title: Mutant p53 proteins bind DNA in a DNA structure-selective mode.
abstract: Despite the loss of sequence-specific DNA binding, mutant p53 (mutp53) proteins can induce or repress transcription of mutp53-specific target genes. To date, the molecular basis for transcriptional modulation by mutp53 is not understood, but increasing evidence points to the possibility that specific interactions of mutp53 with DNA play an important role. So far, the lack of a common denominator for mutp53 DNA binding, i.e. the existence of common sequence elements, has hampered further characterization of mutp53 DNA binding. Emanating from our previous discovery that DNA structure is an important determinant of wild-type p53 (wtp53) DNA binding, we analyzed the binding of various mutp53 proteins to oligonucleotides mimicking non-B DNA structures. Using various DNA-binding assays we show that mutp53 proteins bind selectively and with high affinity to non-B DNA. In contrast to sequence-specific and DNA structure-dependent binding of wtp53, mutp53 DNA binding to non-B DNA is solely dependent on the stereo-specific configuration of the DNA, and not on DNA sequence. We propose that DNA structure-selective binding of mutp53 proteins is the basis for the well-documented interaction of mutp53 with MAR elements and for transcriptional activities mediates by mutp53.
authors.affiliation: Department of Tumor Virology, Heinrich-Pette-Institute Martinistrasse 52, 20251 Hamburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Göhler
authors.forename: Stefan
authors.initials: S
authors.lastname: Jäger
authors.forename: Gabriele
authors.initials: G
authors.lastname: Warnecke
authors.forename: Hideyo
authors.initials: H
authors.lastname: Yasuda
authors.forename: Ella
authors.initials: E
authors.lastname: Kim
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Deppert
mesh_terms: D004247:DNA / Q000737:chemistry* / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D009154:Mutation; D009690:Nucleic Acid Conformation; D040081:Protein Array Analysis; D011485:Protein Binding; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism*
chemical_list: D016159:Tumor Suppressor Protein p53; D004247:DNA
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