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Int. J. Mol. Sci. 2016, 17(7), 988; doi:10.3390/ijms17070988

The X-ray Structures of Six Octameric RNA Duplexes in the Presence of Different Di- and Trivalent Cations

1
Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zürich CH-8057, Switzerland
2
Swiss Light Source, Paul Scherrer Institute, Villigen CH-5232, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Nick Hadjiliadis
Received: 6 May 2016 / Revised: 10 June 2016 / Accepted: 15 June 2016 / Published: 27 June 2016
(This article belongs to the Special Issue Applied Bioinorganic Chemistry and Selected Papers from 13th ISABC)
View Full-Text   |   Download PDF [2029 KB, uploaded 27 June 2016]   |  

Abstract

Due to the polyanionic nature of RNA, the principles of charge neutralization and electrostatic condensation require that cations help to overcome the repulsive forces in order for RNA to adopt a three-dimensional structure. A precise structural knowledge of RNA-metal ion interactions is crucial to understand the mechanism of metal ions in the catalytic or regulatory activity of RNA. We solved the crystal structure of an octameric RNA duplex in the presence of the di- and trivalent metal ions Ca2+, Mn2+, Co2+, Cu2+, Sr2+, and Tb3+. The detailed investigation reveals a unique innersphere interaction to uracil and extends the knowledge of the influence of metal ions for conformational changes in RNA structure. Furthermore, we could demonstrate that an accurate localization of the metal ions in the X-ray structures require the consideration of several crystallographic and geometrical parameters as well as the anomalous difference map. View Full-Text
Keywords: RNA; X-ray crystallography; bioinorganic chemistry; di- and trivalent cations RNA; X-ray crystallography; bioinorganic chemistry; di- and trivalent cations
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Schaffer, M.F.; Peng, G.; Spingler, B.; Schnabl, J.; Wang, M.; Olieric, V.; Sigel, R.K.O. The X-ray Structures of Six Octameric RNA Duplexes in the Presence of Different Di- and Trivalent Cations. Int. J. Mol. Sci. 2016, 17, 988.

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