6Q89

Neisseria gonorrhoeae Leucyl-tRNA Synthetase in Complex with the Intermediate Analog 5'-O-(N-(L-Leucyl)-Sulfamoyl)Adenosine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Comparative analysis of pyrimidine substituted aminoacyl-sulfamoyl nucleosides as potential inhibitors targeting class I aminoacyl-tRNA synthetases.

Nautiyal, M.De Graef, S.Pang, L.Gadakh, B.Strelkov, S.V.Weeks, S.D.Van Aerschot, A.

(2019) Eur J Med Chem 173: 154-166

  • DOI: 10.1016/j.ejmech.2019.04.003
  • Primary Citation of Related Structures:  
    6HB5, 6HB7, 6HB6, 6I5Y, 6Q89, 6Q8B, 6Q8A, 6Q8C

  • PubMed Abstract: 
  • Aminoacyl-tRNA synthetases (aaRSs) catalyse the ATP-dependent coupling of an amino acid to its cognate tRNA. Being vital for protein translation aaRSs are considered a promising target for the development of novel antimicrobial agents. 5'-O-(N-aminoacyl)-sulfamoyl adenosine (aaSA) is a non-hydrolysable analogue of the aaRS reaction intermediate that has been shown to be a potent inhibitor of this enzyme family but is prone to chemical instability and enzymatic modification ...

    Aminoacyl-tRNA synthetases (aaRSs) catalyse the ATP-dependent coupling of an amino acid to its cognate tRNA. Being vital for protein translation aaRSs are considered a promising target for the development of novel antimicrobial agents. 5'-O-(N-aminoacyl)-sulfamoyl adenosine (aaSA) is a non-hydrolysable analogue of the aaRS reaction intermediate that has been shown to be a potent inhibitor of this enzyme family but is prone to chemical instability and enzymatic modification. In an attempt to improve the molecular properties of this scaffold we synthesized a series of base substituted aaSA analogues comprising cytosine, uracil and N 3 -methyluracil targeting leucyl-, tyrosyl- and isoleucyl-tRNA synthetases. In in vitro assays seven out of the nine inhibitors demonstrated K i app values in the low nanomolar range. To complement the biochemical studies, X-ray crystallographic structures of Neisseria gonorrhoeae leucyl-tRNA synthetase and Escherichia coli tyrosyl-tRNA synthetase in complex with the newly synthesized compounds were determined. These highlighted a subtle interplay between the base moiety and the target enzyme in defining relative inhibitory activity. Encouraged by this data we investigated if the pyrimidine congeners could escape a natural resistance mechanism, involving acetylation of the amine of the aminoacyl group by the bacterial N-acetyltransferases RimL and YhhY. With RimL the pyrimidine congeners were less susceptible to inactivation compared to the equivalent aaSA, whereas with YhhY the converse was true. Combined the various insights resulting from this study will pave the way for the further rational design of aaRS inhibitors.


    Organizational Affiliation

    Medicinal Chemistry, Rega Institute for Medical Research, KU Leuven, Herestraat 49 Box 1041, B-3000, Leuven, Belgium. Electronic address: arthur.vanaerschot@kuleuven.be.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Leucine--tRNA ligaseA877Neisseria gonorrhoeaeMutation(s): 1 
Gene Names: leuSWHOK_00006WHOM_00006WHOO_00006WHOP_00006WHOU_00006WHOW_00006WHOX_00006WHOY_00006WHOZ_00006
EC: 6.1.1.4
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LSS (Subject of Investigation/LOI)
Query on LSS

Download Ideal Coordinates CCD File 
B [auth A]5'-O-(L-leucylsulfamoyl)adenosine
C16 H25 N7 O7 S
XFEDFDTWJLGMBO-LEJQEAHTSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
D [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.942α = 90
b = 82.935β = 90
c = 228.519γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Research Foundation - FlandersBelgiumG077814N
Research Foundation - FlandersBelgiumG0A4616N
Research Foundation - FlandersBelgium1109117N

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-17
    Type: Initial release
  • Version 1.1: 2019-04-24
    Changes: Data collection, Database references
  • Version 1.2: 2019-05-01
    Changes: Data collection