Pliable DNA conformation of response elements bound to transcription factor p63.

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TitlePliable DNA conformation of response elements bound to transcription factor p63.
Publication TypeJournal Article
Year of Publication2012
AuthorsChen, C, Gorlatova, N, Herzberg, O
JournalJ Biol Chem
Date Published2012 Mar 2
KeywordsCrystallography, X-Ray, DNA, Superhelical, Humans, Nucleic Acid Conformation, Protein Multimerization, Protein Structure, Quaternary, Response Elements, Transcription Factors, Tumor Suppressor Proteins

We show that changes in the nucleotide sequence alter the DNA conformation in the crystal structures of p63 DNA-binding domain (p63DBD) bound to its response element. The conformation of a 22-bp canonical response element containing an AT spacer between the two half-sites is unaltered compared with that containing a TA spacer, exhibiting superhelical trajectory. In contrast, a GC spacers abolishes the DNA superhelical trajectory and exhibits less bent DNA, suggesting that increased GC content accompanies increased double helix rigidity. A 19-bp DNA, representing an AT-rich response element with overlapping half-sites, maintains superhelical trajectory and reveals two interacting p63DBD dimers crossing one another at 120°. p63DBD binding assays to response elements of increasing length complement the structural studies. We propose that DNA deformation may affect promoter activity, that the ability of p63DBD to bind to superhelical DNA suggests that it is capable of binding to nucleosomes, and that overlapping response elements may provide a mechanism to distinguish between p63 and p53 promoters.

Alternate JournalJ. Biol. Chem.
PubMed ID22247550
PubMed Central IDPMC3293545
Grant ListR01-GM087922 / GM / NIGMS NIH HHS / United States