Switching the type of V-loop in sugar-modified G-quadruplexes through altered fluorine interactions.
Haase, L., Weisz, K.(2020) Chem Commun (Camb) 56: 4539-4542
- PubMed: 32202271
- DOI: https://doi.org/10.1039/d0cc01285h
- Primary Citation of Related Structures:
6TC8, 6TCG - PubMed Abstract:
Mixed 2'-F-riboguanosine and 2'-F-arabinoguanosine disubstitutions of a hybrid-type G-quadruplex are found to induce a refolding into two alternative structures with different types of V-loops upon positional exchange of the two G analogs. While conformational preferences of the incorporated G surrogates fail to fully account for the observed rearrangements, additional hydrogen bonds with a fluorine acceptor are suggested to be critical determinants of the two distinct V-loop conformers imposing different tetrad polarities.
Organizational Affiliation:
Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Str. 4, D-17489 Greifswald, Germany. weisz@uni-greifswald.de.