Crystallographic structure of an RNA helix: [U(UA)6A]2
- 5 October 1989
- journal article
- Published by Elsevier BV in Journal of Molecular Biology
- Vol. 209 (3), 459-474
- https://doi.org/10.1016/0022-2836(89)90010-7
Abstract
The crystallographic structure of the synthetic oligoribonucleotide, U(UA)6A, has been solved at 2.25 Å resolution. The crystallographic refinement permitted the identification of 91 solvent molecules, with a final agreement factor of 13%. The molecule is a dimer of 14 base-pairs and shows the typical features of an A-type helix. However, the presence of two kinks causes a divergence from a straight helix. The observed deformation, which is stabilized by a few hydrogen bonds in the crystal packing, could be due to the relatively high (35 °C) temperature of crystallization. The complete analysis of the structure is presented. It includes the stacking geometries, the backbone conformation and the solvation.Keywords
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