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
中科院分区:
文献类型:
--
作者:
Kumari, Sunita;Bugaut, Anthony;Balasubramanian, Shankar
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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