6RLU

Trypanosoma brucei Seryl-tRNA Synthetase in Complex with 5'-O-(N-(L-seryl)-sulfamoyl)cytidine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insights into the Binding of Natural Pyrimidine-Based Inhibitors of Class II Aminoacyl-tRNA Synthetases.

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

(2020) Acs Chem.Biol. --: --

  • DOI: 10.1021/acschembio.9b00887
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pyrimidine-containing Trojan horse antibiotics albomycin and a recently discovered cytidine-containing microcin C analog target the class II seryl- and aspartyl-tRNA synthetases (serRS and aspRS), respectively. The active components of these comp ...

    The pyrimidine-containing Trojan horse antibiotics albomycin and a recently discovered cytidine-containing microcin C analog target the class II seryl- and aspartyl-tRNA synthetases (serRS and aspRS), respectively. The active components of these compounds are competitive inhibitors that mimic the aminoacyl-adenylate intermediate. How they effectively substitute for the interactions mediated by the canonical purine group is unknown. Employing nonhydrolyzable aminoacyl-sulfamoyl nucleosides substituting the base with cytosine, uracil, and N3-methyluracil the structure-activity relationship of the natural compounds was evaluated. In vitro using E. coli serRS and aspRS, the best compounds demonstrated IC 50 values in the low nanomolar range, with a clear preference for cytosine or N3-methyluracil over uracil. X-ray crystallographic structures of K. pneumoniae serRS and T. thermophilus aspRS in complex with the compounds showed the contribution of structured waters and residues in the conserved motif-2 loop in defining base preference. Utilizing the N3-methyluracil bound serRS structure, MD simulations of the fully modified albomycin base were performed to identify the interacting network that drives stable association. This analysis pointed to key interactions with a methionine in the motif-2 loop. Interestingly, this residue is mutated to a glycine in a second serRS (serRS2) found in albomycin-producing actinobacteria possessing self-immunity to this antibiotic. A comparative study demonstrated that serRS2 is poorly inhibited by the pyrimidine-containing intermediate analogs, and an equivalent mutation in E. coli serRS significantly decreased the affinity of the cytosine congener. These findings highlight the crucial role of dynamics and solvation of the motif-2 loop in modulating the binding of the natural antibiotics.


    Organizational Affiliation

    Medicinal Chemistry , Rega Institute for Medical Research , Herestraat 49 Box 1041 , B-3000 Leuven , Belgium.,Biocrystallography, Department of Pharmaceutical and Pharmacological Sciences , KU Leuven , Herestraat 49 Box 822 , B-3000 Leuven , Belgium.,Laboratory for Molecular Bacteriology, Department of Microbiology and Immunology , Rega Institute for Medical Research , Herestraat 49, Gasthuisberg Campus , B-3000 Leuven , Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Seryl-tRNA synthetase, putative
A, B
479Trypanosoma brucei gambiense (strain MHOM/CI/86/DAL972)Mutation(s): 0 
EC: 6.1.1.11
Find proteins for D0A7P1 (Trypanosoma brucei gambiense (strain MHOM/CI/86/DAL972))
Go to UniProtKB:  D0A7P1
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
MLI
Query on MLI

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Download CCD File 
B
MALONATE ION
C3 H2 O4
OFOBLEOULBTSOW-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FZQ
Query on FZQ

Download SDF File 
Download CCD File 
A, B
5'-O-(N-(L-seryl)-sulfamoyl)cytidine
C12 H19 N5 O9 S
KLHALWQAANSHJB-DANLAGSESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 178.357α = 90.00
b = 178.357β = 90.00
c = 246.688γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Research Foundation - FlandersBelgiumG077814N
Research Foundation - FlandersBelgiumG0A4616N
Research Foundation - FlandersBelgium1S53516N

Revision History 

  • Version 1.0: 2020-01-08
    Type: Initial release
  • Version 1.1: 2020-01-15
    Type: Database references