1IRX image
Deposition Date 2001-10-25
Release Date 2002-04-17
Last Version Date 2023-12-27
Entry Detail
PDB ID:
1IRX
Keywords:
LIGASE
Title:
Crystal structure of class I lysyl-tRNA synthetase
Biological Source:
Source Organism:
Pyrococcus horikoshii (Taxon ID: 53953)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.60 Å
R-Value Free:
0.29
R-Value Work:
0.22
Space Group:
P 1 21 1
1IRX validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:lysyl-tRNA synthetase
Gene (Uniprot):lysS
Chain IDs:A, B
Chain Length:523
Number of Molecules:2
Biological Source:Pyrococcus horikoshii
UniProt ID:O57963 Pfam ID:PF01921, PF19269 EC:6.1.1.6
Ligand Molecules
ZN
Primary Citation
Functional convergence of two lysyl-tRNA synthetases with unrelated topologies.
Nat.Struct.Biol. 9 257 262 (2002)
PMID: 11887185 DOI: 10.1038/nsb777

Abstact

Lysyl-tRNA can be synthesized by both a class I (LysRS-I) and a class II (LysRS-II) lysyl-tRNA synthetase. The crystal structure of LysRS-I from Pyrococcus horikoshii at 2.6 A resolution reveals extensive similarity with glutamyl-tRNA synthetase (GluRS). A comparison of the structures of LysRS-I and LysRS-II in complex with lysine shows that both enzymes use similar strategies for substrate recognition within unrelated active site topologies. A docking model based upon the GluRS-tRNA complex suggests how LysRS-I and LysRS-II can recognize the same molecular determinants in tRNALys, as shown by biochemical results, while approaching the acceptor helix of the tRNA from opposite sides.

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Primary Citation of related structures
1IRX