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- W1968803000 abstract "We have studied the formation and structural properties of quadruplexes of the human telomeric DNA sequence G3(T2AG3)3 and related sequences in which each guanine base was replaced by an adenine base. None of these single base substitutions hindered the formation of antiparallel quadruplexes, as shown by circular dichroism, gel electrophoresis, and UV thermal stability measurements in NaCl solutions. Effect of substitution did differ, however, depending on the position of the substituted base. The A-for-G substitution in the middle quartet of the antiparallel basket scaffold led to the most distorted and least stable structures and these sequences preferred to form bimolecular quadruplexes. Unlike G3(T2AG3)3, no structural transitions were observed for the A-containing analogs of G3(T2AG3)3 when sodium ions were replaced by potassium ions. The basic quadruplex topology remained the same for all sequences studied in both salts. As in vivo misincorporation of A for a G in the telomeric sequence is possible and potassium is a physiological salt, these findings may have biological relevance." @default.
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- W1968803000 date "2009-02-01" @default.
- W1968803000 modified "2023-10-15" @default.
- W1968803000 title "Substitution of adenine for guanine in the quadruplex-forming human telomere DNA sequence G3(T2AG3)3" @default.
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- W1968803000 doi "https://doi.org/10.1016/j.biochi.2008.07.012" @default.
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