2WFG

Structure of the Candida albicans cytosolic leucyl-tRNA synthetase editing domain bound to a benzoxaborole-AMP adduct


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.188 

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Literature

Crystal Structures of the Human and Fungal Cytosolic Leucyl-tRNA Synthetase Editing Domains: A Structural Basis for the Rational Design of Antifungal Benzoxaboroles.

Seiradake, E.Mao, W.Hernandez, V.Baker, S.J.Plattner, J.J.Alley, M.R.K.Cusack, S.

(2009) J Mol Biol 390: 196

  • DOI: 10.1016/j.jmb.2009.04.073
  • Primary Citation of Related Structures:  
    2WFD, 2WFE, 2WFG

  • PubMed Abstract: 
  • Leucyl-tRNA synthetase (LeuRS) specifically links leucine to the 3' end of tRNA(leu) isoacceptors. The overall accuracy of the two-step aminoacylation reaction is enhanced by an editing domain that hydrolyzes mischarged tRNAs, notably ile-tRNA(leu). We present crystal structures of the editing domain from two eukaryotic cytosolic LeuRS: human and fungal pathogen Candida albicans ...

    Leucyl-tRNA synthetase (LeuRS) specifically links leucine to the 3' end of tRNA(leu) isoacceptors. The overall accuracy of the two-step aminoacylation reaction is enhanced by an editing domain that hydrolyzes mischarged tRNAs, notably ile-tRNA(leu). We present crystal structures of the editing domain from two eukaryotic cytosolic LeuRS: human and fungal pathogen Candida albicans. In comparison with previous structures of the editing domain from bacterial and archeal kingdoms, these structures show that the LeuRS editing domain has a conserved structural core containing the active site for hydrolysis, with distinct bacterial, archeal, or eukaryotic specific peripheral insertions. It was recently shown that the benzoxaborole antifungal compound AN2690 (5-fluoro-1,3-dihydro-1-hydroxy-1,2-benzoxaborole) inhibits LeuRS by forming a covalent adduct with the 3' adenosine of tRNA(leu) at the editing site, thus locking the enzyme in an inactive conformation. To provide a structural basis for enhancing the specificity of these benzoxaborole antifungals, we determined the structure at 2.2 A resolution of the C. albicans editing domain in complex with a related compound, AN3018 (6-(ethylamino)-5-fluorobenzo[c][1,2]oxaborol-1(3H)-ol), using AMP as a surrogate for the 3' adenosine of tRNA(leu). The interactions between the AN3018-AMP adduct and C. albicans LeuRS are similar to those previously observed for bacterial LeuRS with the AN2690 adduct, with an additional hydrogen bond to the extra ethylamine group. However, compared to bacteria, eukaryotic cytosolic LeuRS editing domains contain an extra helix that closes over the active site, largely burying the adduct and providing additional direct and water-mediated contacts. Small differences between the human domain and the fungal domain could be exploited to enhance fungal specificity.


    Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble Outstation rue Jules Horowitz, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYTOSOLIC LEUCYL-TRNA SYNTHETASEA261Candida albicansMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZZB
Query on ZZB

Download Ideal Coordinates CCD File 
B [auth A][(1S,3S,5R,6R,8R)-6-(6-AMINOPURIN-9-YL)-4'-ETHYLAMINO-3'-FLUORO-SPIRO[2,4,7-TRIOXA-3-BORANUIDABICYCLO[3.3.0]OCTANE-3,7'-8-OXA-7-BORANUIDABICYCLO[4.3.0]NONA-1,3,5-TRIENE]-8-YL]METHYL DIHYDROGEN PHOSPHATE
C19 H22 B F N6 O8 P
KLENTOAZKNOXCI-JNRNKGNBSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
ZZB PDBBind:  2WFG IC50: 3.80e+4 (nM) from 1 assay(s)
Binding MOAD:  2WFG IC50: 3.80e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.02α = 90
b = 58.04β = 90
c = 97.55γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance