CST, 2266S, PU.1 Antibody

Polyclonal Antibody for studying PU.1. Validated for WB,IP,IHC,IF,F,ChIP. Highly specific and rigorously validated in-house, PU.1 Antibody (CST #2266) is ready to ship. Product Usage Information For optimal ChIP results, use 20 μl of antibody and 10 μg of chromatin (approximately 4 x 10 6 cells) per IP. This antibody has been validated using SimpleChIP ® Enzymatic Chromatin IP Kits. Western Blotting: 1:1000 Immunoprecipitation: 1:100 Immunohistochemistry (Paraffin): 1:400 Immunofluorescence (Immunocytochemistry): 1:100 Flow Cytometry (Fixed/Permeabilized): 1:50 Chromatin IP: 1:25 Storage Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at -20°C. Do not aliquot the antibody. Protocol Available protocols: Western Blotting, Immunoprecipitation, Immunohistochemistry (Paraffin), Immunofluorescence (Immunocytochemistry), Flow Cytometry (Fixed/Permeabilized), Chromatin IP Specificity / Sensitivity PU.1 Antibody detects endogenous levels of total PU.1 protein. This antibody does not cross react with other Ets family members. Species Reactivity: Human Source / Purification Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Asp26 of human PU.1 protein. Antibodies are purified by protein A and peptide affinity chromatography. Background PU.1 is a member of the Ets family of transcription factors and activates target genes through the purine-rich PU-box (1). PU.1 plays a pivotal role in the differentiation of myeloid cells and lymphocytes and is expressed in several hematopoietic cells, including B lymphocytes, macrophages, neutrophils, mast cells, early erythroid cells, and megakaryocytes (1,2). The concentration of PU.1 is critical for both the determination of hematopoietic cell lineage and the regulation of differentiation versus stem cell proliferation (3,4). In addition, PU.1 activity is influenced by phosphorylation and interactions with other hematopoietic transcription factors. Phosphorylation of PU.1 at Ser146 by CK2 promotes binding to IRF-4 and synergistic activation through the immunoglobulin κ 3' enhancer (5). Treatment of pro-B cells with IL-3 leads to phosphorylation of PU.1 at Ser140, resulting in increased PU.1 activity and activation of the anti-apoptotic gene MCL-1 (6). GATA1 binding blocks PU.1 activity during erythroid cell development (7). Overexpression of PU.1 resulting from proviral insertion during Friend virus infection can induce erythroleukemia, while reduced expression has been associated with acute myeloid leukemia (8). Alternate Names 31 kDa transforming protein; 31 kDa-transforming protein; hematopoietic transcription factor PU.1; OF; PU.1; SFPI1; SPI-1; SPI-1 proto-oncogene; SPI-A; SPI1; spleen focus forming virus (SFFV) proviral integration oncogene spi1; Transcription factor PU.1 Specification REACTIVITY: H SENSITIVITY: Endogenous MW (kDa): 42 SOURCE: Rabbit