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J Biol Chem. 1998 May 8;273(19):11839-43.

Poly(ADP-ribose) binds to specific domains of p53 and alters its DNA binding functions.

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  • 1Institute of Pharmacology and Toxicology, University of Zürich-Tierspital, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland.


DNA strand breaks are potential interaction sites for the nuclear enzyme poly(ADP-ribose) polymerase (PARP; E.C. and the tumor suppressor protein p53. Both proteins bind and respond to DNA breaks and both play a role in DNA damage signaling. A temporary colocalization and complex formation between these proteins has been demonstrated in mammalian cells. Here we show that free and poly(ADP-ribose) polymerase-bound ADP-ribose polymers target three domains in p53 protein for strong noncovalent interactions. The polymer binding sites could be mapped to two amino acid sequences in the sequence-specific core DNA binding domain of p53 (amino acid positions 153-178 and 231-253) and another one in the oligomerization domain (amino acids 326-348). In mobility shift experiments, poly(ADP-ribose) effectively prevented and reversed p53 binding to the palindromic p53 consensus sequence. Additionally, poly(ADP-ribose) also interfered with the DNA single strand end binding of p53. The results suggest that ADP-ribose polymers could play a role in regulating the DNA binding properties of p53.

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