Title
p53 binds human telomeric G-quadruplex in vitro
Author
Matej Adámik, Iva Kejnovská, Pavla Bažantová, Marek Petr, Daniel Renčiuk, Michaela Vorlíčková, Marie Brázdová
Year
2016
Journal
Biochimie
Abstract
The tumor suppressor protein p53 is a key factor in genome stability and one of the most studied of DNA binding proteins. This is the first study on the interaction of wild-type p53 with guanine quadruplexes formed by the human telomere sequence. Using electromobility shift assay and ELISA, we show that p53 binding to telomeric G-quadruplexes increases with the number of telomeric repeats. Further, p53 strongly favors G-quadruplexes folded in potassium over those formed in sodium, thus indicating the telomeric G-quadruplex conformational selectivity of p53. The presence of the quadruplex-stabilizing ligand, N-methyl mesoporphyrin IX (NMM), increases p53 recognition of G-quadruplexes in potassium. Using deletion mutants and selective p53 core domain oxidation, both p53 DNA binding domains are shown to be crucial for telomeric G-quadruplex recognition.
Instrument
J-815
Keywords
Circular dichroism, DNA structure, Ligand binding, Biochemistry, Pharmaceutical