1H3E image
Entry Detail
PDB ID:
1H3E
Keywords:
Title:
Tyrosyl-tRNA synthetase from Thermus thermophilus complexed with wild-type tRNAtyr(GUA) and with ATP and tyrosinol
Biological Source:
PDB Version:
Deposition Date:
2002-08-28
Release Date:
2002-10-27
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.26
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:TYROSYL-TRNA SYNTHETASE
Chain IDs:A
Chain Length:432
Number of Molecules:1
Biological Source:THERMUS THERMOPHILUS
Polymer Type:polyribonucleotide
Description:WILD-TYPE TRNATYR(GUA)
Chain IDs:B
Chain Length:86
Number of Molecules:1
Biological Source:THERMUS THERMOPHILUS
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
1MA B A ?
5MU B U 5-METHYLURIDINE 5'-MONOPHOSPHATE
PSU B U PSEUDOURIDINE-5'-MONOPHOSPHATE
Primary Citation
Class I Tyrosyl-tRNA Synthetase Has a Class II Mode or tRNA Recognition
Embo J. 21 3829 ? (2002)
PMID: 12110594 DOI: 10.1093/EMBOJ/CDF373

Abstact

Bacterial tyrosyl-tRNA synthetases (TyrRS) possess a flexibly linked C-terminal domain of approximately 80 residues, which has hitherto been disordered in crystal structures of the enzyme. We have determined the structure of Thermus thermophilus TyrRS at 2.0 A resolution in a crystal form in which the C-terminal domain is ordered, and confirm that the fold is similar to part of the C-terminal domain of ribosomal protein S4. We have also determined the structure at 2.9 A resolution of the complex of T.thermophilus TyrRS with cognate tRNA(tyr)(G Psi A). In this structure, the C-terminal domain binds between the characteristic long variable arm of the tRNA and the anti-codon stem, thus recognizing the unique shape of the tRNA. The anticodon bases have a novel conformation with A-36 stacked on G-34, and both G-34 and Psi-35 are base-specifically recognized. The tRNA binds across the two subunits of the dimeric enzyme and, remarkably, the mode of recognition of the class I TyrRS for its cognate tRNA resembles that of a class II synthetase in being from the major groove side of the acceptor stem.

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Primary Citation of related structures