Unusual base pairing during the decoding of a stop codon by the ribosome.

Unusual base pairing during the decoding of a stop codon by the ribosome.
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DOI:
10.1038/nature12302
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发表时间:
2013-08-01
期刊:
影响因子:
64.8
通讯作者:
Ramakrishnan, V.
Ramakrishnan, V.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Fernandez, Israel S.;Chyan Leong Ng;Kelley, Ann C.;Wu, Guowei;Yu, Yi-Tao;Ramakrishnan, V.

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在正常翻译过程中,释放因子与三个终止密码子(UGA、UAA或UAG)之一的结合导致蛋白质合成终止。然而,将初始尿苷修饰为假尿苷(pseudouridine,tRNA)允许通过转移RNA(transfer RNA,tRNA)有效识别和通读这些终止密码子,尽管它需要形成两个通常禁止的嘌呤-嘌呤碱基对。我们已经确定了30 S核糖体亚基与tRNASer的反密码子茎环复合物的晶体结构,该反密码子茎环结合到A位点中的HLAG终止密码子。在第一个位置上的碱基对伴随着在密码子的第二个和第三个位置上的嘌呤-嘌呤碱基对的形成,其显示出不寻常的Watson-Crick/Hoogsteen几何形状。该结构显示了核糖体解码中心容纳非规范碱基对的先前未被怀疑的能力。
During normal translation, binding of a release factor to one of the three stop codons (UGA, UAA or UAG) results in termination of protein synthesis. However, modification of the initial uridine to a pseudouridine (Ψ) allows efficient recognition and read-through of these stop codons by a transfer RNA (tRNA), although it requires formation of two normally forbidden purine-purine base pairs. We have determined the crystal structure at 3.1 Å resolution of the 30S ribosomal subunit in complex with the anticodon stem loop of tRNASer bound to the ΨAG stop codon in the A site. The ΨA base pair at the first position is accompanied by the formation of purine-purine base pairs at the second and third positions of the codon, which display an unusual Watson-Crick/Hoogsteen geometry. The structure shows a previously unsuspected ability of the ribosomal decoding center to accommodate non-canonical base pairs.
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