2020; Physical and Mathematical Sciences, 54(2 (252): 115–122
Shared with The Gufo

THE INFLUENCE OF UREA ON G-QUADRUPLEX AND i-MOTIF STRUCTURES IN COMPLEMENTARY DNA SEQUENCES

Dalyan Dalyan*, L.G. Aslanyan, I.V. Vardanyan

Received: 2025-01-29 · Published: 2020-08-17

© 2020 The Author(s) and the original publisher.

CC BY-NC 4.0 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Shared article.
Original title
THE INFLUENCE OF UREA ON G-QUADRUPLEX AND i-MOTIF STRUCTURES IN COMPLEMENTARY DNA SEQUENCES
Authors
Dalyan Dalyan, L.G. Aslanyan, I.V. Vardanyan
Published
2020-08-17
Licence
Creative Commons Attribution-NonCommercial 4.0 International
Original
https://doi.org/10.46991/PYSU:A/2020.54.2.115

Abstract

In the present study, the methods of circular dichroism and UV/Vis spectrophotometry were used to study the influence of urea on the structural transitions i-motif ⇆ unfolded single strand in cytosine-rich d[3′-(CCCAAT)3CCC-5)′] region of telomeric DNA (Tel22C) and G-quadruplex ⇆ unfolded single strand in complementary guanine-rich strand d[5′-A(GGGTTA)3GGG-3′] (Tel22G) at pH 5.5 and 400 mM Na+. Under these conditions, Tel22C and Tel22G were found to form stable i-motif and G-quadruplex structures. It has been shown that urea (0-8 M) destabilizes the i-motif and G-quadruplex structures, but unlike thermal denaturation, it does not destroy the structures completely. The melting processes of G-quadruplex and i-motif are separated in the temperature scale (at any concentration of urea, the melting of the G-quadruplex starts at temperatures where the melting of the i-motifs has already been completed).
1 / ? 100% Open in new tab Download Cite

Loading the full text…

Download Follow Updates