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Nat Struct Mol Biol. 2005 Oct;12(10):923-30. Epub 2005 Sep 11.

The crystal structure of leucyl-tRNA synthetase complexed with tRNALeu in the post-transfer-editing conformation.

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European Molecular Biology Laboratory, Grenoble Outstation, c/o Institut Laue-Langevin, 156X, F-38042 Grenoble Cedex 9, France.


Leucyl-tRNA synthetase (LeuRS) has a specific post-transfer editing activity directed against mischarged isoleucine and similar noncognate amino acids. We describe the post-transfer-editing and product complexes of Thermus thermophilus LeuRS (LeuRSTT) with tRNA(Leu) at 2.9- to 3.3-A resolution. In the post-transfer-editing configuration, A76 binds in the editing active site exactly as previously found for the adenosine moiety of a small-molecule editing-substrate analog. The 60 C-terminal residues of LeuRSTT, unseen in previous structures, fold into a compact domain flexibly linked to the rest of the molecule and interacting with the G19-C56 tertiary base pair of tRNA(Leu). LeuRS recognition of tRNA(Leu) depends essentially on tRNA shape rather than base-specific interactions. The structures show that considerable domain rotations, notably of the editing domain, accompany the tRNA-3' end dynamics associated successively with aminoacylation, post-transfer editing and product release.

[Indexed for MEDLINE]

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