The role of RNA structure in translational regulation by L7Ae protein in archaea.

The role of RNA structure in translational regulation by L7Ae protein in archaea.
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DOI:
10.1261/rna.068510.118
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发表时间:
2019-01
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Lilley DMJ
Lilley DMJ
中科院分区:
其他
文献类型:
--
作者:
Huang L;Ashraf S;Lilley DMJ

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最近的一项研究表明,古生菌L7Ae与其结构基因mRNA5‘端的k-转弯结构相结合,以调节翻译。为了发挥调节作用,RNA在没有蛋白质的情况下应该是非结构的,但它应该在结合L7Ae上采用一个包含k-转角的茎环。对UTR序列的序列分析表明,在没有L7Ae的情况下,它们的k-转角元件将无法折叠,我们已经在溶液中使用FRET对Archaeoglobus fulgidus序列进行了实验证明。我们已经解决了黄曲霉RNA与其同源L7Ae蛋白结合的复合体的X射线晶体结构。RNA采用了L7Ae蛋白特异识别的标准k-转角构象,从而稳定了茎环。对自然序列UTR的在线探测表明,在没有L7Ae结合的情况下,RNA是非结构的,但在结合蛋白质时折叠,从而使核糖体结合部位被遮挡。因此,L7Ae通过改变RNA的构象来调节自己的翻译,以改变可及性。
A recent study has shown that archaeal L7Ae binds to a putative k-turn structure in the 5′-leader of the mRNA of its structural gene to regulate translation. To function as a regulator, the RNA should be unstructured in the absence of protein, but it should adopt a k-turn-containing stem–loop on binding L7Ae. Sequence analysis of UTR sequences indicates that their k-turn elements will be unable to fold in the absence of L7Ae, and we have demonstrated this experimentally in solution using FRET for the Archaeoglobus fulgidus sequence. We have solved the X-ray crystal structure of the complex of the A. fulgidus RNA bound to its cognate L7Ae protein. The RNA adopts a standard k-turn conformation that is specifically recognized by the L7Ae protein, so stabilizing the stem–loop. In-line probing of the natural-sequence UTR shows that the RNA is unstructured in the absence of L7Ae binding, but folds on binding the protein such that the ribosome binding site is occluded. Thus, L7Ae regulates its own translation by switching the conformation of the RNA to alter accessibility.
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