Regulation of gene expression by macrolide-induced ribosomal frameshifting.

Regulation of gene expression by macrolide-induced ribosomal frameshifting.
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通过大环内酯类诱导的核糖体框架调节基因表达。

DOI:
10.1016/j.molcel.2013.10.013
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发表时间:
2013-12-12
期刊:
影响因子:
16
通讯作者:
Vazquez-Laslop, Nora
Vazquez-Laslop, Nora
中科院分区:
生物学1区
文献类型:
--
作者:
Gupta, Pulkit;Kannan, Krishna;Mankin, Alexander S.;Vazquez-Laslop, Nora

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许多基因的表达受上游 ORF (uORF) 控制。通常,核糖体通过调节性 uORF 的进展(取决于细胞的生理状态)会影响下游基因的表达。在诱导大环内酯类抗性基因的经典机制中,抗生素促进 uORF 内的翻译停滞;静态核糖体诱导 mRNA 构象变化,导致抗性顺反子翻译激活。我们发现,酮内酯抗生素不会诱导核糖体在 ermC 抗性基因的 uORF 处停滞,而是通过一种全新的机制触发其表达。酮内酯促进 uORF 处的移码,允许翻译核糖体侵入基因间间隔区。 mRNA 结构的动态展开导致抵抗力的激活。从概念上讲,类似的机制可能控制其他细胞基因。酮内酯降低阅读框维护保真度的先前未知特性可能具有医学意义。
Expression of many genes is controlled by upstream ORFs (uORFs). Typically, the progression of the ribosome through a regulatory uORF, which depends on the physiological state of the cell, influences the expression of the downstream gene. In the classic mechanism of induction of macrolide resistance genes, antibiotics promote translation arrest within the uORF; static ribosome induces a conformational change in mRNA resulting in activation of translation of the resistance cistron. We show that ketolide antibiotics, which do not induce ribosome stalling at the uORF of the ermC resistance gene, trigger its expression via a principally new mechanism. Ketolides promote frameshifting at the uORF allowing the translating ribosome to invade the intergenic spacer. The dynamic unfolding of the mRNA structure leads to activation of resistance. Conceptually similar mechanisms may control other cellular genes. The previously unknown property of ketolides to reduce the fidelity of reading frame maintenance may have medical implications.
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