Noncanonical DNA motifs as transactivation targets by wild type and mutant p53.

PLoS Genetics
J J JordanM A Resnick

Abstract

Sequence-specific binding by the human p53 master regulator is critical to its tumor suppressor activity in response to environmental stresses. p53 binds as a tetramer to two decameric half-sites separated by 0-13 nucleotides (nt), originally defined by the consensus RRRCWWGYYY (n = 0-13) RRRCWWGYYY. To better understand the role of sequence, organization, and level of p53 on transactivation at target response elements (REs) by wild type (WT) and mutant p53, we deconstructed the functional p53 canonical consensus sequence using budding yeast and human cell systems. Contrary to early reports on binding in vitro, small increases in distance between decamer half-sites greatly reduces p53 transactivation, as demonstrated for the natural TIGER RE. This was confirmed with human cell extracts using a newly developed, semi-in vitro microsphere binding assay. These results contrast with the synergistic increase in transactivation from a pair of weak, full-site REs in the MDM2 promoter that are separated by an evolutionary conserved 17 bp spacer. Surprisingly, there can be substantial transactivation at noncanonical (1/2)-(a single decamer) and (3/4)-sites, some of which were originally classified as biologically relevant canonical conse...Continue Reading

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Datasets Mentioned

BETA
GM12824
GM12825

Methods Mentioned

BETA
immunoprecipitation
ChIP
fluorescence-activated cell sorting
ubiquitination
transfection
PCR
electrophoretic mobility shift binding
ChIPSeq
Assay
protein assay

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