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.
Polyclonal Goat IgG
Mouse myeloma cell line NS0-derived recombinant human FCRL5/FcRH5 Gln16-Arg844 Accession # AAK93971
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.
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).
Preparation and Storage
Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
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.
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).
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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.
Fc Receptor-like 5
Entrez Gene IDs:
83416 (Human); 329693 (Mouse)
BXMAS1; BXMAS1MGC119592; CD307; CD307e antigen; CD307e; DKFZp667E2019; DKFZp667F216; Fc receptor homolog 5; Fc receptor-like 5; Fc receptor-like protein 5; FcRH5; FCRH5MGC119593; FCRL5; FcR-like protein 5; FLJ00333; FLJ00397; IFGP5; Immune receptor translocation-associated protein 2; immunoglobulin superfamily receptor translocation associated 2 (IRTA2); IRTA2; IRTA2MGC119590; PRO820
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