2H8I

Crystal Structure of the Bothropstoxin-I complexed with polyethylene glycol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Interfacial surface charge and free accessibility to the PLA2-active site-like region are essential requirements for the activity of Lys49 PLA2 homologues

Murakami, M.T.Vicotia, M.M.Abrego, J.R.B.Lourenzoni, M.R.Cintra, A.C.O.Arruda, E.Z.Tomaz, M.A.Melo, P.A.Arni, R.K.

(2007) Toxicon 49: 378-387

  • DOI: 10.1016/j.toxicon.2006.10.011
  • Primary Citation of Related Structures:  
    2H8I

  • PubMed Abstract: 
  • Lys49 phospholipase A2 homologues are highly myotoxic and cause extensive tissue damage but do not display hydrolytic activity towards natural phospholipids. The binding of heparin, heparin derivatives and polyanionic compounds such as suramin result ...

    Lys49 phospholipase A2 homologues are highly myotoxic and cause extensive tissue damage but do not display hydrolytic activity towards natural phospholipids. The binding of heparin, heparin derivatives and polyanionic compounds such as suramin result in partial inhibition (up to 60%) of the myotoxic effects due to a change in the overall charge of the interfacial surface. In vivo experiments demonstrate that polyethylene glycol inhibits more than 90% of the myotoxic effects without exhibiting secondary toxic effects. The crystal structure of bothropstoxin-I complexed with polyethylene glycol reveals that this inhibition is due to steric hindrance of the access to the PLA2-active site-like region. These two inhibitory pathways indicate the roles of the overall surface charge and free accessibility to the PLA2-active site-like region in the functioning of Lys49 phospholipases A2 homologues. Molecular dynamics simulations, small angle X-ray scattering and structural analysis indicate that the oligomeric states both in solution and in the crystalline states of Lys49 phospholipases A2 are principally mediated by hydrophobic contacts formed between the interfacial surfaces. These results provide the framework for the potential application of both clinically approved drugs for the treatment of Viperidae snakebites.


    Organizational Affiliation

    Department of Physics, IBILCE/UNESP, Cristovão Colombo 2265, São José do Rio Preto, SP 15054-000, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phospholipase A2 homolog 1AB121Bothrops jararacussuMutation(s): 0 
Find proteins for Q90249 (Bothrops jararacussu)
Explore Q90249 
Go to UniProtKB:  Q90249
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download CCD File 
A, B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.228 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.019α = 90
b = 56.019β = 90
c = 127.568γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
DENZOdata reduction
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-19
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description