6PWH

Cystal structure of Myotoxin II from Bothrops moojeni co-crystallized with Varespladib (LY315920)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 

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Literature

Structural basis for phospholipase A2-like toxin inhibition by the synthetic compound Varespladib (LY315920).

Salvador, G.H.M.Gomes, A.A.S.Bryan-Quiros, W.Fernandez, J.Lewin, M.R.Gutierrez, J.M.Lomonte, B.Fontes, M.R.M.

(2019) Sci Rep 9: 17203-17203

  • DOI: 10.1038/s41598-019-53755-5
  • Primary Citation of Related Structures:  
    6PWH

  • PubMed Abstract: 
  • The World Health Organization recently listed snakebite envenoming as a Neglected Tropical Disease, proposing strategies to significantly reduce the global burden of this complex pathology by 2030. In this context, effective adjuvant treatments to complement conventional antivenom therapy based on inhibitory molecules for specific venom toxins have gained renewed interest ...

    The World Health Organization recently listed snakebite envenoming as a Neglected Tropical Disease, proposing strategies to significantly reduce the global burden of this complex pathology by 2030. In this context, effective adjuvant treatments to complement conventional antivenom therapy based on inhibitory molecules for specific venom toxins have gained renewed interest. Varespladib (LY315920) is a synthetic molecule clinically tested to block inflammatory cascades of several diseases associated with elevated levels of secreted phospholipase A 2 (sPLA 2 ). Most recently, Varespladib was tested against several whole snake venoms and isolated PLA 2 toxins, demonstrating potent inhibitory activity. Herein, we describe the first structural and functional study of the complex between Varespladib and a PLA 2 -like snake venom toxin (MjTX-II). In vitro and in vivo experiments showed this compound's capacity to inhibit the cytotoxic and myotoxic effects of MjTX-II from the medically important South American snake, Bothrops moojeni. Crystallographic and bioinformatics analyses revealed interactions of Varespladib with two specific regions of the toxin, suggesting inhibition occurs by physical blockage of its allosteric activation, preventing the alignment of its functional sites and, consequently, impairing its ability to disrupt membranes. Furthermore, based on the analysis of several crystallographic structures, a distinction between toxin activators and inhibitors is proposed.


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil. marcos.fontes@unesp.br.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Basic phospholipase A2 homolog 2A, B122Bothrops moojeniMutation(s): 0 
UniProt
Find proteins for Q9I834 (Bothrops moojeni)
Explore Q9I834 
Go to UniProtKB:  Q9I834
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
VRD (Subject of Investigation/LOI)
Query on VRD

Download Ideal Coordinates CCD File 
C [auth A], F [auth B]({3-[amino(oxo)acetyl]-1-benzyl-2-ethyl-1H-indol-4-yl}oxy)acetic acid
C21 H20 N2 O5
BHLXTPHDSZUFHR-UHFFFAOYSA-N
 Ligand Interaction
DMS
Query on DMS

Download Ideal Coordinates CCD File 
D [auth A], E [auth A]DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.864α = 90
b = 37.189β = 114.39
c = 68.681γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Sao Paulo Research Foundation (FAPESP)Brazil2015/24167-7

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2021-03-17
    Changes: Structure summary