1GSG

Structure of E.coli glutaminyl-tRNA synthetase complexed with trnagln and ATP at 2.8 Angstroms resolution

PDB DOI: https://doi.org/10.2210/pdb1GSG/pdb
NAKB: 1GSG

Classification: LIGASE/RNA
Organism(s): Escherichia coli
Mutation(s): No

Deposited: 1990-04-03 Released: 1992-02-24
Deposition Author(s): Rould, M.A., Perona, J.J., Soell, D., Steitz, T.A.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.80 Å
R-Value Work: 0.279
R-Value Observed: 0.279

wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history.

Literature

Structure of E. coli glutaminyl-tRNA synthetase complexed with tRNA(Gln) and ATP at 2.8 A resolution.

Rould, M.A., Perona, J.J., Soll, D., Steitz, T.A.

(1989) Science 246: 1135-1142

PubMed: 2479982 Search on PubMed
DOI: https://doi.org/10.1126/science.2479982
Primary Citation of Related Structures:
1GSG

PubMed Abstract:

The crystal structure of Escherichia coli glutaminyl-tRNA synthetase (GlnRS) complexed with its cognate glutaminyl transfer RNA (tRNA(Gln] and adenosine triphosphate (ATP) has been derived from a 2.8 angstrom resolution electron density map and the known protein and tRNA sequences. The 63.4-kilodalton monomeric enzyme consists of four domains arranged to give an elongated molecule with an axial ratio greater than 3 to 1. Its interactions with the tRNA extend from the anticodon to the acceptor stem along the entire inside of the L of the tRNA. The complexed tRNA retains the overall conformation of the yeast phenylalanine tRNA (tRNA(Phe] with two major differences: the 3' acceptor strand of tRNA(Gln) makes a hairpin turn toward the inside of the L, with the disruption of the final base pair of the acceptor stem, and the anticodon loop adopts a conformation not seen in any of the previously determined tRNA structures. Specific recognition elements identified so far include (i) enzyme contacts with the 2-amino groups of guanine via the tRNA minor groove in the acceptor stem at G2 and G3; (ii) interactions between the enzyme and the anticodon nucleotides; and (iii) the ability of the nucleotides G73 and U1.A72 of the cognate tRNA to assume a conformation stabilized by the protein at a lower free energy cost than noncognate sequences. The central domain of this synthetase binds ATP, glutamine, and the acceptor end of the tRNA as well as making specific interactions with the acceptor stem.2+t is

Related Citations:

Structural Basis for Misaminoacylation by Mutant E. Coli Glutaminyl-tRNA Synthetase Enzymes
Perona, J.J., Swanson, R.N., Rould, M.A., Steitz, T.A., Soell, D.
(1989) Science 246: 1152

Overproduction and Purification of Escherichia Coli tRNA(2Gln) and its Use in Crystallization of the Glutaminyl-tRNA Synthetase-tRNA(Gln) Complex
Perona, J.J., Swanson, R., Steitz, T.A., Soell, D.
(1988) J Mol Biol 202: 121

Organizational Affiliation:

Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.

Macromolecule Content

Total Structure Weight: 87.57 kDa
Atom Count: 601
Modelled Residue Count: 601
Deposited Residue Count: 628
Unique protein chains: 1
Unique nucleic acid chains: 1

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
GLUTAMINYL-TRNA SYNTHETASE	B [auth P]	553	Escherichia coli	Mutation(s): 0 EC: 6.1.1.18
UniProt
Find proteins for P00962 (Escherichia coli (strain K12)) Explore P00962 Go to UniProtKB: P00962
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P00962
Protein Feature View Expand
Reference Sequence