Position and stability are determining factors for translation repression by an RNA G-quadruplex-forming sequence within the 5' UTR of the NRAS proto-oncogene.

Position and stability are determining factors for translation repression by an RNA G-quadruplex-forming sequence within the 5' UTR of the NRAS proto-oncogene.
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DOI:
10.1021/bi8010797
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发表时间:
2008-12-02
期刊:
影响因子:
2.9
通讯作者:
Balasubramanian, Shankar
Balasubramanian, Shankar
中科院分区:
生物学3区
文献类型:
--
作者:
Kumari, Sunita;Bugaut, Anthony;Balasubramanian, Shankar

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mRNA 5'非翻译区 (UTR) 中的核酸二级结构已被证明在翻译调控中发挥着关键作用。我们最近证明,天然存在的、保守且稳定的 RNA G 四链体元件 (5'-GGGAGGGGCGGGUCUGGG-3') 位于 NRAS 原癌基因 mRNA 5' UTR 内的 5' 帽附近,可在翻译水平调节基因表达。在此,我们表明 NRAS 5'UTR 中的 G-四链体基序的翻译效果并不统一,而是取决于 G-四链体形成序列的位置。当 RNA G 四链体形成序列位于 NRAS 原癌基因 5' UTR 中第一个 50 nt 内相对接近 5' 端时,它会抑制翻译,而如果位于相对远离 5' 端的位置,则对翻译没有显着影响。我们还证明,RNA G 四链体在 NRAS 5' UTR 内自然位置的热力学稳定性是其抑制翻译能力的一个重要因素。
Nucleic acid secondary structures in the 5′ untranslated regions (UTRs) of mRNAs have been shown to play a critical role in translation regulation. We recently demonstrated that a naturally occurring, conserved, and stable RNA G-quadruplex element (5′-GGGAGGGGCGGGUCUGGG-3′), located close to the 5′ cap within the 5′ UTR of the NRAS proto-oncogene mRNA, modulates gene expression at the translational level. Herein, we show that the translational effect of this G-quadruplex motif in NRAS 5′ UTR is not uniform, but rather depends on the location of the G-quadruplex-forming sequence. The RNA G-quadruplex-forming sequence represses translation when situated relatively proximal to the 5′ end, within the first 50 nt, in the 5′ UTR of the NRAS proto-oncogene, whereas it has no significant effect on translation if located comparatively away from the 5′ end. We have also demonstrated that the thermodynamic stability of the RNA G-quadruplex at its natural position within the NRAS 5′ UTR is an important factor contributing toward its ability to repress translation.
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