Recombinant Human FCRL1/FcRH1 Protein, CF

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Product Details

Summary
Reactivity HuSpecies Glossary
Applications Bioactivity
Format
Carrier-Free

Order Details

Recombinant Human FCRL1/FcRH1 Protein, CF Summary

Details of Functionality
Measured by its ability to bind human IgG with an estimated KD <60 nM.
Source
Mouse myeloma cell line, NS0-derived human FCRL1/FcRH1 protein
Ala17-Asn303, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Ala17
Protein/Peptide Type
Recombinant Proteins
Gene
FCRL1
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

Theoretical MW
32 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
38-45 kDa, reducing conditions

Packaging, Storage & Formulations

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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Buffer
Lyophilized from a 0.2 μm filtered solution in PBS and EDTA.
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Reconstitution Instructions
Reconstitute at 100 μg/mL in PBS.

Notes

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

Alternate Names for Recombinant Human FCRL1/FcRH1 Protein, CF

  • BXMH1
  • CD307a antigen
  • CD307a
  • Fc receptor homolog 1
  • Fc receptor-like 1
  • FcRH1
  • FCRH1DKFZp667O1421
  • FCRL1
  • FcR-like protein 1
  • hIFGP1
  • IFGP family protein 1
  • IFGP1
  • IFGP1Fc receptor-like protein 1
  • Immune receptor translocation-associated protein 5
  • IRTA5
  • IRTA5immunoglobulin superfamily Fc receptor, gp42

Background

Fc Receptor-Like 1 (FCRL1), also known as FcRH1, and IRTA5, is an approximately 50 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, FCRL1 binds to purified human IgG. Mature human FCRL1 consists of a 291 amino acid (aa) extracellular domain (ECD) with three Ig-like domains, a 21 aa transmembrane segment, and a 101 aa cytoplasmic domain with two immunotyrosine activation motifs (ITIMs) (3, 4). A charged glutamic acid within the transmembrane segment may mediate association with other signaling proteins. Alternative splicing may generate an isoform that lacks the transmembrane segment and an isoform that largely consists of the first two Ig-like domains (5).  Mouse FCRL1 contains only two Ig-like domains, but it shares 62% aa sequence identity with homologous regions of the human FCRL1 ECD. FCRL1 is expressed on pre-B cells and naive B cells (6, 7). It is downregulated upon B cell activation but upregulated on memory B cells (6, 8). FCRL1 is expressed on many B cell lymphoma and leukemia tumor cells with the exception of B cell acute lymphoblastic leukemia (9 - 11). Antibody crosslinking of FCRL1 triggers its tyrosine phosphorylation and augments B cell proliferation induced by the B cell receptor (6).
  1. Davis, R.S. et al. (2007) Annu. Rev. Immunol. 25:525.
  2. Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
  3. Miller, I. et al. (2002) Blood 99:2662.
  4. Davis, R.S. et al. (2001) Proc. Natl. Acad. Sci. 98:9772.
  5. Accession # Q96LA6.
  6. Leu, C.-M. et al. (2005) Blood 105:1121.
  7. Li, F.J. et al. (2008) Blood 112:179.
  8. Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
  9. Du, X. et al. (2008) Blood 111:338.
  10. Kazemi, T. et al. (2008) Int. J. Cancer 123:2113.
  11. Kazemi, T. et al. (2009) Cancer Immunol. Immunother. 58:989.

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Bioinformatics

Gene Symbol FCRL1
Uniprot