FCRLB/FCRY Antibody

Western blot shows lysates of JAR human choriocarcinoma cell line. PVDF Membrane was probed with 1 µg/mL of Human FCRLB/FCRY Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4705) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for FCRLB/FCRY at approximately 57-60 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

• Reactivity: Hu
• Applications: WB
• Clonality: Polyclonal
• Host: Sheep
• Conjugate: Unconjugated
• Concentration: LYOPH

FCRLB/FCRY Antibody Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human FCRLB/FCRY
  Ala18-Ser426
  Accession # Q6BAA4
• Specificity: Detects human FCRLB/FCRY in direct ELISAs and Western blots. In direct ELISAs, approximately 30% cross-reactivity with recombinant mouse (rm) FCRLB/FCRY is observed, and less than 1% cross-reactivity with recombinant human FCRN and rmFCRN is observed.
• Source: N/A
• Isotype: IgG
• Clonality: Polyclonal
• Host: Sheep
• Gene: FCRLB
• Purity Statement: Antigen Affinity-purified

Applications/Dilutions

• Dilutions:
  • Western Blot 1 ug/mL

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  12 months from date of receipt, -20 to -70 degreesC as supplied. 1 month, 2 to 8 degreesC under sterile conditions after reconstitution. 6 months, -20 to -70 degreesC under sterile conditions after reconstitution.
• Buffer: 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.
• Preservative: No Preservative
• Concentration: LYOPH
• Reconstitution Instructions: Sterile PBS to a final concentration of 0.2 mg/mL.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for FCRLB/FCRY Antibody

• Fc receptor homolog expressed in B cells protein 2
• Fc receptor like 2
• Fc receptor-like and mucin-like 2
• Fc receptor-like and mucin-like protein 2
• Fc receptor-like B
• Fc receptor-like protein 2
• Fc receptor-related protein Y
• FcRL2
• FCRL2FCRLM2
• FCRLB
• FCRLM2
• FCRLY
• FCRY
• FLJ31052
• FREB2
• FREB-2
• FREB-2FcRY
• RP11-474I16.6

Background

FCRLB, also known as FCRL2, FCRY, and FREB2, is a 57-60 kDa protein with sequence homology to classical Fc receptors. There are at least six type 1 transmembrane FCRL proteins and two that lack transmembrane segments. Each family member contains between three and nine immunoglobulin-like domains. FCRL proteins 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, FCRLB binds to purified human IgG with high affinity. Human FCRLB shares 82% and 85% amino acid sequence identity with mouse and rat FCRLB, respectively. It contains a putative signal peptide, three immunoglobulin-like domains, and a mucin-like stalk that is rich in Pro, Ser, and Thr residues (1 - 3). The stalk region also contains di-Leu motifs and an unpaired cysteine (1 - 3). Alternative splicing generates isoforms with deletions in the putative signal peptide and substitutions and/or truncations in the third Ig-like domain (3). When expressed in transfectants, FCRLB is not secreted but shows a diffuse intracellular localization (3, 4). FCRLB is expressed at a low level in placenta and in B lineage cells of the germinal center (3, 4). It is upregulated in B cells by BAFF and LPS (5). Among non-hematopoietic cells, FCRLB is expressed in fibroblasts, melanocytes, and melanoma (3, 5). It is preferentially expressed in nonproliferating cells and at the onset of apoptosis (4, 5).

1. Davis, R.S. (2007) Annu. Rev. Immunol. 25:525.
2. Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
3. Chikaev, N.A. et al. (2005) Genomics 85:264.
4. Wilson, T.J. and M. Colonna (2005) Genes Immun. 6:341.
5. Masuda, K. et al. (2005) Gene 363:32.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Bioinformatics

• Gene Symbol: FCRLB
• Uniprot:
  • Q6BAA4(Human)