1IMT

MAMBA INTESTINAL TOXIN 1, NMR, 39 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 110 
  • Conformers Submitted: 39 
  • Selection Criteria: LEAST RESTRAINT VIOLATION AND BEST PHYSICAL ENERGY 

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This is version 1.2 of the entry. See complete history


Literature

A structural homologue of colipase in black mamba venom revealed by NMR floating disulphide bridge analysis.

Boisbouvier, J.Albrand, J.P.Blackledge, M.Jaquinod, M.Schweitz, H.Lazdunski, M.Marion, D.

(1998) J Mol Biol 283: 205-219

  • DOI: 10.1006/jmbi.1998.2057
  • Primary Citation of Related Structures:  
    1IMT

  • PubMed Abstract: 
  • The solution structure of mamba intestinal toxin 1 (MIT1), isolated from Dendroaspis polylepis polylepis venom, has been determined. This molecule is a cysteine-rich polypeptide exhibiting no recognised family membership. Resistance to MIT1 to classical specific endoproteases produced contradictory NMR and biochemical information concerning disulphide-bridge topology ...

    The solution structure of mamba intestinal toxin 1 (MIT1), isolated from Dendroaspis polylepis polylepis venom, has been determined. This molecule is a cysteine-rich polypeptide exhibiting no recognised family membership. Resistance to MIT1 to classical specific endoproteases produced contradictory NMR and biochemical information concerning disulphide-bridge topology. We have used distance restraints allowing ambiguous partners between S atoms in combination with NMR-derived structural information, to correctly determine the disulphide-bridge topology. The resultant solution structure of MIT1, determined to a resolution of 0.5 A, reveals an unexpectedly similar global fold with respect to colipase, a protein involved in fatty acid digestion. Colipase exhibits an analogous resistance to endoprotease activity, indicating for the first time the possible topological origins of this biochemical property. The biochemical and structural homology permitted us to propose a mechanically related digestive function for MIT1 and provides novel information concerning snake venom protein evolution.


    Organizational Affiliation

    Institut de Biologie Structurale Jean-Pierre Ebel (CEA-CNRS), 41 Av. des Martyrs, 38027 Grenoble, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INTESTINAL TOXIN 1 A80Dendroaspis polylepis polylepisMutation(s): 0 
Find proteins for P25687 (Dendroaspis polylepis polylepis)
Explore P25687 
Go to UniProtKB:  P25687
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 110 
  • Conformers Submitted: 39 
  • Selection Criteria: LEAST RESTRAINT VIOLATION AND BEST PHYSICAL ENERGY 
  • OLDERADO: 1IMT Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-20
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance