4RRG

Editing domain of threonyl-tRNA synthetase from Methanococcus jannaschii with L-Thr3AA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Specificity and catalysis hardwired at the RNA-protein interface in a translational proofreading enzyme.

Ahmad, S.Muthukumar, S.Kuncha, S.K.Routh, S.B.Yerabham, A.S.Hussain, T.Kamarthapu, V.Kruparani, S.P.Sankaranarayanan, R.

(2015) Nat Commun 6: 7552-7552

  • DOI: 10.1038/ncomms8552
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Proofreading modules of aminoacyl-tRNA synthetases are responsible for enforcing a high fidelity during translation of the genetic code. They use strategically positioned side chains for specifically targeting incorrect aminoacyl-tRNAs. Here, we show ...

    Proofreading modules of aminoacyl-tRNA synthetases are responsible for enforcing a high fidelity during translation of the genetic code. They use strategically positioned side chains for specifically targeting incorrect aminoacyl-tRNAs. Here, we show that a unique proofreading module possessing a D-aminoacyl-tRNA deacylase fold does not use side chains for imparting specificity or for catalysis, the two hallmark activities of enzymes. We show, using three distinct archaea, that a side-chain-stripped recognition site is fully capable of solving a subtle discrimination problem. While biochemical probing establishes that RNA plays the catalytic role, mechanistic insights from multiple high-resolution snapshots reveal that differential remodelling of the catalytic core at the RNA-peptide interface provides the determinants for correct proofreading activity. The functional crosstalk between RNA and protein elucidated here suggests how primordial enzyme functions could have emerged on RNA-peptide scaffolds before recruitment of specific side chains.


    Organizational Affiliation

    Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Uppal Road, Hyderabad 500007, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Threonine--tRNA ligase
A, B, C, D
141Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)Mutation(s): 0 
Gene Names: thrS
EC: 6.1.1.3
Find proteins for Q58597 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q58597
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A3T
Query on A3T

Download SDF File 
Download CCD File 
A, B, C
3'-deoxy-3'-(L-threonylamino)adenosine
C14 H21 N7 O5
JYCQZCJEBNTMCV-JHJLZTHQSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
A3TKd: 3875900 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.196 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 36.569α = 90.00
b = 64.885β = 91.07
c = 97.752γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data reduction
PHASERphasing
REFMACrefinement
HKL-2000data scaling
AUTOMARdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-15
    Type: Initial release
  • Version 1.1: 2017-11-22
    Type: Advisory, Refinement description