2ap5
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(New page: 200px<br /><applet load="2ap5" size="350" color="white" frame="true" align="right" spinBox="true" caption="2ap5" /> '''Solution Structure of the C27A ScYLV P1-P2 F...)
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Revision as of 16:07, 29 January 2008
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Solution Structure of the C27A ScYLV P1-P2 Frameshifting Pseudoknot, Average Structure
Overview
The helical junction region of a -1 frameshift stimulating hairpin-type, mRNA pseudoknot from sugarcane yellow leaf virus (ScYLV) is characterized, by a novel C27.(G7-C14) loop 2-stem 1 minor groove base triple, which is, stacked on a C8+.(G12-C28) loop 1-stem 2 major groove base triple., Substitution of C27 with adenosine reduces frameshifting efficiency to a, level just twofold above the slip-site alone. Here, we show that the, global structure of the C27A ScYLV RNA is nearly indistinguishable from, the wild-type counterpart, despite the fact that the helical junction, region is altered and incorporates the anticipated isostructural, A27.(G7-C14) minor groove base triple. This interaction mediates a 2.3-A, displacement of C8+ driven by an A27 N6-C8+ O2 hydrogen bond as part of an, A(n-1).C+.G-Cn base quadruple. The helical junction regions of the C27A, ScYLV and the beet western yellows virus (BWYV) pseudoknots are, essentially superimposable, the latter of which contains an analogous, A25.(G7-C14) minor groove base triple. These results reveal that the, global ground-state structure is not strongly correlated with frameshift, stimulation and point to a reduced thermodynamic stability and/or enhanced, kinetic lability that derives from an altered helical junction, architecture in the C27A ScYLV RNA as a significant determinant for, setting frameshifting efficiencies in plant luteoviral mRNA pseudoknots.
About this Structure
2AP5 is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
The global structures of a wild-type and poorly functional plant luteoviral mRNA pseudoknot are essentially identical., Cornish PV, Stammler SN, Giedroc DP, RNA. 2006 Nov;12(11):1959-69. Epub 2006 Sep 25. PMID:17000902
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