906749-05-1Relevant articles and documents
Effects of 8-methyl-2′-deoxyadenosine incorporation into quadruplex forming oligodeoxyribonucleotides
Virgilio, Antonella,Esposito, Veronica,Randazzo, Antonio,Mayol, Luciano,Galeone, Aldo
, p. 1037 - 1044 (2005)
In this paper we report the synthesis and the structural characterization of two modified oligodeoxyribonucleotides (ODNs), namely d(A8MeGGGT) and d(TA8MeGGGT), where A8Me represents a 8-methyl-2′-deoxyadenosine. Both ODNs have been studied by 1H NMR, CD spectroscopy and molecular modelling and shown to form fourfolds symmetric G-quadruplex structures, with all strands parallel and equivalent to each other. The complexes are characterized by thermal stabilities comparable to that of their natural counterparts. NOE patterns involving 8-methyl group in A8Me residues allowed us to define the main structural features at the 5′-end of the complexes. Particularly, inter- and intrastrand NOEs show a syn-orientation and a symmetrical arrangement of A8Me bases stacking on the adjacent G-tetrad.