p53, phosphorylated (Ser20) (Tumor Suppressor Protein, Oncogene Protein) Blocking Peptide

Control Peptide for P1001-27G. Synthetic phosphopeptide corresponding to residues surrounding Ser20 of human p53.\n\nThe p53 tumor suppressor protein plays a major role in cellular response to DNA damage and other genomic aberrations. Activation of p53 can lead to either cell cycle arrest and DNA repair or apoptosis (1). p53 is phosphorylated at multiple sites in vivo and by several different protein kinases in vitro (2,3). DNA damage induces phosphorylation of p53 at Ser15 and Ser20 and leads to reduced interaction of p53 with its negative regulator, oncoprotein MDM2 (4). MDM2 inhibits the accumulation of p53 by targeting it for ubiquitination and proteasomal degradation (6,7). p53 can apparently be phosphorylated by ATM, ATR and DNA-PK at Ser15 and Ser37; the phosphorylations impair the ability of MDM2 to bind p53, promoting both the accumulation and functional activation of p53 in response to DNA damage (4,5). Chk2 and Chk1 can phosphorylate p53 at Ser20, enhancing its tetramerization, stability and activity (8,9). p53 is phosphorylated at Ser392 in vivo (11,12) and by CAK in vitro (12). Phosphorylation of p53 at Ser392 is altered in human tumors (14) and has been reported to influence the growth suppressor function, DNA binding and transcriptional activation of p53 (10,11,13). p53 is phosphorylated at Ser6 and Ser9 by ck1delta and ck1epsilon both in vitro and in vivo (10,15). Phosphorylation of p53 at Ser46 is important in regulating the ability of p53 to induce apoptosis (16).\n\nApplications: \nSuitable for use in ELISA, Antibody Blocking. Not suitable for use inWestern Blot due to low molecular weight. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 10ul Control Peptide per 10ul P1001-27G.\nImmunohistochemistry: 5ul Control Peptide per 1ul P1001-27G.\nOptimal dilutions to be determined by the researcher.

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