2N8E

Three-dimensional structure of cyclic PVIIA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Efficient enzymatic cyclization of an inhibitory cystine knot-containing peptide.

Kwon, S.Bosmans, F.Kaas, Q.Cheneval, O.Conibear, A.C.Rosengren, K.J.Wang, C.K.Schroeder, C.I.Craik, D.J.

(2016) Biotechnol.Bioeng. 113: 2202-2212

  • DOI: 10.1002/bit.25993

  • PubMed Abstract: 
  • Disulfide-rich peptides isolated from cone snails are of great interest as drug leads due to their high specificity and potency toward therapeutically relevant ion channels and receptors. They commonly contain the inhibitor cystine knot (ICK) motif c ...

    Disulfide-rich peptides isolated from cone snails are of great interest as drug leads due to their high specificity and potency toward therapeutically relevant ion channels and receptors. They commonly contain the inhibitor cystine knot (ICK) motif comprising three disulfide bonds forming a knotted core. Here we report the successful enzymatic backbone cyclization of an ICK-containing peptide κ-PVIIA, a 27-amino acid conopeptide from Conus purpurascens, using a mutated version of the bacterial transpeptidase, sortase A. Although a slight loss of activity was observed compared to native κ-PVIIA, cyclic κ-PVIIA is a functional peptide that inhibits the Shaker voltage-gated potassium (Kv) channel. Molecular modeling suggests that the decrease in potency may be related to the loss of crucial, but previously unidentified electrostatic interactions between the N-terminus of the peptide and the Shaker channel. This hypothesis was confirmed by testing an N-terminally acetylated κ-PVIIA, which shows a similar decrease in activity. We also investigated the conformational dynamics and hydrogen bond network of cyc-PVIIA, both of which are important factors to be considered for successful cyclization of peptides. We found that cyc-PVIIA has the same conformational dynamics, but different hydrogen bond network compared to those of κ-PVIIA. The ability to efficiently cyclize ICK peptides using sortase A will enable future protein engineering for this class of peptides and may help in the development of novel therapeutic molecules. Biotechnol. Bioeng. 2016;113: 2202-2212. © 2016 Wiley Periodicals, Inc.


    Organizational Affiliation

    The University of Queensland, Institute for Molecular Bioscience, Brisbane, Qld, 4072, Australia. d.craik@imb.uq.edu.au.,The University of Queensland, Institute for Molecular Bioscience, Brisbane, Qld, 4072, Australia.,The University of Queensland, Institute for Molecular Bioscience, Brisbane, Qld, 4072, Australia. c.schroeder@imb.uq.edu.au.,Department of Physiology and Solomon H Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland.,The University of Queensland, School of Biomedical Sciences, Brisbane, Qld, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kappa-conotoxin PVIIA
A
34Conus purpurascensMutation(s): 0 
Find proteins for P56633 (Conus purpurascens)
Go to UniProtKB:  P56633
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HYP
Query on HYP
A
L-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2016-10-19
    Type: Database references