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.
中科院分区:
文献类型:
--
作者:
Fernandez, Israel S.;Chyan Leong Ng;Kelley, Ann C.;Wu, Guowei;Yu, Yi-Tao;Ramakrishnan, V.
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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