Predicting RNA pseudoknot folding thermodynamics.

Predicting RNA pseudoknot folding thermodynamics.
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预测RNA伪折叠热力学。

DOI:
10.1093/nar/gkl346
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发表时间:
2006
影响因子:
14.9
通讯作者:
Chen, Shi-Jie
Chen, Shi-Jie
中科院分区:
生物学2区
文献类型:
--
作者:
Cao, Song;Chen, Shi-Jie

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Based on the experimentally determined atomic coordinates for RNA helices and the self-avoiding walks of the P (phosphate) and C4 (carbon) atoms in the diamond lattice for the polynucleotide loop conformations, we derive a set of conformational entropy parameters for RNA pseudoknots. Based on the entropy parameters, we develop a folding thermodynamics model that enables us to compute the sequence-specific RNA pseudoknot folding free energy landscape and thermodynamics. The model is validated through extensive experimental tests both for the native structures and for the folding thermodynamics. The model predicts strong sequence-dependent helix-loop competitions in the pseudoknot stability and the resultant conformational switches between different hairpin and pseudoknot structures. For instance, for the pseudoknot domain of human telomerase RNA, a native-like and a misfolded hairpin intermediates are found to coexist on the (equilibrium) folding pathways, and the interplay between the stabilities of these intermediates causes the conformational switch that may underlie a human telomerase disease.
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