1BIG

SCORPION TOXIN BMTX1 FROM BUTHUS MARTENSII KARSCH, NMR, 25 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 25 
  • Conformers Submitted: 25 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Solution structure of two new toxins from the venom of the Chinese scorpion Buthus martensi Karsch blockers of potassium channels.

Blanc, E.Romi-Lebrun, R.Bornet, O.Nakajima, T.Darbon, H.

(1998) Biochemistry 37: 12412-12418

  • DOI: 10.1021/bi9809371
  • Primary Citation of Related Structures:  
    2BMT, 1BIG

  • PubMed Abstract: 
  • The solution structure of BmTX2 purified from the venom of the Chinese Buthid Buthus martensi has been determined by 2D NMR spectroscopy techniques which led to the description of its 3D conformation. The structure consists of a triple-stranded beta-sheet connected to a helical structure ...

    The solution structure of BmTX2 purified from the venom of the Chinese Buthid Buthus martensi has been determined by 2D NMR spectroscopy techniques which led to the description of its 3D conformation. The structure consists of a triple-stranded beta-sheet connected to a helical structure. This helix encompasses 10 residues, from 11 to 20, begins with a turn of 310 helix, and ends with an alpha helix. The three strands of beta sheet comprise residues 2-6, with a bulge covering residues 4 and 5, 26-29, and 32-35, with a type I' beta turn centered on residues 30-31. We also characterized the solution structure of BmTX1. The two toxins which are potent blockers of both large-conductance calcium-activated potassium channels (BKCa channels) and voltage-gated potassium channels (Kv1. 3) are highly superimposable and possess the same structural characteristics. Analysis of these structures allows us to hypothesize that, besides the main surface of interaction described by the functional map of charybdotoxin, one can expect that the binding of scorpion toxins on BKCa channels may involve residues on the edge of this surface.


    Organizational Affiliation

    AFMB, CNRS UPR 9039, IFR1, 31, Marseille, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TOXIN BMTX1A37Mesobuthus martensiiMutation(s): 0 
UniProt
Find proteins for Q9NII6 (Mesobuthus martensii)
Explore Q9NII6 
Go to UniProtKB:  Q9NII6
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 25 
  • Conformers Submitted: 25 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 
  • OLDERADO: 1BIG Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-12-25
    Changes: Derived calculations, Other, Polymer sequence