1WLE image
Deposition Date 2004-06-25
Release Date 2005-09-06
Last Version Date 2023-10-25
Entry Detail
PDB ID:
1WLE
Keywords:
Title:
Crystal Structure of mammalian mitochondrial seryl-tRNA synthetase complexed with seryl-adenylate
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.65 Å
R-Value Free:
0.22
R-Value Work:
0.21
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Seryl-tRNA synthetase
Gene (Uniprot):SARS2
Chain IDs:A, B
Chain Length:501
Number of Molecules:2
Biological Source:Bos taurus
Ligand Molecules
Primary Citation
Dual-mode recognition of noncanonical tRNAs(Ser) by seryl-tRNA synthetase in mammalian mitochondria
Embo J. 24 3369 3379 (2005)
PMID: 16163389 DOI: 10.1038/sj.emboj.7600811

Abstact

The secondary structures of metazoan mitochondrial (mt) tRNAs(Ser) deviate markedly from the paradigm of the canonical cloverleaf structure; particularly, tRNA(Ser)(GCU) corresponding to the AGY codon (Y=U and C) is highly truncated and intrinsically missing the entire dihydrouridine arm. None of the mt serine isoacceptors possesses the elongated variable arm, which is the universal landmark for recognition by seryl-tRNA synthetase (SerRS). Here, we report the crystal structure of mammalian mt SerRS from Bos taurus in complex with seryl adenylate at an atomic resolution of 1.65 A. Coupling structural information with a tRNA-docking model and the mutagenesis studies, we have unraveled the key elements that establish tRNA binding specificity, differ from all other known bacterial and eukaryotic systems, are the characteristic extensions in both extremities, as well as a few basic residues residing in the amino-terminal helical arm of mt SerRS. Our data further uncover an unprecedented mechanism of a dual-mode recognition employed to discriminate two distinct 'bizarre' mt tRNAs(Ser) by alternative combination of interaction sites.

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Primary Citation of related structures