CST, 13121S, Phospho-SQSTM1/p62 (Thr269/Ser272) Antibody

Polyclonal Antibody for studying SQSTM1 (Thr269/Ser272) phosphate. Validated for Western Blotting,Immunoprecipitation. Highly specific and rigorously validated in-house, Phospho-SQSTM1/p62 (Thr269/Ser272) Antibody (CST #13121) is ready to ship. Product Usage Information Western Blotting: 1:1000 Immunoprecipitation: 1:100 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 Specificity / Sensitivity Phospho-SQSTM1/p62 (Thr269/Ser272) Antibody recognizes endogenous levels of SQSTM1 protein only when phosphorylated at Thr269 and Ser272. This antibody may react with either dually or singly phosphorylated SQSTM1/p62. A background band is detected at 75 kDa in some cell lines. Species Reactivity: Human, Mouse, Rat Source / Purification Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Thr269/Ser272 of human SQSTM1/p62 protein. Antibodies are purified by protein A and peptide affinity chromatography. Background Sequestosome 1 (SQSTM1, p62) is a ubiquitin binding protein involved in cell signaling, oxidative stress, and autophagy (1-4). It was first identified as a protein that binds to the SH2 domain of p56Lck (5) and independently found to interact with PKCζ (6,7). SQSTM1 was subsequently found to interact with ubiquitin, providing a scaffold for several signaling proteins and triggering degradation of proteins through the proteasome or lysosome (8). Interaction between SQSTM1 and TRAF6 leads to the K63-linked polyubiquitination of TRAF6 and subsequent activation of the NF-κB pathway (9). Protein aggregates formed by SQSTM1 can be degraded by the autophagosome (4,10,11). SQSTM1 binds autophagosomal membrane protein LC3/Atg8, bringing SQSTM1-containing protein aggregates to the autophagosome (12). Lysosomal degradation of autophagosomes leads to a decrease in SQSTM1 levels during autophagy; conversely, autophagy inhibitors stabilize SQSTM1 levels. Studies have demonstrated a link between SQSTM1 and oxidative stress. SQSTM1 interacts with KEAP1, which is a cytoplasmic inhibitor of NRF2, a key transcription factor involved in cellular responses to oxidative stress (3). Thus, accumulation of SQSTM1 can lead to an increase in NRF2 activity. Phosphorylation of SQSTM1 at Thr269 and Ser272 during mitosis by CDK1 can regulate cell cycle progression (13). Alternate Names A170; autophagy receptor p62; DMRV; EBI3-associated protein of 60 kDa; EBI3-associated protein p60; EBIAP; FTDALS3; NADGP; ORCA; OSIL; oxidative stress induced like; p60; p62; p62B; PDB3; phosphotyrosine independent ligand for the Lck SH2 domain p62; Phosphotyrosine-independent ligand for the Lck SH2 domain of 62 kDa; sequestosome 1; Sequestosome-1; SQSTM; SQSTM1; Ubiquitin-binding protein p62; ZIP3 Specification REACTIVITY: H M R SENSITIVITY: Endogenous MW (kDa): 62 SOURCE: Rabbit