A new NMR solution structure of the SL1 HIV-1Lai loop-loop dimer.

A new NMR solution structure of the SL1 HIV-1Lai loop-loop dimer.
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DOI:
10.1093/nar/gkj427
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发表时间:
2006
影响因子:
14.9
通讯作者:
Lancelot G
Lancelot G
中科院分区:
生物学2区
文献类型:
--
作者:
Kieken F;Paquet F;Brulé F;Paoletti J;Lancelot G

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基因组RNA的二聚化与病毒粒子的降解和成熟事件直接相关。二聚化的起始序列是发夹环SL 1中的短的自身互补区。我们在这里描述了一个新的解决方案结构的RNA二聚化起始位点(DIS)的HIV-1 Lai。核磁共振脉冲场梯度自旋回波技术和多维异质结核磁共振光谱表明,这种结构是由六个沃森-克里克GC碱基对连接的两个发夹。茎和环之间的铰链通过涉及A8、A9和A16腺嘌呤的分子内和分子间相互作用来稳定。结构中存在的三个A型螺旋的同轴排列得到了先前晶体学分析的支持,但A8和A9腺嘌呤被发现处于凸起的位置。这些数据表明,存在一个平衡之间的凸出和凸出的构象在溶液中。
Dimerization of genomic RNA is directly related with the event of encapsidation and maturation of the virion. The initiating sequence of the dimerization is a short autocomplementary region in the hairpin loop SL1. We describe here a new solution structure of the RNA dimerization initiation site (DIS) of HIV-1Lai. NMR pulsed field-gradient spin-echo techniques and multidimensional heteronuclear NMR spectroscopy indicate that this structure is formed by two hairpins linked by six Watson–Crick GC base pairs. Hinges between the stems and the loops are stabilized by intra and intermolecular interactions involving the A8, A9 and A16 adenines. The coaxial alignment of the three A-type helices present in the structure is supported by previous crystallography analysis but the A8 and A9 adenines are found in a bulged in position. These data suggest the existence of an equilibrium between bulged in and bulged out conformations in solution.
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发表时间: 1997-05-01
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