Hyperaccurate and error-prone ribosomes exploit distinct mechanisms during tRNA selection.

Hyperaccurate and error-prone ribosomes exploit distinct mechanisms during tRNA selection.
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超准确且容易出错的核糖体在 tRNA 选择过程中利用了不同的机制。

DOI:
10.1016/j.molcel.2010.06.009
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发表时间:
2010
期刊:
影响因子:
16
通讯作者:
Green,Rachel
Green,Rachel
中科院分区:
生物学1区
文献类型:
--
作者:
Zaher,HaniS;Green,Rachel

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Escherichia colistrains displaying hyperaccurate (restrictive) and ribosomal ambiguity (ram) phenotypes have long been associated with alterations inrpsLandrpsD/rpsE, respectively. Crystallographic evidence shows the ribosomal proteins S12 and S4/S5 (corresponding to these genes) to be located in separate regions of the small ribosomal subunit that are important for domain closure thought to take place during tRNA selection. Mechanistically, the process of tRNA selection is separated into two distinct phases, initial selection and proofreading. Here, we explore the effects of mutations inrpsLandrpsDon these steps. Surprisingly, bothrestrictiveandramribosomes primarily affect tRNA selection through alteration of the off rates of the near-cognate tRNA species but during distinct phases of the overall process (proofreading and initial selection, respectively). These observations suggest that closure interfaces (S12/h27/h44 versus S4/S5) in two distinct regions of the small ribosomal subunit function independently to promote high-fidelity tRNA selection.
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