3P0J

Leishmania major Tyrosyl-tRNA synthetase in complex with tyrosinol, triclinic crystal form 1

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.246 

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This is version 1.2 of the entry. See complete history. 


Literature

The Double-Length Tyrosyl-tRNA Synthetase from the Eukaryote Leishmania major Forms an Intrinsically Asymmetric Pseudo-Dimer.

Larson, E.T., Kim, J.E., Castaneda, L.J., Napuli, A.J., Zhang, Z., Fan, E., Zucker, F.H., Verlinde, C.L., Buckner, F.S., Van Voorhis, W.C., Hol, W.G., Merritt, E.A.

(2011) J Mol Biol 409: 159-176

  • DOI: 10.1016/j.jmb.2011.03.026
  • Primary Citation of Related Structures:  
    3P0H, 3P0I, 3P0J

  • PubMed Abstract: 

    • The single tyrosyl-tRNA synthetase (TyrRS) gene in trypanosomatid genomes codes for a protein that is twice the length of TyrRS from virtually all other organisms. Each half of the double-length TyrRS contains a catalytic domain and an anticodon-binding domain; however, the two halves retain only 17% sequence identity to each other ...

    The single tyrosyl-tRNA synthetase (TyrRS) gene in trypanosomatid genomes codes for a protein that is twice the length of TyrRS from virtually all other organisms. Each half of the double-length TyrRS contains a catalytic domain and an anticodon-binding domain; however, the two halves retain only 17% sequence identity to each other. The structural and functional consequences of this duplication and divergence are unclear. TyrRS normally forms a homodimer in which the active site of one monomer pairs with the anticodon-binding domain from the other. However, crystal structures of Leishmania major TyrRS show that, instead, the two halves of a single molecule form a pseudo-dimer resembling the canonical TyrRS dimer. Curiously, the C-terminal copy of the catalytic domain has lost the catalytically important HIGH and KMSKS motifs characteristic of class I aminoacyl-tRNA synthetases. Thus, the pseudo-dimer contains only one functional active site (contributed by the N-terminal half) and only one functional anticodon recognition site (contributed by the C-terminal half). Despite biochemical evidence for negative cooperativity between the two active sites of the usual TyrRS homodimer, previous structures have captured a crystallographically-imposed symmetric state. As the L. major TyrRS pseudo-dimer is inherently asymmetric, conformational variations observed near the active site may be relevant to understanding how the state of a single active site is communicated across the dimer interface. Furthermore, substantial differences between trypanosomal TyrRS and human homologs are promising for the design of inhibitors that selectively target the parasite enzyme.

    Organizational Affiliation: 

    Medical Structural Genomics of Pathogenic Protozoa, Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosyl-tRNA synthetaseA, B, C, D690Leishmania majorMutation(s): 0 
Gene Names: LmjF14.1370, LMJF_14_1370
EC: 6.1.1.1
UniProt
Find proteins for Q4QFJ7 (Leishmania major)
Explore Q4QFJ7 
Go to UniProtKB:  Q4QFJ7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4QFJ7
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.246 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.519α = 74.47
b = 111.934β = 80.83
c = 141.043γ = 77.13
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description