Intracellular Staining by Flow Cytometry
|Detection of BLIMP1/PRDM1 in U266 Human Cell Line by Flow Cytometry. U266 human myeloma cell line was stained with Mouse Anti-Human BLIMP1/PRDM1 Alexa Fluor® 700‑conjugated Monoclonal Antibody (Catalog # IC36081N, filled histogram) or isotype control antibody (Catalog # IC002N, open histogram). To facilitate intracellular staining, cells were fixed with Flow Cytometry Fixation Buffer (Catalog # FC004) and permeabilized with Flow Cytometry Permeabilization/Wash Buffer I (Catalog # FC005). View our protocol for Staining Intracellular Molecules.|
Human BLIMP1 (B Lymphocyte-Induced Maturation Protein 1), also known as PRDM1, is a 91 kDa zinc-finger transcriptional repressor that promotes B cell maturation into plasma cells. It is 789 amino acids (aa) in length, and contains an N-terminal S-E-T domain (aa 64-170) and four C-terminal C2H2-type zinc-finger motifs (aa 539‑645). The SET domain interacts with chromatin modifiers, while the zinc fingers bind to DNA. There is one 80 kDa, 691 aa alternate splice form that utilizes an internal start site. This results in a substitution of three aa for the first 101 aa of the long form, and the loss of the SET domain. At least 10 mutations exist, resulting in proteins of 61‑603 aa in length. Over aa 667-789, human BLIMP1 is 89% aa identical to mouse BLIMP1.
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