1FSC

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.188 
  • R-Value Observed: 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 D Biol Crystallogr 52: 87-92

  • DOI: 10.1107/S0907444995007517
  • Primary Citation of Related Structures:  
    1FSC

  • 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 refined to 2 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FASCICULIN 2 A61Dendroaspis angusticepsMutation(s): 0 
Find proteins for P0C1Z0 (Dendroaspis angusticeps)
Explore P0C1Z0 
Go to UniProtKB:  P0C1Z0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UNL
Query on UNL

Download Ideal Coordinates CCD File 
A
cyclohexylmethyl-[[2-[[(4-oxidanylidenepyrido[1,2-a]pyrimidin-2-yl)carbonylamino]methyl]imidazo[1,2-a]pyridin-6-yl]methyl]azanium
C25 H29 N6 O2
OBERVORNENYOLE-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.188 
  • R-Value Observed: 0.188 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.93α = 90
b = 48.93β = 90
c = 82.18γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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