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Entry Detail
PDB ID:
1WW1
Keywords:
HYDROLASE
Title:
Crystal structure of tRNase Z from Thermotoga maritima
Biological Source:
Source Organism:
Thermotoga maritima
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2004-12-30
Release Date:
2005-02-22
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.60 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 2
1WW1 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:tRNase Z
Chain IDs:A, B
Chain Length:280
Number of Molecules:2
Biological Source:Thermotoga maritima
UniProt ID:Q9WZW8 Pfam ID:PF12706
Ligand Molecules
ZN
Primary Citation
Crystal Structure of the tRNA 3' Processing Endoribonuclease tRNase Z from Thermotoga maritima
J.Biol.Chem. 280 14138 14144 (2005)
PMID: 15701599 DOI: 10.1074/jbc.M500355200

Abstact

The maturation of the tRNA 3' end is catalyzed by a tRNA 3' processing endoribonuclease named tRNase Z (RNase Z or 3'-tRNase) in eukaryotes, Archaea, and some bacteria. The tRNase Z generally cuts the 3' extra sequence from the precursor tRNA after the discriminator nucleotide. In contrast, Thermotoga maritima tRNase Z cleaves the precursor tRNA precisely after the CCA sequence. In this study, we determined the crystal structure of T. maritima tRNase Z at 2.6-A resolution. The tRNase Z has a four-layer alphabeta/betaalpha sandwich fold, which is classified as a metallo-beta-lactamase fold, and forms a dimer. The active site is located at one edge of the beta-sandwich and is composed of conserved motifs. Based on the structure, we constructed a docking model with the tRNAs that suggests how tRNase Z may recognize the substrate tRNAs.

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