MS4A1, also known as B-lymphocyte antigen CD20, is an activated-glycosylated phosphoprotein expressed on the surface of all B-cells beginning at the pro-B phase and progressively increasing in concentration until maturity. It is to enable optimal B-cell immune response, specifically against T-independent antigens. It is suspected that it acts as a calcium channel in the cell membrane. It plays a role in the microenvironmental interactions of B cells. This structurally unique phosphoprotein plays a role in the regulation of human B cell proliferation and differentiation. It was strongly phosphorylated on resting B cells after CDw40 stimulation, suggesting that it may be functionally regulated by a protein kinase. Recombinant human MS4A1, fused to His-Tag at C-terminal, expressed in insect cell and purified by using conventional chromatography techniques. Source: Recombinant protein corresponding to aa210-297 of human MS4A1, fused to His-Tag at C-terminal, expressed in insect cell. Molecular Weight: ~11.1kD (97aa), ~18-28kD (SDS-PAGE under reducing conditions) Endotoxin: <1EU/1ug (determined by LAL method) AA Sequence: ADPGIVENEW KRTCSRPKSN IVLLSAEEKK EQTIEIKEEV VGLTETSSQP KNEEDIEIIP IQEEEEEETE TNFPEPPQDQ ESSPIENDSS PHHHHHH Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
