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Recombinant human Fc gamma RIIB /CD32b Protein, His tag, 1mg  

Recombinant human Fc gamma RIIB /CD32b Protein, His tag, 1mg

Recombinant Human Fc gamma RIIB /CD32b Protein (rhCD32b), produced in human HEK293 cells, His-Tag

Synonym
recombinant, human, protein, FCGR2B, CD32b, CD32, FCG2

More details

CDB-H5228-1K

Availability: within 7 days

1 800,00 €

Background
Receptors for the Fc region of IgG (Fc γ R) are members of the Ig superfamily that function in the activation or inhibition of immune responses. Three classes of human Fc γ Rs: RI (CD64), RII (CD32), and RIII (CD16), which generate multiple isoforms, are recognized. There are three genes for human Fcγ RII /CD32 (A, B, and C) and one for mouse Fcγ RII B (CD32B). CD32 is a low affinity receptor for IgG. Low affinity immunoglobulin gamma Fc region receptor II-b (FCGR2B) is also known as CD32b, FCG2, IGFR2. CD32B is expressed on B cells and myeloid dendritic cells. Ligation of CD32B on B cells downregulates antibody production and may, in some circumstances, promote apoptosis. Co-ligation of CD32B on dendritic cells inhibits maturation and blocks cell activation. CD32B may also be a target for monoclonal antibody therapy for malignancies.

Source
Recombinant Human Fc gamma RIIB /CD32b Protein (rhCD32b) Ala 46 - Pro 217 (Accession # NP_001002273.1) was produced in human HEK293 cells.

Molecular Characterization
rhCD32b, fused with 6×His tag at the C-terminus, has a calculated MW of 20.2 kDa. The predicted N-terminus is Ala 46. DTT-reduced Protein migrates as 23-33 kDa due to different glycosylation.

Endotoxin
Less than 1.0 EU per μg of the rhCD32b by the LAL method.

Purity
>95% as determined by SDS-PAGE.

Formulation
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally Mannitol or Trehalose are added as protectants before lyophilization.

Reconstitution
See Certificate of Analysis for details of reconstitution instruction and specific concentration.

Storage
Avoid repeated freeze-thaw cycles. No activity loss was observed after storage at:
In lyophilized state for 1 year (4C-8C); After reconstitution under sterile conditions for 1 month (4C-8C) or 3 months (-20C to -70C).

Bioactivity 
Immobilized Folic acid-BSA conjugate at 5 μg/mL (100 μL/well) can bind Human FOLR1, Fc Tag (Cat. No. FO1-H5253) with a linear range of 10-78 ng/mL (QC tested).

References

(1) Hamada F., et al., 1993, Proc. Natl. Acad. Sci. U.S.A. 90:6305-6309.
(2) Sarmay G., et al., 1997, Immunol. Lett. 57:159-164.
(3) Laine D., et al., 2005, J. Gen. Virol. 86:1771-1784.