Human FCRL5/FCRL3 Alexa Fluor® 647-conjugated Antibody

Catalog #: FAB20871R Datasheet / COA / SDS
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FAB20871R-100UG
R&D Systems Antibodies
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Human FCRL5/FCRL3 Alexa Fluor® 647-conjugated Antibody Summary

Species Reactivity
Human
Specificity
Detects human FCRL5/FCRL3 in direct ELISAs. In direct ELISAs, 100% cross-reactivity with recombinant human (rh) FCRL3 is observed and no cross-reactivity with rhFCRL1, 2, or 4 is observed.
Source
Monoclonal Mouse IgG2b Clone # 307307
Immunogen
Mouse myeloma cell line NS0-derived recombinant human FCRL5/FCRL3
Gln16-Arg844
Accession # AAI01067
Formulation
Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.
Label
Alexa Fluor 647 (Excitation= 650 nm, Emission= 668 nm)

Applications

Recommended Concentration
Sample
Flow Cytometry
0.25-1 µg/106 cells
Human blood‑derived CD19+ lymphocytes

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.

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Preparation and Storage

Shipping
The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: FCRL5/FCRL3

Fc Receptor-Like 5 (FCRL5), also known as FcRH5, IRTA2, and CD307, is a 120 kDa protein with sequence homology to classical Fc receptors. The type 1 transmembrane FCRL proteins contain from three to nine immunoglobulin-like domains. They are differentially expressed within the B cell lineage and can either promote or inhibit B cell proliferation and activation (1, 2). According to R&D Systems testing, FCRL5 binds to purified human IgG with high affinity. Mature human FCRL5 consists of a 836 amino acid (aa) extracellular domain (ECD) with nine Ig-like domains, a 21 aa transmembrane segment, and a 105 aa cytoplasmic domain with one immunotyrosine activation motif (ITAM) and two immunotyrosine inhibitory motifs (ITIMs) (1, 3). Mouse FCRL5 contains only five Ig-like domains in its ECD. It shares 49% aa sequence identity with human FCRL5 within common regions. Alternate splicing of human FCRL5 generates isoforms that consist of approximately the first one, six, or eight Ig-like domains (3, 4). FCRL5 expression is restricted to mature B lineage cells in lymphoid tissues and blood (3, 5‑7). Its ligation inhibits signaling through the B cell antigen receptor (8). Epstein-Barr virus transformation of B cells induces the up‑regulation of surface FCRL5 by a direct effect of its EBNA2 protein on FCRL5 gene transcription (9). The FCRL5 gene maps to the 1q21 chromosomal locus, a common site of rearrangements in B cell malignancies, and the FCRL5 protein is preferentially expressed in cell lines with 1q21 abnormalities (3). FCRL5 is up‑regulated on tumor cells in some types of B cell malignancies (6, 10‑12). In addition, soluble FCRL5 is elevated in the serum of many B cell leukemia patients (11, 13).

References
  1. Davis, R.S. (2007) Annu. Rev. Immunol. 25:525.
  2. Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
  3. Hatzivassiliou, G. et al. (2001) Immunity 14:277.
  4. SwissProt # Q96RD9.
  5. Miller, I. et al. (2002) Blood 99:2662.
  6. Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
  7. Vidal-Laliena, M. et al. (2005) Cell. Immunol. 236:6.
  8. Haga, C.L. et al. (2007) Proc. Natl. Acad. Sci. 104:9770.
  9. Mohan, J. et al. (2006) Blood 107:4433.
  10. Ise, T. et al. (2005) Clin. Cancer Res. 11:87.
  11. Ise, T. et al. (2007) Leukemia 21:169.
  12. Kazemi, T. et al. (2009) Cancer Immunol. Immunother. 58:989.
  13. Ise, T. et al. (2006) Clin. Chem. Lab. Med. 44:594.
Long Name
Fc Receptor-like 5/3
Alternate Names
FCRL5/FCRL3

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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.

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