Abstract
The promoter of hnRNP K oncogene was found to contain a G/C-rich sequence on the same DNA strand, which can form interconvertible G-quadruplex, i-motif, and hairpin structures. Protein CNBP could bind and stabilize the G-quadruplex, inducing transformation of the hairpin into the G-quadruplex, resulting in down-regulation of hnRNP K transcription. In contrast, Corticosterone could bind and stabilize the hairpin, inducing transformation of the G-quadruplex into the hairpin, resulting in up-regulation of hnRNP K gene transcription.
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