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Ligand-Induced Dimerization of a Truncated Parallel MYC G-Quadruplex.
Chembiochem : a European Journal of Chemical Biology 2018 March 3
Binding of an indoloquinoline derivative with an aminoalkyl side chain to a truncated sequence from the MYC promoter region was studied through isothermal titration calorimetry (ITC). The targeted MYC3 sequence lacks 3'-flanking nucleotides and forms a monomeric parallel quadruplex (G4) with a blunt-ended 3'-outer tetrad under the solution conditions employed. Analysis of ITC isotherms reveals multiple binding equilibria with the initial formation of a 1:2 ligand/quadruplex complex. Evaluation of electrophoretic mobilities as well as NMR spectral data confirm ligand-induced dimerization of MYC3 quadruplexes with the ligand sandwiched between the two 3'-outer tetrads. Additional ligand molecules in excess bind to the 5'-outer tetrads of the sandwich complex. Such a ligand-promoted G4 dimerization may be exploited for the controlled assembly or disassembly of G4 aggregates to expand on present quadruplex-based technologies.
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