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First look at RNA in L-configuration.

机译:首先看看L-configuration RNA。

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摘要

Nucleic acid molecules in the mirror image or L-configuration are unknown in nature and are extraordinarily resistant to biological degradation. The identification of functional L-oligonucleotides called Spiegelmers offers a novel approach for drug discovery based on RNA. The sequence r(CUGGGCGG).r(CCGCCUGG) was chosen as a model system for structural analysis of helices in the L-configuration as the structure of the D-form of this sequence has previously been determined in structural studies of 5S RNA domains, in particular domain E of the Thermus flavus 5S rRNA [Perbandt et al. (2001), Acta Cryst. D57, 219-224]. Unexpectedly, the results of crystallization trials showed little similarity between the D- and the L-forms of the duplex in either the crystallization hits or the diffraction performance. The crystal structure of this L-RNA duplex has been determined at 1.9 A resolution with R(work) and R(free) of 23.8 and 28.6%, respectively. The crystals belong to space group R32, with unit-cell parametersa = 45.7, c = 264.6 A. Although there are two molecules in the asymmetric unit rather than one, the structure of the L-form arranges helical pairs in a head-to-tail fashion to form pseudo-continuous infinite helices in the crystal as in the D-form. On the other hand, the wobble-like G.C(+) base pair seen in the D-RNA analogue does not appear in the L-RNA duplex, which forms a regular double-helical structure with typical Watson-Crick base pairing.
机译:在镜像或核酸分子L-configuration在本质上是未知的,非常耐生物退化。L-oligonucleotides称为Spiegelmers提供基于RNA药物发现的新途径。序列r (CUGGGCGG) r (CCGCCUGG)被选中作为一个模型系统的结构分析在L-configuration螺旋结构此前的d序列确定5 s RNA的结构的研究域,在特定领域E栖热菌属番饷rRNA [Perbandt et al .(2001)《行动纲领》,结晶的。结晶试验显示D -和L-forms之间的相似性在结晶击中或双工衍射性能。这L-RNA双工已被确定为1.9分辨率与R(工作)和23.8(免费)28.6%,分别。c组R32,单胞parametersa = 45.7, =264.6。的结构不对称单位,而不是一个在一个l形安排螺旋对时尚形成pseudo-continuous头部到尾部无限的螺旋晶体d。另一方面,wobble-like里(+)基地一对D-RNA模拟没有出现L-RNA双工的常规形式与典型的双螺旋结构沃森克里克碱基配对。

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