Testing the nearest neighbor model for canonical RNA base pairs: revision of GU parameters.
Testing the nearest neighbor model for canonical RNA base pairs: revision of GU parameters.
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测试最接近的邻居模型的规范RNA碱基对:GU参数的修订。
DOI:
10.1021/bi3002709
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发表时间:
2012-04-24
期刊:
影响因子:
2.9
通讯作者:
Serra MJ
中科院分区:
文献类型:
--
作者:
Chen JL;Dishler AL;Kennedy SD;Yildirim I;Liu B;Turner DH;Serra MJ
Thermodynamic parameters for GU pairs are important for predicting the secondary structures of RNA and for finding genomic sequences that code for structured RNA. Optical melting curves were measured for 29 RNA duplexes with GU pairs to improve nearest neighbor parameters for predicting stabilities of helixes. The updated model eliminates a prior penalty assumed for terminal GU pairs. Six additional duplexes with the 5′GG/3′UU motif were added to the single representation in the previous database. This revises the ΔG°37 for the 5′GG/3′UU motif from an unfavorable 0.5 kcal/mol to a favorable −0.2 kcal/mol. Similarly, the ΔG°37 for the 5′UG/3′GU motif changes from 0.3 to −0.6 kcal/mol. The correlation coefficients between predicted and experimental ΔG°37, ΔH°, and ΔS° for the expanded database are 0.95, 0.89, and 0.87, respectively. The results should improve predictions of RNA secondary structure.
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