1AV3

POTASSIUM CHANNEL BLOCKER KAPPA CONOTOXIN PVIIA FROM C. PURPURASCENS, NMR, 20 STRUCTURES

• PDB DOI: https://doi.org/10.2210/pdb1AV3/pdb

• Classification: POTASSIUM CHANNEL BLOCKER
• Organism(s): Conus purpurascens
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 1997-09-24 Released: 1998-10-14 
• Deposition Author(s): Scanlon, M.J., Naranjo, D., Thomas, L., Alewood, P.F., Lewis, R.J., Craik, D.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: LOWEST ENERGY AND AGREEMENT WITH EXPERIMENTAL RESTRAINTS 

Literature

Solution structure and proposed binding mechanism of a novel potassium channel toxin kappa-conotoxin PVIIA.

Scanlon, M.J., Naranjo, D., Thomas, L., Alewood, P.F., Lewis, R.J., Craik, D.J.

(1997) Structure 5: 1585-1597

• PubMed: 9438859 
• DOI: https://doi.org/10.1016/s0969-2126(97)00307-9
• Primary Citation of Related Structures:  
  1AV3


• PubMed Abstract: 
  

  kappa-PVIIA is a 27-residue polypeptide isolated from the venom of Conus purpurascens and is the first member of a new class of conotoxins that block potassium channels. By comparison to other ion channels of eukaryotic cell membranes, voltage-sensitive potassium channels are relatively simple and methodology has been developed for mapping their interactions with small-peptide toxins. PVIIA, therefore, is a valuable new probe of potassium channel structure. This study of the solution structure and mode of channel binding of PVIIA forms the basis for mapping the interacting residues at the conotoxin-ion channel interface.

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Organizational Affiliation: 

Centre for Drug Design and Development, University of Queensland, St. Lucia, Australia. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.28 kDa 
• Atom Count: 224 
• Modelled Residue Count: 27 
• Deposited Residue Count: 27 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kappa-conotoxin PVIIA	A	27	Conus purpurascens	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for P56633 (Conus purpurascens) Explore P56633  Go to UniProtKB:  P56633

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
HYP	A	L-PEPTIDE LINKING	C5 H9 N O3		PRO

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: LOWEST ENERGY AND AGREEMENT WITH EXPERIMENTAL RESTRAINTS 

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-10-14 
Deposition Author(s): Scanlon, M.J., Naranjo, D., Thomas, L., Alewood, P.F., Lewis, R.J., Craik, D.J.

Revision History  

• Version 1.0: 1998-10-14
  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: 2020-12-16
  Changes: Database references, Derived calculations, Non-polymer description, Other, Source and taxonomy, Structure summary