2MOA

Solution NMR structure of peptide ImI1 (peak 2)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Dithiol amino acids can structurally shape and enhance the ligand-binding properties of polypeptides.

Chen, S.Gopalakrishnan, R.Schaer, T.Marger, F.Hovius, R.Bertrand, D.Pojer, F.Heinis, C.

(2014) Nat Chem 6: 1009-1016

  • DOI: 10.1038/nchem.2043
  • Primary Citation of Related Structures:  4OS1, 4OS2, 4OS4, 4OS5, 4OS6, 4OS7

  • PubMed Abstract: 
  • The disulfide bonds that form between two cysteine residues are important in defining and rigidifying the structures of proteins and peptides. In polypeptides containing multiple cysteine residues, disulfide isomerization can lead to multiple product ...

    The disulfide bonds that form between two cysteine residues are important in defining and rigidifying the structures of proteins and peptides. In polypeptides containing multiple cysteine residues, disulfide isomerization can lead to multiple products with different biological activities. Here, we describe the development of a dithiol amino acid (Dtaa) that can form two disulfide bridges at a single amino acid site. Application of Dtaas to a serine protease inhibitor and a nicotinic acetylcholine receptor inhibitor that contain disulfide constraints enhanced their inhibitory activities 40- and 7.6-fold, respectively. X-ray crystallographic and NMR structure analysis show that the peptide ligands containing Dtaas have retained their native tertiary structures. We furthermore show that replacement of two cysteines by Dtaas can avoid the formation of disulfide bond isomers. With these properties, Dtaas are likely to have broad application in the rational design or directed evolution of peptides and proteins with high activity and stability.


    Related Citations: 
    • NMR solution structure of alpha-conotoxin ImI and comparison to other conotoxins specific for neuronal nicotinic acetylcholine receptors.
      Rogers, J.P.,Luginbuhl, P.,Shen, G.S.,McCabe, R.T.,Stevens, R.C.,Wemmer, D.E.
      (1999) Biochemistry 38: 3874
    • Structural determinants of selective alpha-conotoxin binding to a nicotinic acetylcholine receptor homolog AChBP.
      Ulens, C.,Hogg, R.C.,Celie, P.H.,Bertrand, D.,Tsetlin, V.,Smit, A.B.,Sixma, T.K.
      (2006) Proc.Natl.Acad.Sci.USA 103: 3615
    • NMR spatial structure of alpha-conotoxin ImI reveals a common scaffold in snail and snake toxins recognizing neuronal nicotinic acetylcholine receptors.
      Maslennikov, I.V.,Shenkarev, Z.O.,Zhmak, M.N.,Ivanov, V.T.,Methfessel, C.,Tsetlin, V.I.,Arseniev, A.S.
      (1999) Febs Lett. 444: 275
    • Solution structure of alpha-conotoxin ImI by 1H nuclear magnetic resonance.
      Gehrmann, J.,Daly, N.L.,Alewood, P.F.,Craik, D.J.
      (1999) J.Med.Chem. 42: 2364
    • Minimal conformation of the alpha-conotoxin ImI for the alpha7 neuronal nicotinic acetylcholine receptor recognition: correlated CD, NMR and binding studies.
      Lamthanh, H.,Jegou-Matheron, C.,Servent, D.,Menez, A.,Lancelin, J.M.
      (1999) Febs Lett. 454: 293


    Organizational Affiliation

    Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-conotoxin ImI
A
13Conus imperialisN/A
Find proteins for P50983 (Conus imperialis)
Go to UniProtKB:  P50983
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_001232
Query on PRD_001232
AAlpha-conotoxin ImI mutantCyclic peptide / Toxin

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2014-04-24 
  • Released Date: 2014-09-24 
  • Deposition Author(s): Heinis, C., Chen, S.

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2014-11-05
    Type: Database references