Recombinant Mouse Fc gamma RIIB/CD32b Protein, CF

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Recombinant Mouse Fc gamma RIIB/CD32b Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to bind mouse IgG with an estimated KD < 150 nM.
Mouse myeloma cell line, NS0-derived mouse Fc gamma RIIB/CD32b protein
Thr30-Arg207, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Structure / Form
Predicted Molecular Mass
22 kDa
30-40 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it 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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: Fc gamma RIIB/CD32b

Receptors for the Fc region of IgG (Fc gamma Rs) are members of the Ig superfamily that function in the activation or inhibition of immune responses such as degranulation, phagocytosis, ADCC (antibody-dependent cellular toxicity), cytokine release, and B cell proliferation (1 - 3). The Fc gamma Rs have been divided into three classes based on close relationships in their extracellular domains; these groups are designated Fc gamma  RI (also known as CD64), Fc gamma  RII (CD32), and Fc gamma  RIII (CD16). Each group may be encoded by multiple genes and exist in different isoforms depending on species and cell type. The CD64 proteins are high affinity receptors
(~10-8 - 10-9 M) capable of binding monomeric IgG, whereas the CD16 and CD32 proteins bind IgG with lower affinities (~10-6 - 10-7 M) only recognizing IgG aggregates surrounding multivalent antigens (1, 4). Fc gamma Rs that deliver an activating signal either have an intrinsic immunoreceptor tyrosine-based activation motif (ITAM) within their cytoplasmic domains or associate with one of the ITAM-bearing adapter subunits, Fc R gamma or zeta (3, 5). The only inhibitory member in human and mouse, Fc gamma  RIIB, has an intrinsic cytoplasmic immunoreceptor tyrosine-based inhibitory motif (ITIM). The coordinated functioning of activating and inhibitory receptors is necessary for successful initiation, amplification, and termination of immune responses (5).

Three distinct genes encode the human CD32 group. These proteins share 94 - 99% amino acid identity in their extracellular domains but have divergent cytoplasmic domains and signaling capacities (1, 3). In contrast, a single gene encodes mouse CD32 (4). The protein product delivers an inhibitory signal upon ligand binding and is functionally equivalent to human Fc gamma RIIB (5). Mouse CD32 is the only Fc gamma R expressed on B cells and is also expressed on macrophages, neutrophils and mast cells. Mouse CD16 is closely related to mouse CD32 throughout its extracellular domain (95% amino acid identity), but has a divergent cytoplasmic domain and functions as an activating receptor. Together these proteins constitute an activating/inhibiting receptor pair to regulate immune responses (5).

  1. Van de Winkel, J. and P. Capes (1993) Immunol. Today 14:215.
  2. Raghaven, M. and P. Bjorkman (1996) Annu. Rev. Cell Dev. Biol. 12:181.
  3. Ravetch, J. and S. Bolland (2001) Annu. Rev. Immunol. 19:275.
  4. Takai, T. (2002) Nature Rev. Immunol. 2:580.
  5. Ravetch, J. and L. Lanier (2000) Science 290:84.
Long Name
Fc gamma Receptor II
Entrez Gene IDs
2213 (Human); 14130 (Mouse); 289211 (Rat); 102139530 (Cynomolgus Monkey)
Alternate Names
CD32 antigen; CD32b; CD32Fc fragment of IgG, low affinity II, receptor for (CD32); CDw32; Fc fragment of IgG, low affinity IIb, receptor (CD32); Fc fragment of IgG, low affinity IIb, receptor for (CD32); Fc gamma RIIB; FCG2; Fc-gamma RII-b; fc-gamma-RIIb; FCGR2; FCGR2B; FcgRIIB; FCRIIB; fcRII-b; IGFR2; IgG Fc receptor II-b; low affinity immunoglobulin gamma Fc region receptor II-b

Citations for Recombinant Mouse Fc gamma RIIB/CD32b Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

4 Citations: Showing 1 - 4
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  1. The secreted protein Cowpox Virus 14 contributes to viral virulence and immune evasion by engaging Fc-gamma-receptors
    Authors: RF Iyer, DM Edwards, P Kolb, HP Raué, CA Nelson, ML Epperson, MK Slifka, JC Nolz, H Hengel, DH Fremont, K Früh
    PloS Pathogens, 2022;18(9):e1010783.
    Species: Mouse
    Sample Types: Recombinant Protein
    Applications: Bioassay
  2. Integrin &alphav&beta8 on T�cells suppresses anti-tumor immunity in multiple models and is a promising target for tumor immunotherapy
    Authors: E Dodagatta-, HY Ma, B Liang, J Li, DS Meyer, SY Chen, KH Sun, X Ren, B Zivak, MD Rosenblum, MB Headley, L Pinzas, NI Reed, JS Del Cid, BC Hann, S Yang, A Giddabasap, K Noorbehesh, B Yang, J Dal Porto, T Tsukui, K Niessen, A Atakilit, RJ Akhurst, D Sheppard
    Cell Reports, 2021;36(1):109309.
    Species: Mouse
    Sample Types: Recombinant Protein
    Applications: Bioassay
  3. Myostatin and activin blockade by engineered follistatin results in hypertrophy and improves dystrophic pathology in mdx mouse more than myostatin blockade alone
    Authors: A Iskenderia, N Liu, Q Deng, Y Huang, C Shen, K Palmieri, R Crooker, D Lundberg, N Kastrapeli, B Pescatore, A Romashko, J Dumas, R Comeau, A Norton, J Pan, H Rong, K Derakhchan, DE Ehmann
    Skelet Muscle, 2018;8(1):34.
    Species: Mouse
    Sample Types: In Vivo
    Applications: In Vivo
  4. Osteoclast inhibitory peptide-1 binding to the Fc gammaRIIB inhibits osteoclast differentiation.
    Authors: Shanmugarajan S, Beeson CC, Reddy SV
    Endocrinology, 2010;151(9):4389-99.
    Species: Mouse
    Sample Types: Peptide
    Applications: Surface Plasmon Resonance


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