2DU7

Crystal structure of Methanococcus jannacshii O-phosphoseryl-tRNA synthetase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.387 
  • R-Value Work: 0.330 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural insights into the first step of RNA-dependent cysteine biosynthesis in archaea.

Fukunaga, R.Yokoyama, S.

(2007) Nat.Struct.Mol.Biol. 14: 272-279

  • DOI: 10.1038/nsmb1219
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cysteine is ligated to tRNA(Cys) by cysteinyl-tRNA synthetase in most organisms. However, in methanogenic archaea lacking cysteinyl-tRNA synthetase, O-phosphoserine is ligated to tRNA(Cys) by O-phosphoseryl-tRNA synthetase (SepRS), and the phosphoser ...

    Cysteine is ligated to tRNA(Cys) by cysteinyl-tRNA synthetase in most organisms. However, in methanogenic archaea lacking cysteinyl-tRNA synthetase, O-phosphoserine is ligated to tRNA(Cys) by O-phosphoseryl-tRNA synthetase (SepRS), and the phosphoseryl-tRNA(Cys) is converted to cysteinyl-tRNA(Cys). In this study, we determined the crystal structure of the SepRS tetramer in complex with tRNA(Cys) and O-phosphoserine at 2.6-A resolution. The catalytic domain of SepRS recognizes the negatively charged side chain of O-phosphoserine at a noncanonical site, using the dipole moment of a conserved alpha-helix. The unique C-terminal domain specifically recognizes the anticodon GCA of tRNA(Cys). On the basis of the structure, we engineered SepRS to recognize tRNA(Cys) mutants with the anticodons UCA and CUA and clarified the anticodon recognition mechanism by crystallography. The mutant SepRS-tRNA pairs may be useful for translational incorporation of O-phosphoserine into proteins in response to the stop codons UGA and UAG.


    Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
O-phosphoseryl-tRNA synthetase
A, B, C, D
549Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)Mutation(s): 0 
Gene Names: sepS
EC: 6.1.1.27
Find proteins for Q59054 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q59054
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.387 
  • R-Value Work: 0.330 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 196.354α = 90.00
b = 299.455β = 90.00
c = 125.877γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MOLREPphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-03-13
    Type: Initial release
  • Version 1.1: 2007-10-04
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance