Macromolecule Content

• Total Structure Weight: 3.11 kDa 
• Atom Count: 212 
• Modelled Residue Count: 31 
• Deposited Residue Count: 31 
• Unique protein chains: 1

1PQR

Solution Conformation of alphaA-Conotoxin EIVA

• DOI: 10.2210/pdb1PQR/pdb
• BMRB: 5869

• Classification: TOXIN
• Mutation(s): Yes 


• Deposited: 2003-06-18 Released: 2003-11-04 
• Deposition Author(s): Chi, S.-W., Park, K.-H., Suk, J.-E., Olivera, B.M., McIntosh, J.M., Han, K.-H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 18 
• Selection Criteria: back calculated data agree with experimental NOESY spectrum 

Literature

Solution Conformation of alphaA-conotoxin EIVA, a Potent Neuromuscular Nicotinic Acetylcholine Receptor Antagonist from Conus ermineus

Chi, S.-W., Park, K.-H., Suk, J.-E., Olivera, B.M., McIntosh, J.M., Han, K.-H.

(2003) J Biol Chem 278: 42208-42213

• PubMed: 12900418 
• DOI: 10.1074/jbc.M303342200
• Primary Citation of Related Structures:  
  1PQR


• PubMed Abstract: 
  

We report the solution three-dimensional structure of an alphaA-conotoxin EIVA determined by nuclear magnetic resonance spectroscopy and restrained molecular dynamics. The alphaA-conotoxin EIVA consists of 30 amino acids representing the largest peptide among the alpha/alphaA-family conotoxins discovered so far and targets the neuromuscular nicotinic acetylcholine receptor with high affinity. alphaA-Conotoxin EIVA consists of three distinct structural domains. The first domain is mainly composed of the Cys3-Cys11-disulfide loop and is structurally ill-defined with a large backbone root mean square deviation of 1.91 A. The second domain formed by residues His12-Hyp21 is extremely well defined with a backbone root mean square deviation of 0.52 A, thus forming a sturdy stem for the entire molecule. The third C-terminal domain formed by residues Hyp22-Gly29 shows an intermediate structural order having a backbone root mean square deviation of 1.04 A. A structurally ill-defined N-terminal first loop domain connected to a rigid central molecular stem seems to be the general structural feature of the alphaA-conotoxin subfamily. A detailed structural comparison between alphaA-conotoxin EIVA and alphaA-conotoxin PIVA suggests that the higher receptor affinity of alphaA-conotoxin EIVA than alphaA-conotoxin PIVA might originate from different steric disposition and charge distribution in the second loop "handle" motif.

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Organizational Affiliation: 

Department of Biology, University of Utah, Salt Lake City, Utah 84112, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-A-conotoxin EIVA	A	31	N/A	Mutation(s): 5
UniProt
Find proteins for P58782 (Conus ermineus) Explore P58782  Go to UniProtKB:  P58782

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: 18 
• Selection Criteria: back calculated data agree with experimental NOESY spectrum 
• OLDERADO: 1PQR Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-06-18 
• Released Date: 2003-11-04 
Deposition Author(s): Chi, S.-W., Park, K.-H., Suk, J.-E., Olivera, B.M., McIntosh, J.M., Han, K.-H.

Revision History  

• Version 1.0: 2003-11-04
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance