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Towards the 3D structure of 5S rRNA

机译:迈向5S rRNA的3D结构

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The ribosomal 5S RNA is approximately 120 nucleotides long and is an integral part of the large ribosomal subunit. Several parts of the 5S rRNA interact specifically with several ribosomal proteins. Nevertheless its precise role in protein synthesis remains unclear. It is clear that reconstituted 50S ribosomal subunits, lacking the 5S rRNA, are inactive in proteinbiosynthesis. Structural studies will support a more detailed understanding of the 5S rRNA function. Our extensive attempts to crystallise ribosomal 5S RNA have led to crystals, which diffract to about 7.5A. For the investigation of some special features like GU basepairs and hairpin-loops in the ribosomal 5S RNA from Thermus flavus we have divided the 5S rRNA into five domains (A to E) and have solved three crystal structures (Figure 1): Helix I of domain A has been determined at 2.4A. Helix V of domain E without the terminal hairpin-loop has been determined at 1.6A and Helix V of domain E including the terminal hairpin-loop has been determined at 3.0A. Furthermore it was possible to observe a general mode of intermolecular interaction, which occur only in RNA structures and it was possible to demonstrate the structural importance of water molecules for the stability of RNA-molecules.
机译:核糖体5S RNA长约120个核苷酸,是大核糖体亚基的组成部分。 5S rRNA的几个部分与几种核糖体蛋白特异性相互作用。然而,其在蛋白质合成中的确切作用仍不清楚。显然,缺乏5S rRNA的重组50S核糖体亚基在蛋白质生物合成中没有活性。结构研究将支持对5S rRNA功能的更详细的了解。我们广泛尝试使核糖体5S RNA结晶,导致晶体衍射至约7.5A。为了研究Thermus flavus核糖体5S RNA中GU碱基对和发夹环的某些特殊特征,我们将5S rRNA分为五个结构域(A到E),并解析了三个晶体结构(图1):域A已确定为2.4A。没有末端发夹环的结构域E的螺旋V已确定为1.6A,包括末端发夹环的结构域E的螺旋V已确定为3.0A。此外,有可能观察到仅在RNA结构中发生的分子间相互作用的一般模式,并且有可能证明水分子对RNA分子的稳定性的结构重要性。

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