1CLP

CRYSTAL STRUCTURE OF A CALCIUM-INDEPENDENT PHOSPHOLIPASELIKE MYOTOXIC PROTEIN FROM BOTHROPS ASPER VENOM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of a calcium-independent phospholipase-like myotoxic protein from Bothrops asper venom.

Arni, R.K.Ward, R.J.Gutierrez, J.M.Tulinsky, A.

(1995) Acta Crystallogr D Biol Crystallogr 51: 311-317

  • DOI: 10.1107/S0907444994011455
  • Primary Citation of Related Structures:  
    1CLP

  • PubMed Abstract: 
  • Myotoxin II, a myotoxic calcium-independent phospholipase-like protein isolated from the venom of Bothrops asper, possesses no detectable phospholipase activity. The crystal structure has been determined and refined at 2.8 A to an R-factor of 16.5% ( ...

    Myotoxin II, a myotoxic calcium-independent phospholipase-like protein isolated from the venom of Bothrops asper, possesses no detectable phospholipase activity. The crystal structure has been determined and refined at 2.8 A to an R-factor of 16.5% (F > 3sigma) with excellent stereochemistry. Amino-acid differences between catalytically active phospholipases and myotoxin II in the Ca(2+)-binding region, specifically the substitutions Tyr28-->Asn, Gly32-->Leu and Asp49-->Lys, result in an altered local conformation. The key difference is that the epsilon-amino group of Lys49 fills the site normally occupied by the calcium ion in catalytically active phospholipases. In contrast to the homologous monomeric Lys49 variant from Agkistrodon piscivorus piscivorus, myotoxin II is present as a dimer both in solution and in the crystalline state. The two molecules in the asymmetric unit are related by a nearly perfect twofold axis, yet the dimer is radically different from the dimer formed by the phospholipase from Crotalus atrox. Whereas in C. atrox the dimer interface occludes the active sites, in myotoxin II they are exposed to solvent.


    Related Citations: 
    • Crystallization and Preliminary Diffraction Data of Two Myotoxins Isolated from the Venoms of Bothrops Asper (Terciopelo) and Bothrops Nummifer (Jumping Viper)
      Arni, R.K., Gutierrez, J.M.
      (1993) Toxicon 31: 1061

    Organizational Affiliation

    Department of Physics, UNEXSP-IBILCE, São José do Rio Preto-SP, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MYOTOXIN IIAB121Bothrops asperMutation(s): 0 
EC: 3.1.1.4
Find proteins for P24605 (Bothrops asper)
Explore P24605 
Go to UniProtKB:  P24605
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.18α = 90
b = 67.76β = 90
c = 88γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-11-30
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance