑7-mediated adhesion of human red blood cells. Kelm, S. et al. (1994) Current Biology 4:965. The Neutralization Dose (ND50) is typically 0.3-0.9 µg/mL in the presence of 1.5 µg/mL Recombinant Human Siglec‑7 Fc Chimera.
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.
Cell Adhesion Mediated by Siglec‑7 and Neutralization by Human Siglec‑7 Antibody. Recombinant Human Siglec‑7 Fc Chimera (Catalog # 1138-SL), immobilized onto a microplate, supports the adhesion of human red blood cells in a dose-dependent manner (orange line). Adhesion elicited by Recombinant Human Siglec‑7 Fc Chimera (1.5 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human Siglec‑7 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF1138). The ND50 is typically 0.3-0.9 µg/mL.
Preparation and Storage
Reconstitute at 0.2 mg/mL in sterile PBS.
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.
Siglecs (1) (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 (1‑4). 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 (2, 3). This fact, together with the presence of two conserved immunoreceptor tyrosine-based inhibition motifs (ITIMs) in their cytoplasmic tails, suggests that CD33-related Siglecs are involved in the regulation of cellular activation within the immune system.
Human Siglec-7 encodes a 467 amino acid (aa) polypeptide with a hydrophobic signal peptide, an N-terminal Ig-like V-type domain, two Ig-like C2-type domains, a transmembrane region and a cytoplasmic tail (5). Siglec-7 exists as a monomer on the cell surface and is expressed on natural killer cells, CD8+ T cells and monocytes (3, 5). It binds equally well to both alpha 2,3- and alpha 2,6-linked sialic acid (5). The gene encoding Siglec-7 was mapped to chromosome 19q13.3.
Crocker, P.R. et al. (1998) Glycobiology 8:v.
Crocker, P.R. and A. Varki (2001) Trends Immunol. 22:337.
Crocker, P.R. and A. Varki (2001) Immunology 103:137.
Angata, T. et al. (2002) J. Biol. Chem. 277:24466.
Nicoll, G. et al. (1999) J. Biol. Chem. 274:34089.
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.
The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.