4CTK

DENGUE 3 NS5 METHYLTRANSFERASE BOUND TO S-ADENOSYL METHIONINE AND FRAGMENT 2A4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Assessment of Dengue Virus Helicase and Methyltransferase as Targets for Fragment-Based Drug Discovery.

Coutard, B.Decroly, E.Li, C.Sharff, A.Lescar, J.Bricogne, G.Barral, K.

(2014) Antiviral Res. 106: 61

  • DOI: 10.1016/j.antiviral.2014.03.013
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Seasonal and pandemic flaviviruses continue to be leading global health concerns. With the view to help drug discovery against Dengue virus (DENV), a fragment-based experimental approach was applied to identify small molecule ligands targeting two ma ...

    Seasonal and pandemic flaviviruses continue to be leading global health concerns. With the view to help drug discovery against Dengue virus (DENV), a fragment-based experimental approach was applied to identify small molecule ligands targeting two main components of the flavivirus replication complex: the NS3 helicase (Hel) and the NS5 mRNA methyltransferase (MTase) domains. A library of 500 drug-like fragments was first screened by thermal-shift assay (TSA) leading to the identification of 36 and 32 fragment hits binding Hel and MTase from DENV, respectively. In a second stage, we set up a fragment-based X-ray crystallographic screening (FBS-X) in order to provide both validated fragment hits and structural binding information. No fragment hit was confirmed for DENV Hel. In contrast, a total of seven fragments were identified as DENV MTase binders and structures of MTase-fragment hit complexes were solved at resolution at least 2.0Å or better. All fragment hits identified contain either a five- or six-membered aromatic ring or both, and three novel binding sites were located on the MTase. To further characterize the fragment hits identified by TSA and FBS-X, we performed enzymatic assays to assess their inhibition effect on the N7- and 2'-O-MTase enzymatic activities: five of these fragment hits inhibit at least one of the two activities with IC50 ranging from 180μM to 9mM. This work validates the FBS-X strategy for identifying new anti-flaviviral hits targeting MTase, while Hel might not be an amenable target for fragment-based drug discovery (FBDD). This approach proved to be a fast and efficient screening method for FBDD target validation and discovery of starting hits for the development of higher affinity molecules that bind to novel allosteric sites.


    Organizational Affiliation

    Aix-Marseille Université, AFMB UMR 7257, 163 Avenue de Luminy, Case 932, 13288 Marseille Cedex 09, France; CNRS, AFMB UMR 7257, 163 Avenue de Luminy, Case 932, 13288 Marseille Cedex 09, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POLYPROTEIN
A, C
276Dengue virus 3Mutation(s): 0 
Find proteins for A9LIE0 (Dengue virus 3)
Go to UniProtKB:  A9LIE0
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
DMS
Query on DMS

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Download CCD File 
A
DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
SVN
Query on SVN

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Download CCD File 
A
thieno[2,3-b]pyrazin-7-amine
C6 H5 N3 S
ZRVKSPNBHZCQKY-UHFFFAOYSA-N
 Ligand Interaction
SAM
Query on SAM

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Download CCD File 
A, C
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 61.260α = 90.00
b = 185.100β = 90.00
c = 52.020γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
SCALAdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2014-05-28
    Type: Database references
  • Version 1.2: 2017-03-29
    Type: Other