1QVF

Structure of a deacylated tRNA minihelix bound to the E site of the large ribosomal subunit of Haloarcula marismortui

1QVF の概要

• エントリーDOI: 10.2210/pdb1qvf/pdb
• 関連するPDBエントリー: 1JJ2 1KQS 1QVG
• 分子名称: 23S ribosomal rna, 50S RIBOSOMAL PROTEIN L10E, L10 Ribosomal Protein, ... (37 entities in total)
• 機能のキーワード: ribosome 50s, protein-protein complex, rna-rna complex, protein-rna complex, ribosome
• 由来する生物種: Haloarcula marismortui; 詳細
• 細胞内の位置: Cytoplasm : P12743
• タンパク質・核酸の鎖数: 31
• 化学式量合計: 1467158.18

構造登録者

Schmeing, T.M.,Moore, P.B.,Steitz, T.A. (登録日: 2003-08-27, 公開日: 2003-11-11, 最終更新日: 2023-08-16)

主引用文献

Schmeing, T.M.,Moore, P.B.,Steitz, T.A.
Structures of deacylated tRNA mimics bound to the E site of the large ribosomal subunit
RNA, 9:1345-1352, 2003

PubMed Abstract: During translation, tRNAs cycle through three binding sites on the ribosome: the A, the P, and the E sites. We have determined the structures of complexes between the Haloarcula marismortui large ribosomal subunit and two different E site substrates: a deacylated tRNA acceptor stem minihelix and a CCA-acceptor end. Both of these tRNA mimics contain analogs of adenosine 76, the component responsible for a large proportion of E site binding affinity. They bind in the center of the loop-extension of protein L44e, and make specific contacts with both L44e and 23S rRNA including bases that are conserved in all three kingdoms of life. These contacts are consistent with the footprinting, protection, and cross-linking data that have identified the E site biochemically. These structures explain the specificity of the E site for deacylated tRNAs, as it is too small to accommodate any relevant aminoacyl-tRNA. The orientation of the minihelix suggests that it may mimic the P/E hybrid state. It appears that the E site on the 50S subunit was formed by only RNA in the last common ancestor of the three kingdoms, since the proteins at the E sites of H. marismortui and Deinucoccus radiodurans large subunits are not homologous.

PubMed: 14561884
DOI: 10.1261/rna.5120503

実験手法

X-RAY DIFFRACTION (3.1 Å)