Technical Data
C2270-05H
CD20, CT (MS4A1, B1, S7, Bp35, MS4A2, LEU-16, MGC3969, membrane-spanning 4-domains, subfamily A, member 1, B-lymphocyte cell-surface antigen B1)
Description:
CD20 is a non-glycosylated phosphoprotein expressed on the surface of all mature B-cells. Membrane-spanning 4-domains, subfamily A, member 1, also known as MS4A1, is a human gene. This gene encodes a member of the membrane-spanning 4A gene family. Members of this nascent protein family are characterized by common structural features and similar intron/exon splice boundaries and display unique expression patterns among hematopoietic cells and nonlymphoid tissues. This gene encodes a B-lymphocyte surface molecule which plays a role in the development and differentiation of B-cells into plasma cells. This family member is localized to 11q12, among a cluster of family members. Alternative splicing of this gene results in two transcript variants which encode the same protein. The protein has no known natural ligand and its function is unclear. It is suspected that it acts as a calcium channel in the cell membrane. CD20 is expressed on all stages of B cell development except the first and last; it is present from pre-pre B cells through memory cells, but not on either pro-B cells or plasma cells. It is found on B-cell lymphomas, hairy cell leukemia, and B-cell chronic lymphocytic leukemia. It is also found on skin/melanoma cancer stem cells. CD20 is the target of the monoclonal antibodies rituximab, Ibritumomab tiuxetan, and tositumomab, which are all active agents in the treatment of all B cell lymphomas and leukemias.

Applications:
Suitable for use in ELISA, Western Blot and Immunohistochemistry. Other applications not tested.

Recommneded Dilution:
Peptide ELISA: 1:8000
Western Blot: 3-5ug/ml. Band seen at ~37kD in Daudi cell lysates. Overnight incubation is recommended.
Immunohistochemistry: 2-5ug/ml. In paraffin embedded human spleen shows strong membranous staining in the follicles formed by B-cells.
Optimal dilutions to be determined by the researcher.

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 at least 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
TypeIsotypeCloneGrade
PabIgGAffinity Purified
SizeStorageShippingSourceHost
100ug-20CBlue IceHumanGoat
Concentration:
~0.5mg/ml
Immunogen:
Peptide corresponding to the sequence CQDQESSPIENDSSP from the C Terminus of human CD20 (Accession #NP_068769.2; NP_690605.1).
Purity:
Purified by immunoaffinity chromatography.
Form
Supplied as a liquid in Tris saline, pH 7.2, 0.5% BSA, 0.02% sodium azide.
Specificity:
Recognizes human CD20.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Stamenkovic I, Seed B., J Exp Med 1988 Jun 1;167(6):1975-80.