The Folding Landscapes of Human Telomeric RNA and DNA G-Quadruplexes are Markedly Different.

ABSTRACT: We investigated the folding kinetics of G-quadruplex (G4) structures by comparing the K⁺ -induced folding of an RNA G4 derived from the human telomeric repeat-containing RNA (TERRA25) with a sequence homologous DNA G4 (wtTel25) using CD spectroscopy and real-time NMR spectroscopy. While DNA G4 folding is biphasic, reveals kinetic partitioning and involves kinetically favoured off-pathway intermediates, RNA G4 folding is faster and monophasic. The differences in kinetics are correlated to the differences in the folded conformations of RNA vs. DNA G4s, in particular with regard to the conformation around the glycosidic torsion angle χ that uniformly adopts anti conformations for RNA G4s and both, syn and anti conformation for DNA G4s. Modified DNA G4s with ¹⁹ F bound to

SUBMITTER: Muller D 

PROVIDER: S-EPMC8252441 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature