1CHZ

A NEW NEUROTOXIN FROM BUTHUS MARTENSII KARSCH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of a new neurotoxin from the scorpion Buthus martensii Karsch at 1.76 A.

He, X.L.Deng, J.P.Wang, M.Zhang, Y.Wang, D.C.

(2000) Acta Crystallogr.,Sect.D 56: 25-33


  • PubMed Abstract: 
  • A new neurotoxin BmK M2, toxic to both mammals and insects, with the strongest toxicity in the BmK toxin series, has been purified from the Chinese scorpion Buthus martensii Karsch and crystallized with MPD at pH 7.5. The crystals are orthorhombic, b ...

    A new neurotoxin BmK M2, toxic to both mammals and insects, with the strongest toxicity in the BmK toxin series, has been purified from the Chinese scorpion Buthus martensii Karsch and crystallized with MPD at pH 7.5. The crystals are orthorhombic, belonging to space group P2(1)2(1)2(1), with unit-cell parameters a = 36.64, b = 36.95, c = 37.23 A. The structure was solved by molecular replacement and refined to R = 0.186 for all reflections to a resolution of 1.76 A. The whole sequence (64 residues) of BmK M2 was determined by crystallographic analysis based on high-resolution data and the homologous model of BmK M8. The refined BmK M2 structure shows a non-proline cis peptide bond between Pro9 and His10 which enables the C-terminal segment to adopt a conformation different to that of the weak toxin BmK M8. Recently, a mutation analysis had suggested that both the tenth residue and the C-terminus play key roles in receptor binding. Therefore, these features may be related to the binding selectivity of the group III alpha-like toxins. The charge changes of residues 8, 10, 18, 28, 55 and 59 from neutral or negative to positive or neutral, which leads to a positive electrostatic potential surface, may be responsible for the high toxicity of BmK M2.


    Related Citations: 
    • Crystal Structure of an Acid Neurotoxin from Scorpion Buthus Martensii Karsch at 1.85 A Resolution
      Li, H.M.,Wang, D.C.,Zeng, Z.H.,Jin, L.I.,Hu, R.Q.
      (1996) J.Mol.Biol. 261: 415
    • Purification and Partial Characterization of Several New Nerotoxins from East- Asia Scorpion
      Hu, R.Q.,Wang, M.,Liu, J.N.,Lei, K.J.
      (1989) Zool.Res.Sinica. 10: 185


    Organizational Affiliation

    Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (BMK M2)
A
64Mesobuthus martensiiN/A
Find proteins for P58488 (Mesobuthus martensii)
Go to UniProtKB:  P58488
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.640α = 90.00
b = 37.310β = 90.00
c = 37.950γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
DENZOdata reduction
X-PLORmodel building
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-31
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2014-04-09
    Type: Database references