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).
Key Product Details
Species Reactivity
Human
Applications
Western Blot, Flow Cytometry, CyTOF-ready
Label
Unconjugated
Antibody Source
Polyclonal Goat IgG
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Product Specifications
Immunogen
Mouse myeloma cell line NS0-derived recombinant human FCRL5/FcRH5
Gln16-Arg844
Accession # AAK93971
Gln16-Arg844
Accession # AAK93971
Specificity
Detects human FCRL5/FcRH5 in direct ELISAs and Western blots. In direct ELISAs, approximately 10% cross-reactivity with recombinant human (rh) IRTA3, rhIRTA4, and rhIRTA5 is observed and less than 5% cross-reactivity with rhIRTA1 is observed.
Clonality
Polyclonal
Host
Goat
Isotype
IgG
Scientific Data Images for Human FCRL5/FcRH5 Antibody
Detection of FCRL5 in CD19+Human PBMC Lymphocytes by Flow Cytometry.
CD19+human peripheral blood mononuclear cell (PBMC) lymphocytes were stained with Goat Anti-Human FCRL5 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2087, filled histogram) or isotype control antibody (Catalog # AB-108-C, open histogram), followed by Phycoerythrin-conjugated Anti-Goat IgG Secondary Antibody (Catalog # F0107).Applications for Human FCRL5/FcRH5 Antibody
Application
Recommended Usage
CyTOF-ready
Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.
Flow Cytometry
0.25 µg/106 cells
Sample: CD19+ human peripheral blood mononuclear cell (PBMC) lymphocytes
Sample: CD19+ human peripheral blood mononuclear cell (PBMC) lymphocytes
Western Blot
0.1 µg/mL
Sample: Recombinant Human FCRL5/FcRH5 (Catalog # 2078-FC)
Sample: Recombinant Human FCRL5/FcRH5 (Catalog # 2078-FC)
Reviewed Applications
Read 1 review rated 4 using AF2087 in the following applications:
Flow Cytometry Panel Builder
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Advanced Features
- Spectra Viewer - Custom analysis of spectra from multiple fluorochromes
- Spillover Popups - Visualize the spectra of individual fluorochromes
- Antigen Density Selector - Match fluorochrome brightness with antigen density
Formulation, Preparation, and Storage
Purification
Antigen Affinity-purified
Reconstitution
Reconstitute at 0.2 mg/mL in sterile PBS. For liquid material, refer to CoA for concentration.
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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.
Calculators
Background: FCRL5
References
- Davis, R.S. (2007) Annu. Rev. Immunol. 25:525.
- Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
- Hatzivassiliou, G. et al. (2001) Immunity 14:277.
- SwissProt # Q96RD9.
- Miller, I. et al. (2002) Blood 99:2662.
- Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
- Vidal-Laliena, M. et al. (2005) Cell. Immunol. 236:6.
- Haga, C.L. et al. (2007) Proc. Natl. Acad. Sci. 104:9770.
- Mohan, J. et al. (2006) Blood 107:4433.
- Ise, T. et al. (2005) Clin. Cancer Res. 11:87.
- Ise, T. et al. (2007) Leukemia 21:169.
- Kazemi, T. et al. (2009) Cancer Immunol. Immunother. 58:989.
- Ise, T. et al. (2006) Clin. Chem. Lab. Med. 44:594.
Long Name
Fc Receptor-like 5
Alternate Names
BXMAS1, CD307e, FcRH5, IFGP5, IRTA2, PRO820
Gene Symbol
FCRL5
UniProt
Additional FCRL5 Products
Product Documents for Human FCRL5/FcRH5 Antibody
Certificate of Analysis
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Note: Certificate of Analysis not available for kit components.
Product Specific Notices for Human FCRL5/FcRH5 Antibody
For research use only
Related Research Areas
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Application: Immunofluorescence - fresh frozenSample Tested: human tonsilSpecies: HumanVerified Customer | Posted 11/18/2018FcRH5-Alexa647 on fresh-frozen human tonsil
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