1MI6

Docking of the modified RF2 X-ray structure into the Low Resolution Cryo-EM map of RF2 E.coli 70S Ribosome

1MI6 の概要

• エントリーDOI: 10.2210/pdb1mi6/pdb
• 関連するPDBエントリー: 1DT9 1GQE
• EMDBエントリー: 1006 1007 1008 1009 1010
• 分子名称: peptide chain release factor RF-2 (1 entity in total)
• 機能のキーワード: rf2, release complex, conformational changes, translation, ribosome
• 由来する生物種: Escherichia coli
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 41256.61

構造登録者

Rawat, U.B.S.,Zavialov, A.V.,Sengupta, J.,Valle, M.,Grassucci, R.A.,Linde, J.,Vestergaard, B.,Ehrenberg, M.,Frank, J. (登録日: 2002-08-22, 公開日: 2003-01-14, 最終更新日: 2024-02-14)

主引用文献

Rawat, U.B.S.,Zavialov, A.V.,Sengupta, J.,Valle, M.,Grassucci, R.A.,Linde, J.,Vestergaard, B.,Ehrenberg, M.,Frank, J.
A cryo-electron microscopic study of ribosome-bound termination factor RF2
Nature, 421:87-90, 2003

PubMed Abstract: Protein synthesis takes place on the ribosome, where genetic information carried by messenger RNA is translated into a sequence of amino acids. This process is terminated when a stop codon moves into the ribosomal decoding centre (DC) and is recognized by a class-1 release factor (RF). RFs have a conserved GGQ amino-acid motif, which is crucial for peptide release and is believed to interact directly with the peptidyl-transferase centre (PTC) of the 50S ribosomal subunit. Another conserved motif of RFs (SPF in RF2) has been proposed to interact directly with stop codons in the DC of the 30S subunit. The distance between the DC and PTC is approximately 73 A. However, in the X-ray structure of RF2, SPF and GGQ are only 23 A apart, indicating that they cannot be at DC and PTC simultaneously. Here we show that RF2 is in an open conformation when bound to the ribosome, allowing GGQ to reach the PTC while still allowing SPF-stop-codon interaction. The results indicate new interpretations of accuracy in termination, and have implications for how the presence of a stop codon in the DC is signalled to PTC.

PubMed: 12511960
DOI: 10.1038/nature01224

実験手法

ELECTRON MICROSCOPY (12.8 Å)