Document Detail


Bidentate RNA-magnesium clamps: on the origin of the special role of magnesium in RNA folding.
MedLine Citation:
PMID:  21173199     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Magnesium plays a special role in RNA function and folding. Although water is magnesium's most common first-shell ligand, the oxyanions of RNA have significant affinity for magnesium. Here we provide a quantum mechanical description of first-shell RNA-magnesium and DNA-magnesium interactions, demonstrating the unique features that characterize the energetics and geometry of magnesium complexes within large folded RNAs. Our work focuses on bidentate chelation of magnesium by RNA or DNA, where multiple phosphate oxyanions enter the first coordination shell of magnesium. These bidentate RNA clamps of magnesium occur frequently in large RNAs. The results here suggest that magnesium, compared to calcium and sodium, has an enhanced ability to form bidentate clamps with RNA. Bidentate RNA-sodium clamps, in particular, are unstable and spontaneously open. Due to magnesium's size and charge density it binds more intimately than other cations to the oxyanions of RNA, so that magnesium clamps are stabilized not only by electrostatic interactions, but also by charge transfer, polarization, and exchange interactions. These nonelectrostatic components of the binding are quite substantial with the high charge and small interatomic distances within the magnesium complexes, but are less pronounced for calcium due to its larger size, and for sodium due to its smaller charge. Additionally, bidentate RNA clamps of magnesium are more stable than those with DNA. The source of the additional stability of RNA complexes is twofold: there is a slightly attenuated energetic penalty for ring closure in the formation of RNA bidentate chelation complexes and elevated electrostatic interactions between the RNA and cations. In sum, it can be seen why sodium and calcium cannot replicate the structures or energetics of RNA-magnesium complexes.
Authors:
Anton S Petrov; Jessica C Bowman; Stephen C Harvey; Loren Dean Williams
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-12-20
Journal Detail:
Title:  RNA (New York, N.Y.)     Volume:  17     ISSN:  1469-9001     ISO Abbreviation:  RNA     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-14     Completed Date:  2011-02-17     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  9509184     Medline TA:  RNA     Country:  United States    
Other Details:
Languages:  eng     Pagination:  291-7     Citation Subset:  IM    
Affiliation:
School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
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MeSH Terms
Descriptor/Qualifier:
DNA / chemistry,  metabolism
Ligands
Magnesium / chemistry*,  metabolism
Models, Molecular
Nucleic Acid Conformation
RNA / chemistry*,  metabolism
Chemical
Reg. No./Substance:
0/Ligands; 63231-63-0/RNA; 7439-95-4/Magnesium; 9007-49-2/DNA
Comments/Corrections

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