1SBU

NMR structure of a peptide containing a dimetylthiazolidine : an analog of delta conotoxin EVIA loop 2

• PDB DOI: https://doi.org/10.2210/pdb1SBU/pdb

• Classification: TOXIN
• Organism(s): Conus ermineus
• Mutation(s): No 


• Deposited: 2004-02-11 Released: 2004-02-24 
• Deposition Author(s): Figuet, M., Chierici, S., Jourdan, M., Dumy, P.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations, structures with the lowest energy 

Literature

A case study of 2,2-dimethylthiazolidine as locked cis proline amide bond: synthesis, NMR and molecular modeling studies of a [small delta]-conotoxin EVIA peptide analog.

Chierici, S., Jourdan, M., Figuet, M., Dumy, P.

(2004) Org Biomol Chem 2: 2437-2441

• PubMed: 15326523 
• DOI: https://doi.org/10.1039/B408325C
• Primary Citation of Related Structures:  
  1SBU


• PubMed Abstract: 
  

  The delta-conotoxin EVIA from the Conus ermineus venom, a recently characterized toxin, exhibits cis-trans isomerism of the Leu12-Pro13 bond associated with the triggering of its biological activity. In this paper we use the pseudoproline concept to target the presumed bioactive cis conformation. We report the design and the synthesis of loop 2 analogs from residue 8 to 18 containing either the cis-inducing Cys(PsiMe,MePro)13 unit or the natural proline residue. NMR studies in water and molecular modeling allowed us to identify the amide bond "locked" in a cis conformation for as in the suggested bioactive form of the natural toxin.

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Organizational Affiliation: 

LEDSS UMR 5616 & ICMG-FR2607, Universite Joseph Fourier, BP 53, 38041, Grenoble cedex 9, France.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1.16 kDa 
• Atom Count: 81 
• Modelled Residue Count: 11 
• Deposited Residue Count: 11 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
delta-conotoxin EVIA	A	11	Conus ermineus	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
2MT	A	L-PEPTIDE LINKING	C6 H11 N O2 S		PRO

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations, structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-02-24 
Deposition Author(s): Figuet, M., Chierici, S., Jourdan, M., Dumy, P.

Revision History  

• Version 1.0: 2004-02-24
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-06-24
  Changes: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary