Distinct tRNA Accommodation Intermediates Observed on the Ribosome with the Antibiotics Hygromycin A and A201A.

Distinct tRNA Accommodation Intermediates Observed on the Ribosome with the Antibiotics Hygromycin A and A201A.
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DOI:
10.1016/j.molcel.2015.04.014
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发表时间:
2015-06-04
期刊:
影响因子:
16
通讯作者:
Wilson, Daniel N.
Wilson, Daniel N.
中科院分区:
生物学1区
文献类型:
--
作者:
Polikanov, Yury S.;Starosta, Agata L.;Juette, Manuel F.;Altman, Roger B.;Terry, Daniel S.;Lu, Wanli;Burnett, Benjamin J.;Dinos, George;Reynolds, Kevin A.;Blanchard, Scott C.;Steitz, Thomas A.;Wilson, Daniel N.

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多重耐药细菌的增加限制了目前批准的抗生素的有效性,导致人们对具有不同化学支架的抗生素重新产生兴趣。我们已经解决了与A-, P-和e -位点trna结合的Thermus thermophilus 70S核糖体的结构,并与含氨基环醇的抗生素hygromycin A (HygA)或核苷类抗生素A201A配合。这两种抗生素都结合在肽基转移酶中心,并阻挡A-tRNA的cca端进入肽基转移酶中心的a位点。单分子Förster共振能量转移(smFRET)实验表明,HygA和A201A特异性干扰A-tRNA的完全调节,导致tRNA调节中间体的存在,从而抑制肽键的形成。因此,我们的研究结果不仅揭示了HygA和A201A的作用机制,而且揭示了蛋白质合成过程中tRNA调节的基本过程。
The increase in multi-drug resistant bacteria is limiting the effectiveness of currently approved antibiotics, leading to a renewed interest in antibiotics with distinct chemical scaffolds. We have solved the structures of the Thermus thermophilus 70S ribosome with A-, P- and E-site tRNAs bound, and in complex with either the aminocyclitol-containing antibiotic hygromycin A (HygA) or the nucleoside antibiotic A201A. Both antibiotics bind at the peptidyl transferase center and sterically occlude the CCA-end of the A-tRNA from entering the A-site of the peptidyl transferase center. Single-molecule Förster resonance energy transfer (smFRET) experiments reveal that HygA and A201A specifically interfere with full accommodation of the A-tRNA, leading to the presence of tRNA accommodation intermediates, and thereby inhibiting peptide bond formation. Thus, our results provide not only insight into the mechanism of action of HygA and A201A, but also into the fundamental process of tRNA accommodation during protein synthesis.
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