Macromolecule Content

• Total Structure Weight: 2.10 kDa 
• Atom Count: 142 
• Modelled Residue Count: 19 
• Deposited Residue Count: 19 
• Unique protein chains: 1

1K64

NMR Structue of alpha-conotoxin EI

• DOI: 10.2210/pdb1K64/pdb

• Classification: TOXIN
• Mutation(s): Yes 
• Membrane Protein: Yes  OPM


• Deposited: 2001-10-15 Released: 2003-09-09 
• Deposition Author(s): Park, K.H., Suk, J.E., Jacobsen, R., Gray, W.R., McIntosh, J.M., Han, K.H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: back calculated data agree with experimental NOESY spectrum,structures with acceptable covalent geometry,structures with the least restraint violations 

Literature

Solution conformation of alpha-conotoxin EI, a neuromuscular toxin specific for the alpha 1/delta subunit interface of torpedo nicotinic acetylcholine receptor

Park, K.H., Suk, J.E., Jacobsen, R., Gray, W.R., McIntosh, J.M., Han, K.H.

(2001) J Biol Chem 276: 49028-49033

• PubMed: 11641403 
• DOI: 10.1074/jbc.M107798200
• Primary Citation of Related Structures:  
  1K64


• PubMed Abstract: 
  

A high resolution structure of alpha-conotoxin EI has been determined by (1)H NMR spectroscopy and molecular modeling. alpha-Conotoxin EI has the same disulfide framework as alpha 4/7 conotoxins targeting neuronal nicotinic acetylcholine receptors but antagonizes the neuromuscular receptor as do the alpha 3/5 and alpha A conotoxins. The unique binding preference of alpha-conotoxin EI to the alpha(1)/delta subunit interface of Torpedo neuromuscular receptor makes it a valuable structural template for superposition of various alpha-conotoxins possessing distinct receptor subtype specificities. Structural comparison of alpha-conotoxin EI with the gamma-subunit favoring alpha-conotoxin GI suggests that the Torpedo delta-subunit preference of the former originates from its second loop. Superposition of three-dimensional structures of seven alpha-conotoxins reveals that the estimated size of the toxin-binding pocket in nicotinic acetylcholine receptor is approximately 20 A (height) x 20 A (width) x 15 A (thickness).

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Organizational Affiliation: 

Protein Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology, Yusong P. O. Box 115, Taejon, Korea.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
alpha-conotoxin EI	A	19	N/A	Mutation(s): 1  Membrane Entity: Yes
UniProt
Find proteins for P50982 (Conus ermineus) Explore P50982  Go to UniProtKB:  P50982

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: back calculated data agree with experimental NOESY spectrum,structures with acceptable covalent geometry,structures with the least restraint violations 
• OLDERADO: 1K64 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-10-15 
• Released Date: 2003-09-09 
Deposition Author(s): Park, K.H., Suk, J.E., Jacobsen, R., Gray, W.R., McIntosh, J.M., Han, K.H.

Revision History  

• Version 1.0: 2003-09-09
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance