Delineation of G-Quadruplex Alkylation Sites Mediated by 3,6-Bis(1-methyl-4-vinylpyridinium iodide)carbazole-Aniline Mustard Conjugates

Chemistry : a European Journal
Chien-Han ChenChao-Tsen Chen

Abstract

A new G-quadruplex (G-4)-directing alkylating agent BMVC-C3M was designed and synthesized to integrate 3,6-bis(1-methyl-4-vinylpyridinium iodide)carbazole (BMVC) with aniline mustard. Various telomeric G-4 structures (hybrid-2 type and antiparallel) and an oncogene promoter, c-MYC (parallel), were constructed to react with BMVC-C3M, yielding 35 % alkylation yield toward G-4 DNA over other DNA categories (<6 %) and high specificity under competition conditions. Analysis of the intact alkylation adducts by electrospray ionization mass spectroscopy (ESI-MS) revealed the stepwise DNA alkylation mechanism of aniline mustard for the first time. Furthermore, the monoalkylation sites and intrastrand cross-linking sites were determined and found to be dependent on G-4 topology based on the results of footprinting analysis in combination with mass spectroscopic techniques and in silico modeling. The results indicated that BMVC-C3M preferentially alkylated at A15 (H26), G12 (H24), and G2 (c-MYC), respectively, as monoalkylated adducts and formed A15-C3M-A21 (H26), G12-C3M-G4 (H24), and G2-C3M-G4/G17 (c-MYC), respectively, as cross-linked dialkylated adducts. Collectively, the stability and site-selective cross-linking capacity of BMVC-C3M...Continue Reading

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Citations

Jan 9, 2018·Nucleic Acids Research·Kazumitsu OnizukaFumi Nagatsugi
Jun 13, 2019·Nucleic Acids Research·Kazumitsu OnizukaFumi Nagatsugi
Feb 12, 2021·Organic & Biomolecular Chemistry·Kazumitsu OnizukaFumi Nagatsugi

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