CD23/FCER2 human recombinant protein

Background:
CD23/FCER2, also known as low affinity immunoglobulin epsilon Fc receptor isoform a, is a member of subgroup II of the C-type (Ca++-dependent) lectin superfamily. It is a low affinity receptor for B cell specific antigen and IgE. Unlike many of the antibody receptors, CD23 is a C-type lectin. It is found on mature B cells, activated macrophages, eosinophils, follicular dendritic cells, and platelets. It plays an essential role in the growth and differentiation of B cells, and in the regulation of IgE production. This protein also exists in a soluble secretion form and functions as a powerful cleavage-promoting growth factor. Increased levels of soluble CD23/FCER2 lead to the recruitment of unaffected B cells in the presentation of antigen peptides to allergen-specific B cells. Recombinant human CD23/FCER2, fused to His-tag at C-terminus, was expressed in insect cell and purified by using conventional chromatography techniques.

Alternative Names:
Low affinity immunoglobulin epsilon Fc receptor, BLAST-2, C-type lectin domain family 4 member J, Fc-epsilon RII, Immunoglobulin E-binding factor, Lymphocyte IgE receptor, CD23, CD23A, CLEC4J, FCE2, IGEBF, FCER2

Domain: 48-321aa
Sequence:
DTTQSLK QLEERAARNV SQVSKNLESH HGDQMAQKSQ STQISQELEE LRAEQQRLKS QDLELSWNLN GLQADLSSFK SQELNERNEA SDLLERLREE VTKLRMELQV SSGFVCNTCP EKWINFQRKC YYFGKGTKQW VHARYACDDM EGQLVSIHSP EEQDFLTKHA SHTGSWIGLR NLDLKGEFIW VDGSHVDYSN WAPGEPTSRS QGEDCVMMRG SGRWNDAFCD RKLGAWVCDR LATCTPPASE GSAESMGPDS RPDPDGRLPT PSAPLHS

UniProt No.: P06734
NCBI Accession No.: NP_001993.2

Molecular Weight: 32 kDa (283aa)
Concentration: 0.25mg/ml (determined by absorbance at 280nm)
Formulation: Liquid in. Phosphate-Buffered Saline (pH 7.4) containing 10% glycerol
Purity: > 90% by SDS-PAGE
Bioactivity: Measured by its binding ability in a functional ELISA with Human IgE. The ED50 range ≤ 15 ug/ml.
Endotoxin: < 1 EU per 1ug of protein (determined by LAL method)
Endotoxin: His-Tag
Storage: Can be stored at +2C to +8C for 1 week. For long term storage, aliquot and store at -20C to -80C. Avoid repeated freezing and thawing cycles.