1F94

THE 0.97 RESOLUTION STRUCTURE OF BUCANDIN, A NOVEL TOXIN ISOLATED FROM THE MALAYAN KRAIT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.124 
  • R-Value Observed: 0.123 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The atomic resolution structure of bucandin, a novel toxin isolated from the Malayan krait, determined by direct methods.

Kuhn, P.Deacon, A.M.Comoso, S.Rajaseger, G.Kini, R.M.Uson, I.Kolatkar, P.R.

(2000) Acta Crystallogr D Biol Crystallogr 56: 1401-1407

  • DOI: 10.1107/s0907444900011501
  • Primary Citation of Related Structures:  
    1F94

  • PubMed Abstract: 
  • Bucandin is a novel presynaptic neurotoxin isolated from Bungarus candidus (Malayan krait). It has the unique property of enhancing presynaptic acetylcholine release and represents a family of three-finger toxins with an additional disulfide in the first loop ...

    Bucandin is a novel presynaptic neurotoxin isolated from Bungarus candidus (Malayan krait). It has the unique property of enhancing presynaptic acetylcholine release and represents a family of three-finger toxins with an additional disulfide in the first loop. There are no existing structures from this sub-category of three-finger toxins. The X-ray crystal structure of bucandin has been determined by the Shake-and-Bake direct-methods procedure. The resulting electron-density maps were of outstanding quality and allowed the automated tracing of 61 of the 63 amino-acid residues, including their side chains, and the placement of 48 solvent molecules. The 0.97 A resolution full-matrix least-squares refinement converged to a crystallographic R factor of 12.4% and the final model contains 118 solvent molecules. This is the highest resolution structure of any member of the three-finger toxin family and thus it can serve as the best model for other members of the family. Furthermore, the structure of this novel toxin will help in understanding its unique ability to enhance acetylcholine release. The unique structure resulting from the fifth disulfide bond residing in the first loop improves the understanding of other toxins with a similar arrangement of disulfide bonds.


    Organizational Affiliation

    Stanford Synchrotron Radiation Laboratory, SLAC, PO Box 4349, MS69, Stanford University, Stanford, CA 94309, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BUCANDINA63Bungarus candidusMutation(s): 0 
UniProt
Find proteins for P81782 (Bungarus candidus)
Explore P81782 
Go to UniProtKB:  P81782
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.124 
  • R-Value Observed: 0.123 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.97α = 90
b = 22.52β = 100.23
c = 32.6γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
SnBphasing
SHELXmodel building
SHELXL-97refinement
CCP4data scaling
SHELXphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-07-26
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description