The ABC-F protein EttA gates ribosome entry into the translation elongation cycle.

The ABC-F protein EttA gates ribosome entry into the translation elongation cycle.
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DOI:
10.1038/nsmb.2740
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发表时间:
2014-02
影响因子:
16.8
通讯作者:
Hunt JF
Hunt JF
中科院分区:
生物学1区
文献类型:
--
作者:
Boël G;Smith PC;Ning W;Englander MT;Chen B;Hashem Y;Testa AJ;Fischer JJ;Wieden HJ;Frank J;Gonzalez RL Jr;Hunt JF

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ABC-F蛋白是三磷酸腺苷结合盒(ABC)超家族中分布最广泛的分支之一,但其功能特征一直未能得到证实。在这里,我们证明了YjjK,最普遍的真细菌ABC-F蛋白,通过对ATP/ADP比率敏感的核苷酸依赖的相互作用,使核糖体进入翻译延长循环。因此,我们将该蛋白质重命名为能量依赖的翻译节流阀A(ETTA)。我们确定了大肠杆菌Etta的晶体结构,并利用它设计了用于生化研究的突变体,包括蛋白质合成初始步骤的酶学分析。这些研究表明,ETTA可能调节能量耗竭细胞的蛋白质合成,因为能量耗竭细胞的ATP/ADP比率较低。与这一推论一致,ΔETTA细胞在长期稳定期表现出严重的适应性缺陷。这些研究表明,ABC-F蛋白通过一种对细胞能量状态敏感的新机制来调节蛋白质的合成。
ABC-F proteins have evaded functional characterization even though they comprise one of the most widely distributed branches of the ATP-binding cassette (ABC) superfamily. Herein, we demonstrate that YjjK, the most prevalent eubacterial ABC-F protein, gates ribosome entry into the translation elongation cycle through a nucleotide-dependent interaction sensitive to ATP/ADP ratio. Accordingly, we rename this protein Energy-dependent Translational Throttle A (EttA). We determined the crystal structure of Escherichia coli EttA and used it to design mutants for biochemical studies, including enzymological assays of the initial steps of protein synthesis. These studies suggest that EttA may regulate protein synthesis in energy-depleted cells, which have a low ATP/ADP ratio. Consistent with this inference, ΔettA cells exhibit a severe fitness defect in long-term stationary phase. These studies demonstrate that an ABC-F protein regulates protein synthesis via a novel mechanism sensitive to cellular energy status.
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