Active Recombinant Human MS4A1 protein, His-tagged

• Cat.No.: MS4A1-48392H
• Product Overview: Recombinant Human MS4A1 Protein (Met1-Pro297) is produced by Baculovirus-Insect cells expression system. This protein carries a polyhistidine tag at the C-terminus.

Specification

• Description: B-lymphocyte antigen CD20 is also known as B-lymphocyte surface antigen B1, Leukocyte surface antigen Leu-16, Membrane-spanning 4-domains subfamily A member 1 and MS4A1, is an activated-glycosylated phosphoprotein expressed on the surface of all B-cells beginning at the pro-B phase (CD45R+, CD117+) and progressively increasing in concentration until maturity. CD20 is expressed on all stages of B cell development except the first and last; it is present from late pro-B cells through memory cells, but not on either early pro-B cells or plasma blasts and plasma cells. It is found on B-cell lymphomas, hairy cell leukemia, B-cell chronic lymphocytic leukemia, and melanoma cancer stem cells. The protein has no known natural ligand and its function 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. CD20 / MS4A1 is the target of the monoclonal antibodies (mAb) rituximab, Ibritumomab tiuxetan, and tositumomab, which are all active agents in the treatment of all B cell lymphomas and leukemias. Defects in CD20 / MS4A1 are the cause of immunodeficiency common variable type 5 (CVID5); also called antibody deficiency due to CD20 defect. CVID5 is a primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen.
• Source: Baculovirus-Insect cells
• Species: Human
• Tag: His
• Predicted N Terminal: Met 1
• Form: Delivered as bulk protein in a 0.2 μm filtered solution of 50 mM HEPES, 150 mM NaCl, DDM, CHS, pH 7.5 with Glycerol as protectant.
• Bio-activity: Immobilized Rituximab at 2 μg/mL (100 μL/well) can bind Human CD20 Full Length, His Tag, insect cell with a linear range of 1-16 ng/mL (in presence of DDM and CHS) (QC tested).
  Immobilized Human CD20 Full Length, His Tag, insect cell at 2 μg/mL (100 μL/well) on Nickel Coated Plate, can bind Rituximab with a linear range of 0.313-1.25 μg/mL (Routinely tested).
  Immobilized Ofatumumab (Human IgG1) at 10 μg/mL (100 μL/well) can bind Human CD20 Full Length, His Tag, insect cell with a linear range of 2-31 ng/mL (in presence of DDM and CHS) (Routinely tested).
• Molecular Mass: The protein has a calculated MW of 35.2 kDa. The protein migrates as 35-40 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
• Protein length: Met1-Pro297
• Endotoxin: < 1.0 EU per μg by the LAL method.
• Purity: > 80% as determined by SDS-PAGE.
• Storage: Please avoid repeated freeze-thaw cycles. No activity loss was observed after storage at: The product MUST be stored at -70 centigrade or lower upon receipt; -70 centigrade for 3 months under sterile conditions.
• Concentration: Contact us for detailes.

Gene Information

• Gene Name: MS4A1 membrane-spanning 4-domains, subfamily A, member 1 [ Homo sapiens ]
• Official Symbol: MS4A1
• Synonyms: MS4A1; CD20; B-lymphocyte antigen CD20; B1; Bp35; MS4A2; CD20 antigen; CD20 receptor; S7; CVID5; LEU-16; MGC3969
• Gene ID: 931
• mRNA Refseq: NM_021950
• Protein Refseq: NP_068769
• MIM: 112210
• UniProt ID: P11836