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- W2474840168 abstract "Short guanine(G)-repeat and cytosine(C)-repeat DNA strands can self-assemble to form four-stranded G-quadruplexes and i-motifs, respectively. Herein, G-rich and C-rich strands with non-G or non-C terminal bases and different lengths of G- or C-repeats are mixed selectively in pH 4.5 and 6.7 ammonium acetate buffer solutions and studied by electrospray ionization mass spectrometry (ESI-MS). Various strand associations corresponding to bi-, tri- and tetramolecular ions are observed in mass spectra, indicating that the formation of quadruplex structures is a random strand by strand association process. However, with increasing incubation time for the mixtures, initially associated hybrid tetramers will transform into self-assembled conformations, which is mainly driven by the structural stability. The melting temperature values of self-assembled quadruplexes suggest that the length of G-repeats or C-repeats shows more significant effect on the stability of quadruplex structures than that of terminal residues. Accordingly, we can obtain the self-associated tetrameric species generated from the mixtures of various homologous G- or C-strands efficiently by altering the length of G- or C-repeats. Our studies demonstrate that ESI-MS is a very direct, fast and sensitive tool to provide significant information on DNA strand associations and stoichiometric transitions, particularly for complex mixtures. Copyright © 2016 John Wiley & Sons, Ltd." @default.
- W2474840168 created "2016-07-22" @default.
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- W2474840168 date "2016-09-06" @default.
- W2474840168 modified "2023-10-17" @default.
- W2474840168 title "Structural varieties of selectively mixed G- and C-rich short DNA sequences studied with electrospray ionization mass spectrometry" @default.
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- W2474840168 doi "https://doi.org/10.1002/jms.3804" @default.
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