Labeled EF-Tus for rapid kinetic studies of pretranslocation complex formation.

Labeled EF-Tus for rapid kinetic studies of pretranslocation complex formation.
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DOI:
10.1021/cb500409y
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发表时间:
2014-10-17
影响因子:
4
通讯作者:
Cooperman, Barry S.
Cooperman, Barry S.
中科院分区:
生物学2区
文献类型:
--
作者:
Liu, Wei;Kavaliauskas, Darius;Schrader, Jared M.;Poruri, Kiran;Birkedal, Victoria;Goldman, Emanuel;Jakubowski, Hieronim;Mandecki, Wlodek;Uhlenbeck, Olke C.;Knudsen, Charlotte R.;Goldman, Yale E.;Cooperman, Barry S.

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普遍保守的翻译延伸因子EF-Tu以aa-tRNA·EF-Tu·GTP三元复合物(TC)的形式将氨酰基(aa)-tRNA递送至核糖体,在核糖体中其与核糖体A位点内的同源mRNA密码子结合,导致形成易位前(PRE)复合物。在这里,我们描述了在翻译延伸中起作用的变体E348 C-EF-Tu的QSY 9和Cy 5衍生物的制备。连同荧光团衍生物的aa-tRNA和核糖体蛋白L11,位于GT3相关的中心(GAC),这些标记的EF-Tus允许开发两个新的FRET检测,允许EF-Tu和L11(Tu-L11测定)和aa-tRNA(Tu-tRNA测定)之间的距离变化的动态解码过程中确定。我们使用这些试验来检查:(i)EF-Tu在解码过程中远离GAC和aa-tRNA移动的相对速率,(ii)误读诱导抗生素链霉素和巴龙霉素对A位点tRNA选择的影响,以及(iii)加强aa-tRNA与EF-Tu的结合如何影响EF-Tu远离核糖体上L11的移动速率。这些FRET测定具有适用于核糖体抗生素的高通量筛选的潜力。
The universally conserved translation elongation factor EF-Tu delivers aminoacyl(aa)-tRNA in the form of an aa-tRNA·EF-Tu·GTP ternary complex (TC) to the ribosome where it binds to the cognate mRNA codon within the ribosomal A-site, leading to formation of a pretranslocation (PRE) complex. Here we describe preparation of QSY9 and Cy5 derivatives of the variant E348C-EF-Tu that are functional in translation elongation. Together with fluorophore derivatives of aa-tRNA and of ribosomal protein L11, located within the GTPase associated center (GAC), these labeled EF-Tus allow development of two new FRET assays that permit the dynamics of distance changes between EF-Tu and both L11 (Tu-L11 assay) and aa-tRNA (Tu-tRNA assay) to be determined during the decoding process. We use these assays to examine: (i) the relative rates of EF-Tu movement away from the GAC and from aa-tRNA during decoding, (ii) the effects of the misreading-inducing antibiotics streptomycin and paromomycin on tRNA selection at the A-site, and (iii) how strengthening the binding of aa-tRNA to EF-Tu affects the rate of EF-Tu movement away from L11 on the ribosome. These FRET assays have the potential to be adapted for high throughput screening of ribosomal antibiotics.
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