Phospho-p53 (Ser15) (16G8) Mouse mAbProduct information
Product Pathways - DNA Damage
Phospho-p53 (Ser15) (16G8) Mouse mAb #9286
|9286L||300 µl (60 western blots)||---||In Stock||---|
|9286S||100 µl (20 western blots)||---||In Stock||---|
|9286T||20 µl (2 western blots)||---||In Stock||---|
|9286||carrier free and custom formulation / quantity||email request|
Species cross-reactivity is determined by western blot.
Applications Key: W=Western Blotting, IF-IC=Immunofluorescence (Immunocytochemistry), F=Flow Cytometry
Specificity / Sensitivity
Phospho-p53 (Ser15) (16G8) Mouse mAb detects endogenous levels of p53 only when phosphorylated at serine 15. The antibody does not cross-react with p53 phosphorylated at other sites.
Source / Purification
Monoclonal antibody is produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser15 of human p53.
Western blot analysis of extracts from HT29 cells, untreated or UV-treated (100 mJ/cm2, 1 hr), using Phospho-p53 (Ser15) (16G8) Mouse mAb (upper) or p53 (DO-7) Mouse mAb #48818 (lower).
Confocal immunofluorescent analysis of HT-29 cells, untreated (left) or UV-treated (right), using Phospho-p53 (Ser15) (16G8) Mouse mAb (green). Actin filaments have been labeled with Alexa Fluor® 555 phalloidin (red).
Flow cytometric analysis of HT-29 cells, untreated (blue) or UV-treated (green), using Phospho-p53 (Ser15) (16G8) Mouse mAb compared to a nonspecific negative control antibody (red).
The 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 a reduced interaction between p53 and its negative regulator, the oncoprotein MDM2 (4). MDM2 inhibits p53 accumulation by targeting it for ubiquitination and proteasomal degradation (5,6). p53 can be phosphorylated by ATM, ATR, and DNA-PK at Ser15 and Ser37. Phosphorylation impairs the ability of MDM2 to bind p53, promoting both the accumulation and activation of p53 in response to DNA damage (4,7). Chk2 and Chk1 can phosphorylate p53 at Ser20, enhancing its tetramerization, stability, and activity (8,9). p53 is phosphorylated at Ser392 in vivo (10,11) and by CAK in vitro (11). Phosphorylation of p53 at Ser392 is increased in human tumors (12) and has been reported to influence the growth suppressor function, DNA binding, and transcriptional activation of p53 (10,13,14). p53 is phosphorylated at Ser6 and Ser9 by CK1δ and CK1ε both in vitro and in vivo (13,15). Phosphorylation of p53 at Ser46 regulates the ability of p53 to induce apoptosis (16). Acetylation of p53 is mediated by p300 and CBP acetyltransferases. Inhibition of deacetylation suppressing MDM2 from recruiting HDAC1 complex by p19 (ARF) stabilizes p53. Acetylation appears to play a positive role in the accumulation of p53 protein in stress response (17). Following DNA damage, human p53 becomes acetylated at Lys382 (Lys379 in mouse) in vivo to enhance p53-DNA binding (18). Deacetylation of p53 occurs through interaction with the SIRT1 protein, a deacetylase that may be involved in cellular aging and the DNA damage response (19).
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- Solomon, J.M. et al. (2006) Mol Cell Biol 26, 28-38.
- Hammond, E. M. et al. (2002) Mol. Cell. Biol. 22, 1834-1843. Applications: Western Blotting.
- Scott, S. P. et al. (2002) Proc. Natl. Acad. Sci. USA 99, 925-930. Applications: Western Blotting.
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This product is intended for research purposes only. The product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.
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