Poly(ADP-ribose) binds to specific domains of p53 and alters its DNA binding functions.
DNA strand breaks are potential interaction sites for the nuclear enzyme poly(ADP-ribose) polymerase (PARP; E.C. 2.4.2.30) 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.
Mesh Terms:
Animals, Binding Sites, Binding, Competitive, Consensus Sequence, DNA, Single-Stranded, DNA-Binding Proteins, Humans, Mice, Poly Adenosine Diphosphate Ribose, Poly(ADP-ribose) Polymerases, Protein Binding, Proteins, Structure-Activity Relationship, Tumor Suppressor Protein p53
Animals, Binding Sites, Binding, Competitive, Consensus Sequence, DNA, Single-Stranded, DNA-Binding Proteins, Humans, Mice, Poly Adenosine Diphosphate Ribose, Poly(ADP-ribose) Polymerases, Protein Binding, Proteins, Structure-Activity Relationship, Tumor Suppressor Protein p53
J. Biol. Chem.
Date: May. 08, 1998
PubMed ID: 9565608
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