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Your Position: 홈 > Protein > CD20 > CD0-H82E3

Biotinylated Human CD20 / MS4A1 Full Length Protein, His,Avitag™ (Nanodisc)

INTRODUCTION
QC & Assay Protocol
Citation & Background
  • Synonym
    MS4A1,CD20,MS4A-1
  • Source
    Biotinylated Human CD20 Full Length, His,Avitag(CD0-H82E3) is expressed from human 293 cells (HEK293). It contains AA Met 1 - Pro 297 (Accession # P11836-1).
    Predicted N-terminus: Met 1
    Request for sequence
  • Molecular Characterization
    CD20 Structure

    The CD20 carries a polyhistidine tag at the C-terminus followed by an Avi tag with calculated MW of 36.9 kDa and migrates as 43 kDa when calibrated against Star Ribbon Pre-stained Protein Marker under reducing (R) condition (SDS-PAGE) due to glycosylation. The membrane scaffold protein (MSP1D1) has calculated MW of 24.7 kDa, and it migrates as 25 kDa under reducing (R) condition (SDS-PAGE).

    Nanodiscs are a new class of model membranes that are being used to solubilize and study a range of integral membrane proteins and membrane-associated proteins. The Nanodisc bilayer is bounded by a membrane scaffold protein (MSP1D1) coat that confers enhanced stability and a narrow particle size distribution.

    The nanodisc assembles from a mixture of full length membrane protein in detergent, phospholipid micelles and membrane scaffold protein(MSP1D1) upon removal of the detergent.

  • Labeling
    Biotinylation of this product is performed using Avitag™ technology. Briefly, the single lysine residue in the Avitag is enzymatically labeled with biotin.
  • Protein Ratio
    Passed as determined by the HABA assay / binding ELISA.
  • Endotoxin
    Less than 1.0 EU per μg by the LAL method.
  • Purity

    >90% as determined by SDS-PAGE.

  • Formulation

    Supplied as 0.2 μm filtered solution in 20 mM HEPES, 150 mM NaCl, pH7.5 with trehalose as protectant.

    Contact us for customized product form or formulation.

  • Shipping

    This product is supplied and shipped with dry ice, please inquire the shipping cost.

  • Storage

    Please avoid repeated freeze-thaw cycles.

    This product is stable after storage at:

    1. The product MUST be stored at -70°C or lower upon receipt;
    2. -70°C for 3 months under sterile conditions.
*The isotype control of empty/mock nanodisc (Cat. No. APO-H81Q5) is sold separately and not included in protein, you can follow this link for product information.
SDS-PAGE
CD20 SDS-PAGE

Biotinylated Human CD20 Full Length, His,Avitag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 90% (With Star Ribbon Pre-stained Protein Marker).

Bioactivity-ELISA
CD20 ELISA

Immobilized Rituximab biosimilar at 5 μg/mL (100 μL/well) can bind Biotinylated Human CD20 Full Length, His,Avitag (Cat. No. CD0-H82E3) with a linear range of 2-62.5 ng/mL (QC tested).

Protocol
Bioactivity-BLI
CD20 BLI

Loaded Rituximab on Protein A Biosensor, can bind with Biotinylated Human CD20 Full Length, His,Avitag (Cat. No. CD0-H82E3) an affinity constant of 31.3 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).

Protocol
Bioactivity-FACS
CD20 FACS

2e5 of anti-CD20 CAR-293 cells were stained with 100 μL of 3 μg/mL of Biotinylated Human CD20 Full Length, His,Avitag (Cat. No. CD0-H82E3) and negative control protein respectively, washed and then followed by PE-SA and analyzed with FACS (QC tested).

Protocol
  • Background
    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.
  • Clinical and Translational Updates

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