Unraveling the Thermodynamics of the Folding and Interconversion of Human Telomere G-Quadruplexes.
Angew Chem Int Ed Engl
; 55(35): 10340-4, 2016 08 22.
Article
em En
| MEDLINE
| ID: mdl-27484724
ABSTRACT
Why human telomere DNA fragments fold into different G-quadruplex structures with parallel, hybrid, and antiparallel strand orientations depending on the temperature and concentration of co-solutes remains poorly understood. Similarly, the formation of intermediate structures along the folding or interconversion pathways is not well understood. Herein, we address these questions by introducing a conceptual framework, based on the global thermodynamic analysis of DSC and CD spectroscopy data, which led to a detailed description of the topological phase space (phase diagram) of the stability of the human telomere fragment 5'-AGGG(TTAGGG)3 -3' (Tel22). This framework clarifies the driving forces of quadruplex folding and interconversion processes over a wide range of temperatures and ion (K(+) , Na(+) ) and polyethylene glycol (PEG) concentrations and demonstrates their linkage to the human telomere DNA structural features.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Termodinâmica
/
DNA
/
Telômero
/
Quadruplex G
Limite:
Humans
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Eslovênia