Abstract
Oligonucleotide RA36 contains two G-quadruplex modules with thrombin binding aptamer sequence GGTTGGTGTGGTTGG. Each of the modules potentially can bind thrombin while differing in functional activity. Despite that, previously published studies report a single dissociation constant for the thrombin:RA36 complex, which value varies widely. Here we address this discrepancy using electrophoretic mobility shift assay. Our results reveal that the interaction between RA36 and thrombin is a two-stage process. The two modules have different affinities for thrombin, which explains the discrepancy in the published data.
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