1FSC

Crystal Structure of Fasciculin 2 from Green Mamba Snake Venom: Evidence for Unusual Loop Flexibility


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.188 

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This is version 1.2 of the entry. See complete history

Literature

Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility.

le Du, M.H.Housset, D.Marchot, P.Bougis, P.E.Navaza, J.Fontecilla-Camps, J.C.

(1996) Acta Crystallogr.,Sect.D 52: 87-92

  • DOI: 10.1107/S0907444995007517

  • PubMed Abstract: 
  • The crystal structure of the snake toxin fasciculin 2, a potent acetylcholinesterase inhibitor from the venom of the green mamba (Dendroaspis angusticeps), has been determined by the molecular-replacement method, using the fasciculin 1 model and refi ...

    The crystal structure of the snake toxin fasciculin 2, a potent acetylcholinesterase inhibitor from the venom of the green mamba (Dendroaspis angusticeps), has been determined by the molecular-replacement method, using the fasciculin 1 model and refined to 2.0 A resolution. The introduction of an overall anisotropic temperature factor improved significantly the quality of the electron-density map. It suggests, as it was also indicated by the packing, that the thermal motion along the unique axis direction is less pronounced than on the (ab) plane. The final crystallographic R factor is 0.188 for a model having r.m.s. deviations from ideality of 0.016 A for bond lengths and 2.01 degrees for bond angles. As fasciculin 1, fasciculin 2 belongs to the three-finger class of Elapidae toxins, a structural group that also contains the alpha-neurotoxins and the cardiotoxins. Although the two fasciculins have, overall, closely related structures, the conformation of loop I differs appreciably in the two molecules. The presence of detergent in crystallization medium in the case of fasciculin 2 appears to be responsible for the displacement of the loop containing Thr9. This conformational change also results in the formation of a crystallographic dimer that displays extensive intermolecular interactions.


    Related Citations: 
    • 1.9-Angstroms Resolution Structure of Fasciculin 1, an Anti-Acetylcholinesterase Toxin from Green Mamba Snake Venom
      Le Du, M.H.,Marchot, P.,Bougis, P.E.,Fontecilla-Camps, J.C.
      (1992) J.Biol.Chem. 267: 22122
    • Crystals of Fasciculin 2 from Green Mamba Snake Venom
      Le, M.H.,Marchot, P.,Bougis, P.E.,Fontecilla-Camps, J.C.
      (1989) J.Biol.Chem. 264: 21401


    Organizational Affiliation

    Laboratoire de Cristallographie et Cristallogenèse des Protéines, Institut de Biologie Structurale J.P. Ebel, CEA-CNRS, Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FASCICULIN 2
A
61Dendroaspis angusticeps
Find proteins for P0C1Z0 (Dendroaspis angusticeps)
Go to UniProtKB:  P0C1Z0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.188 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 48.930α = 90.00
b = 48.930β = 90.00
c = 82.180γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-PLORrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-07-10
    Type: Initial release
  • Version 1.1: 2008-03-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance