Structure, sequence and ion-exchange of left-handed G-quadruplexes

• 主要作者: Bakalar, Blaz
• 其他作者: Phan Anh Tuan
• 格式: Theses and Dissertations
• 語言: English
• 出版: 2019
• 主題: DRNTU::Science::Biological sciences::Biophysics
• 在線閱讀: https://hdl.handle.net/10356/106467; http://hdl.handle.net/10220/47993

Besides the canonical double-stranded helical B-DNA structure, DNA can form four-stranded G-quadruplex structures composed of stacked guanine G-tetrads. Until the recent first example of a left-handed structure named Z-G4, all solved G-quadruplex structures adopted a right-handed helical fold. We report on the discovery of five new left-handed G-quadruplex structures, including a minimal left-handed motif. These structures and associated findings help pave the way towards expanding the primary sequence requirements for left-handed G-quadruplexes. Cations are important for G-quadruplex assembly as they bind between stacked G-tetrads. We have observed a cation coordinated in Z-G4 that has an exchange time on the order of one hour at room temperature.