This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
1g59
From Proteopedia
| |||||||
| , resolution 2.4Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , , | ||||||
| Activity: | Glutamate--tRNA ligase, with EC number 6.1.1.17 | ||||||
| Related: | 1GLN
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
GLUTAMYL-TRNA SYNTHETASE COMPLEXED WITH TRNA(GLU).
Overview
Glutamyl-tRNA synthetases (GluRSs) are divided into two distinct types, with regard to the presence or absence of glutaminyl-tRNA synthetase (GlnRS) in the genetic translation systems. In the original 19-synthetase systems lacking GlnRS, the 'non-discriminating' GluRS glutamylates both tRNAGlu and tRNAGln. In contrast, in the evolved 20-synthetase systems with GlnRS, the 'discriminating' GluRS aminoacylates only tRNAGlu. Here we report the 2.4 A resolution crystal structure of a 'discriminating' GluRS.tRNAGlu complex from Thermus thermophilus. The GluRS recognizes the tRNAGlu anticodon bases via two alpha-helical domains, maintaining the base stacking. We show that the discrimination between the Glu and Gln anticodons (34YUC36 and 34YUG36, respectively) is achieved by a single arginine residue (Arg 358). The mutation of Arg 358 to Gln resulted in a GluRS that does not discriminate between the Glu and Gln anticodons. This change mimics the reverse course of GluRS evolution from anticodon 'non-dicsriminating' to 'discriminating'.
About this Structure
1G59 is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.
Reference
Structural basis for anticodon recognition by discriminating glutamyl-tRNA synthetase., Sekine S, Nureki O, Shimada A, Vassylyev DG, Yokoyama S, Nat Struct Biol. 2001 Mar;8(3):203-6. PMID:11224561
Page seeded by OCA on Sun Mar 30 20:36:56 2008
Categories: Glutamate--tRNA ligase | Single protein | Thermus thermophilus | Nureki, O. | RSGI, RIKEN Structural Genomics/Proteomics Initiative. | Sekine, S. | Shimada, A. | Vassylyev, D G. | Yokoyama, S. | Aminoacyl-trna synthetase | Protein-rna complex | Riken structural genomics/proteomics initiative | Rsgi | Structural genomic | Transfer rna
