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Crystal Structure of Leucyl-tRNA Synthetase from the Archaeon Pyrococcus horikoshii Reveals a Novel Editing Domain Orientation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.180 

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Literature

Crystal Structure of Leucyl-tRNA Synthetase from the Archaeon Pyrococcus horikoshii Reveals a Novel Editing Domain Orientation

Fukunaga, R.Yokoyama, S.

(2005) J.Mol.Biol. 346: 57-71

  • DOI: 10.1016/j.jmb.2004.11.060

  • PubMed Abstract: 
  • The editing domains of the closely homologous leucyl, isoleucyl, and valyl-tRNA synthetases (LeuRS, IleRS, and ValRS, respectively) contribute to accurate aminoacylation, by hydrolyzing misformed non-cognate aminoacyl-tRNAs. The editing domain is ins ...

    The editing domains of the closely homologous leucyl, isoleucyl, and valyl-tRNA synthetases (LeuRS, IleRS, and ValRS, respectively) contribute to accurate aminoacylation, by hydrolyzing misformed non-cognate aminoacyl-tRNAs. The editing domain is inserted at the same point of the sequence in IleRS, ValRS, and the archaeal/eukaryal LeuRS, but at a distinct point in the bacterial LeuRS. Here, we showed that LeuRS from the archaeon Pyrococcus horikoshii has editing activity against the nearly cognate isoleucine. The conserved Asp332 in the editing domain is crucial for this activity. A deletion mutant lacking the C-terminal region has only negligible aminoacylation activity, but retains the full activity of adenylate synthesis and editing. We determined the crystal structure of this editing-active, truncated form of P.horikoshii LeuRS at 2.1 A resolution. The structure revealed that it has a novel editing domain orientation. The editing domain of P.horikoshii LeuRS is rotated by approximately 180 degrees (rotational state II), with the two-beta-stranded linker untwisted by a half-turn, as compared to those in IleRS and ValRS (rotational state I). This editing domain rotational state in the archaeal LeuRS is similar to that in the bacterial LeuRS. However, because of the insertion point difference, the orientation of the editing domain relative to the enzyme core in the archaeal LeuRS differs completely from that in the bacterial LeuRS. An insertion region specific to the archaeal/eukaryal LeuRS editing domains interacts with the enzyme core and stabilizes the unique orientation. Thus, we established that there are three types of editing domain orientations relative to the enzyme core, depending on the combination of the editing domain insertion point (i or ii) and the rotational state (I or II): [i, I] for IleRS and ValRS, [ii, II] for the bacterial LeuRS, and now [i, II] for the archaeal/eukaryal LeuRS.


    Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Leucyl-tRNA synthetase
A
810Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)Mutation(s): 0 
Gene Names: leuS
EC: 6.1.1.4
Find proteins for O58698 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Go to UniProtKB:  O58698
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.180 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 186.196α = 90.00
b = 186.196β = 90.00
c = 91.428γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSrefinement
SCALEPACKdata scaling
MLPHAREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-02-08
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance