3HRI

Histidyl-tRNA synthetase (apo) from Trypanosoma brucei


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.272 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of trypanosomal histidyl-tRNA synthetase illuminate differences between eukaryotic and prokaryotic homologs.

Merritt, E.A.Arakaki, T.L.Gillespie, J.R.Larson, E.T.Kelley, A.Mueller, N.Napuli, A.J.Kim, J.Zhang, L.Verlinde, C.L.Fan, E.Zucker, F.Buckner, F.S.van Voorhis, W.C.Hol, W.G.

(2010) J.Mol.Biol. 397: 481-494

  • DOI: 10.1016/j.jmb.2010.01.051
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Crystal structures of histidyl-tRNA synthetase (HisRS) from the eukaryotic parasites Trypanosoma brucei and Trypanosoma cruzi provide a first structural view of a eukaryotic form of this enzyme and reveal differences from bacterial homologs. HisRSs i ...

    Crystal structures of histidyl-tRNA synthetase (HisRS) from the eukaryotic parasites Trypanosoma brucei and Trypanosoma cruzi provide a first structural view of a eukaryotic form of this enzyme and reveal differences from bacterial homologs. HisRSs in general contain an extra domain inserted between conserved motifs 2 and 3 of the Class II aminoacyl-tRNA synthetase catalytic core. The current structures show that the three-dimensional topology of this domain is very different in bacterial and archaeal/eukaryotic forms of the enzyme. Comparison of apo and histidine-bound trypanosomal structures indicates substantial active-site rearrangement upon histidine binding but relatively little subsequent rearrangement after reaction of histidine with ATP to form the enzyme's first reaction product, histidyladenylate. The specific residues involved in forming the binding pocket for the adenine moiety differ substantially both from the previously characterized binding site in bacterial structures and from the homologous residues in human HisRSs. The essentiality of the single HisRS gene in T. brucei is shown by a severe depression of parasite growth rate that results from even partial suppression of expression by RNA interference.


    Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, WA 98195, USA. merritt@u.washington.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histidyl-tRNA synthetase
A, B, C, D, E, F
456Trypanosoma brucei brucei (strain 927/4 GUTat10.1)Mutation(s): 0 
EC: 6.1.1.21
Find proteins for Q584V0 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Go to UniProtKB:  Q584V0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.272 
  • Space Group: I 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 148.610α = 90.00
b = 98.380β = 90.33
c = 251.969γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
MOSFLMdata reduction
Blu-Icedata collection
SCALAdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance