13C/15N-19F intermolecular REDOR NMR study of the interaction of TAR RNA with Tat peptides.

13C/15N-19F intermolecular REDOR NMR study of the interaction of TAR RNA with Tat peptides.
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DOI:
10.1021/ja1051439
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发表时间:
2010-12-22
影响因子:
15
通讯作者:
Drobny, Gary P.
Drobny, Gary P.
中科院分区:
化学1区
文献类型:
--
作者:
Huang, Wei;Varani, Gabriele;Drobny, Gary P.

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HIV TAR RNA与病毒调节蛋白达特的复合物引起了相当大的兴趣,但是这种相互作用的可塑性使得迄今为止不可能建立该复合物的结构。为了探索获得蛋白质-RNA复合物结构信息的新方法,我们在固态下对结合到包含达特的RNA结合部分的肽的TAR进行了13 C/15 N-19 F REDOR NMR实验。肽中的关键精氨酸被均匀地13 C和15 N标记,并且5-氟尿苷被掺入TAR的U23位置。REDOR辐射导致13 C和15 N共振的退相,表明U23(5 F)-C和U23(5 F)-N自旋对的接近。REDOR数据的最佳拟合表明,U23(5 F)-C距离和U23(5 F)-N距离与从达特与TAR的部分络合物的溶液NMR结构获得的距离良好一致。这些结果表明,它是可能的,研究蛋白质-RNA复合物使用固态REDOR NMR测量,添加到一个不断增长的列表中的固态技术研究蛋白质-核酸复合物。
The complex of the HIV TAR RNA with the viral regulatory protein Tat is of considerable interest, but the plasticity of this interaction has made it impossible so far to establish the structure of that complex. In order to explore a new approach to obtain structural information on protein-RNA complexes, we performed 13C/15N-19F REDOR NMR experiments in the solid state on TAR bound to a peptide comprising the RNA-binding section of Tat. A critical arginine in the peptide was uniformly 13C and 15N labeled and 5-fluorouridine was incorporated at the U23 position of TAR. REDOR irradiation resulted in dephasing of the 13C and 15N resonances, indicating proximity of the U23(5F)-C and U23(5F)-N spin pairs. Best fits to the REDOR data shows the U23(5F)-C distances and the U23(5F)-N distances are in good agreement with the distances obtained from solution NMR structures of partial complexes of Tat with TAR. These results demonstrate that it is possible to study protein-RNA complexes using solid-state REDOR NMR measurements, adding to a growing list of solid state techniques for studying protein-nucleic acid complexes.
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