1s9l
From Proteopedia
NMR Solution Structure of a Parallel LNA Quadruplex
Overview
The solution structure of a locked nucleic acid (LNA) quadruplex, formed by the oligomer d(TGGGT), containing only conformationally restricted LNA residues is reported. NMR and CD spectroscopy, as well as molecular dynamics and mechanic calculations, has been used to characterize the complex. The molecule adopts a parallel stranded conformation with a 4-fold rotational symmetry, showing a right-handed helicity and the guanine residues in an almost planar conformation with three well-defined G-tetrads. The thermal stability of Q-LNA has been found to be comparable with that of [r(UGGGU)]4, while a T(m) increment of 20 degrees C with respect to the corresponding DNA quadruplex structure [d(TGGGT)]4 has been observed. The structural features of the LNA quadruplex reported here may open new perspectives for the biological application of LNAs as novel versatile tools to design aptamer or catalyst oligonucleotides.
About this Structure
Full crystallographic information is available from OCA.
Reference
NMR solution structure of a parallel LNA quadruplex., Randazzo A, Esposito V, Ohlenschlager O, Ramachandran R, Mayola L, Nucleic Acids Res. 2004 Jun 4;32(10):3083-92. Print 2004. PMID:15181173 Page seeded by OCA on Sat May 3 08:27:18 2008
