3HZD

Crystal structure of bothropstoxin-I (BthTX-I), a PLA2 homologue from Bothrops jararacussu venom


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Comparison between apo and complexed structures of bothropstoxin-I reveals the role of Lys122 and Ca(2+)-binding loop region for the catalytically inactive Lys49-PLA(2)s.

Fernandes, C.A.Marchi-Salvador, D.P.Salvador, G.M.Silva, M.C.Costa, T.R.Soares, A.M.Fontes, M.R.

(2010) J.Struct.Biol. 171: 31-43

  • DOI: 10.1016/j.jsb.2010.03.019
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phospholipases A(2) (Asp49-PLA(2)s) are enzymes responsible for cellular membrane disruption through Ca(2+)-dependent hydrolysis of phospholipids. A class of these proteins (Lys49-PLA(2)s) does not show catalytic activity but can exert a pronounced l ...

    Phospholipases A(2) (Asp49-PLA(2)s) are enzymes responsible for cellular membrane disruption through Ca(2+)-dependent hydrolysis of phospholipids. A class of these proteins (Lys49-PLA(2)s) does not show catalytic activity but can exert a pronounced local myotoxic effect that is not neutralized by serum therapy. In this work, we present five structures of Lys49-PLA(2)s from snakes of the Bothrops genus in apo form, complexed with PEG molecules and chemically modified by p-bromofenacil bromide (BPB), a classic inhibitor of PLA(2). We present herein an extensive structural analysis including: (i) the function of hydrophobic long-chain molecules as Lys49-PLA(2)s inhibitors, (ii) the role of Lys122, previously indicated as being responsible for Lys49-PLA(2)s catalytic inactivity and, (iii) a structural comparison of the Ca(2+)-binding loop region between Lys49 and Asp49-PLA(2)s. The Lys122 analysis of 30 different monomers for apo and complexed Lys49-PLA(2)s structures shows that this residue is very flexible and may bind to different carboxyl groups giving stability to the crystal structures. The structural comparisons of the Ca(2+)-binding loop region between Lys49 and Asp49-PLA(2)s reveal the importance of the Tyr28 residue conservation in Asp49-PLA(2)s to the integrity of this loop. The Tyr28 residue stabilizes this region by an interaction with Gly35 residue. In Lys49-PLA(2)s and low-catalytic Asp49-PLA(2)s this interaction does not occur, preventing the binding of Ca(2+).


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, UNESP - Univ Estadual Paulista, Botucatu, SP, Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phospholipase A2 homolog bothropstoxin-1
A, B
121Bothrops jararacussuMutation(s): 0 
Find proteins for Q90249 (Bothrops jararacussu)
Go to UniProtKB:  Q90249
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LI
Query on LI

Download SDF File 
Download CCD File 
B
LITHIUM ION
Li
HBBGRARXTFLTSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 55.671α = 90.00
b = 55.671β = 90.00
c = 127.836γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-11-30
    Type: Database references
  • Version 1.3: 2012-02-22
    Type: Database references