Human FCRL5/FCRL3 Alexa Fluor® 750-conjugated Antibody

Catalog # Availability Size / Price Qty
FAB20871S-100UG
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Human FCRL5/FCRL3 Alexa Fluor® 750-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 750

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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