5VFM

Crystal structure of BnSP-7 from Bothrops pauloensis complexed with p-coumaric acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.058 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural studies with BnSP-7 reveal an atypical oligomeric conformation compared to phospholipases A2-like toxins.

de Lima, L.F.G.Borges, R.J.Viviescas, M.A.Fernandes, C.A.H.Fontes, M.R.M.

(2017) Biochimie 142: 11-21

  • DOI: 10.1016/j.biochi.2017.07.009
  • Primary Citation of Related Structures:  5VFH, 5VFJ, 5VFN

  • PubMed Abstract: 
  • There are 2.5 million cases of snakebite per year and approximately 100,000 to 150,000 deaths. Thus, it is considered an important public health problem by the World Health Organization. Snakes from the Bothrops genus may cause severe local effects i ...

    There are 2.5 million cases of snakebite per year and approximately 100,000 to 150,000 deaths. Thus, it is considered an important public health problem by the World Health Organization. Snakes from the Bothrops genus may cause severe local effects in the victims, so it is important to develop inhibitors to treat local effects in patients. In addition, approximately 30 different species of bothropic snakes have been described that may present differences in their venom composition. Small structural differences in the venom proteins may result in different ligands binding. Herein, BnSP-7, a PLA2-like protein that causes local myotoxic effects, was analyzed using different biophysical techniques. Crystal structures of BnSP-7 binding to three different cinnamic acid derivates were solved showing that the ligands bind in the membrane-dockage region (MDoS) of the protein. Spectroscopy fluorescence and microscale thermophoresis (MST) assays showed that these ligands also bind to BnSP-7 in solution and provide comparative information about their affinity to BnSP-7. MST experiments also showed that hydroxyl radicals of the ligands, involved in their binding with the MDoS region of BnSP-7, are essential to increase their affinity with the protein. As this region has been indicated as essential for the myotoxic mechanism, the ligands could potentially be used as inhibitors for BnSP-7. These results provide relevant insights to understand the PLA2-like proteins myotoxic mechanism and may eventually lead to design of new inhibitors for these toxins. Furthermore, a comparative structural analysis of BnSP-7 with other PLA2-like proteins showed that BnSP-7 has an atypical quaternary conformation, suggesting an intermediate state that is unlike other PLA2-like proteins. This information, combined with the absence or partial occupancy of molecules in their hydrophobic channel and the misaligned membrane-disruption region, led us to hypothesize that the protein is not able to fully exert its myotoxic activity like other PLA2-like proteins.


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Basic phospholipase A2 homolog BnSP-7
B, A
121Bothrops pauloensisN/A
Find proteins for Q9IAT9 (Bothrops pauloensis)
Go to UniProtKB:  Q9IAT9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
HC4
Query on HC4

Download SDF File 
Download CCD File 
A
4'-HYDROXYCINNAMIC ACID
PARA-COUMARIC ACID
C9 H8 O3
NGSWKAQJJWESNS-ZZXKWVIFSA-N
 Ligand Interaction
ME2
Query on ME2

Download SDF File 
Download CCD File 
A, B
1-ETHOXY-2-(2-METHOXYETHOXY)ETHANE
C7 H16 O3
CNJRPYFBORAQAU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.058 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.790α = 90.00
b = 58.039β = 96.04
c = 58.010γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
CNPqBrazil140501/2014-2

Revision History 

  • Version 1.0: 2017-12-20
    Type: Initial release
  • Version 1.1: 2018-01-03
    Type: Database references