Publication details

Diverse effects of naturally occurring base lesions on the structure and stability of the human telomere DNA quadruplex

Authors

KAŠPAROVÁ Helena DVOŘÁKOVÁ Zuzana RENČIUK Daniel BEDNÁŘOVÁ Klára KEJNOVSKÁ Iva TRANTÍREK Lukáš VORLÍČKOVÁ Michaela SAGI Janos

Year of publication 2015
Type Article in Periodical
Magazine / Source Biochimie
MU Faculty or unit

Central European Institute of Technology

Citation
Web Full Text
Doi http://dx.doi.org/10.1016/j.biochi.2015.07.013
Field Biochemistry
Keywords DNA secondary structure; Circular dichroism spectroscopy; Guanine quadruplex; Base modification; Oxidative damage
Description Various base lesions continuously form in cellular nucleic acids and the unrepaired lesions are promutagenic and procarcinogenic. Though natural base lesions have been extensively studied in double-stranded DNA models, these studies are only less than a decade old for non-canonical DNA models, such as quadruplexes. Here we present a report on the effects of three frequently occurring natural lesions that can form in the TTA loops on the structure of the human telomere quadruplex d[AG(3)(TTAG(3))(3)]. We compared the effect of the abasic site and 8-oxoadenine replacing adenine and 5-hydroxymethyluracil substituting for thymine. The results showed that the three lesions impacted the stability and quadruplex folding in markedly different ways. The effects depended on the type of lesion and the position in the sequence. Analogous lesions of guanine in the G-tetrads extensively destabilized the quadruplex and the effects depended more on the position than on the type of lesion. The distinct effects of the loop substitutions as well as comparison of the modifications of the loops and the quadruplex tetrads are discussed in this communication.
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