4ARC

Ternary complex of E. coli leucyl-tRNA synthetase, tRNA(leu) and leucine in the editing conformation

4ARC の概要

• エントリーDOI: 10.2210/pdb4arc/pdb
• 関連するPDBエントリー: 2AJG 2AJH 2AJI 4AQ7
• 分子名称: LEUCINE--TRNA LIGASE, TRNA-LEU5 (UAA ISOACCEPTOR), LEUCINE, ... (5 entities in total)
• 機能のキーワード: ligase-rna complex, nucleotide-binding, protein biosynthesis, class i aminoacyl-trna synthetase, atp-binding, metal-binding, ligase/rna
• 由来する生物種: ESCHERICHIA COLI; 詳細
• 細胞内の位置: Cytoplasm: P07813
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 127724.15

構造登録者

Palencia, A.,Crepin, T.,Vu, M.T.,Lincecum Jr, T.L.,Martinis, S.A.,Cusack, S. (登録日: 2012-04-23, 公開日: 2012-06-13, 最終更新日: 2023-12-20)

主引用文献

Palencia, A.,Crepin, T.,Vu, M.T.,Lincecum Jr, T.L.,Martinis, S.A.,Cusack, S.
Structural Dynamics of the Aminoacylation and Proofreading Functional Cycle of Bacterial Leucyl-tRNA Synthetase
Nat.Struct.Mol.Biol., 19:677-, 2012

PubMed Abstract: Leucyl-tRNA synthetase (LeuRS) produces error-free leucyl-tRNA(Leu) by coordinating translocation of the 3' end of (mis-)charged tRNAs from its synthetic site to a separate proofreading site for editing. Here we report cocrystal structures of the Escherichia coli LeuRS-tRNA(Leu) complex in the aminoacylation or editing conformations, showing that translocation involves correlated rotations of four flexibly linked LeuRS domains. This pivots the tRNA to guide its charged 3' end from the closed aminoacylation state to the editing site. The editing domain unexpectedly stabilizes the tRNA during aminoacylation, and a large rotation of the leucine-specific domain positions the conserved KMSKS loop to bind the 3' end of the tRNA, promoting catalysis. Our results give new insight into the structural dynamics of a molecular machine that is essential for accurate protein synthesis.

PubMed: 22683997
DOI: 10.1038/NSMB.2317

実験手法

X-RAY DIFFRACTION (2 Å)