Journal: Chemistry (Weinheim an Der Bergstrasse, Germany)
Article Title: Controlling Topology of a Telomeric G‐quadruplex DNA With a Chemical Cross‐link
doi: 10.1002/chem.202501467
Figure Lengend Snippet: Modified nucleosides used to introduce 1,4‐disubstituted triazole cross‐links into G4 DNA. Top: commercially available 2′‐ O ‐propargylguanosine phosphoramidite ( Y ‐monomer); bottom: N 6 ‐modified adenosine H‐phosphonate containing azide ( Z ‐monomer). These modifications were incorporated during DNA synthesis and then cross‐linked post‐synthetically to form the thermodynamically trapped G4s shown. A G3A8 cross‐link in the 12‐mer telomeric sequence is proposed to reinforce the parallel G4 topology shown in (A) whereas a G5A8 cross‐link should form a G4 of antiparallel topology shown in (B).
Article Snippet: Standard 5′‐ O ‐DMT‐3′‐ O ‐phosphoramidites of nucleosides were obtained from Innovassynth Technologies (I) Ltd (India) and the 2′‐ O ‐propargylguanosine phosphoramidite was obtained from Chemgenes Corporation (USA).
Techniques: Modification, Introduce, DNA Synthesis, Sequencing