1PEN

ALPHA-CONOTOXIN PNI1

• PDB DOI: https://doi.org/10.2210/pdb1PEN/pdb

• Classification: NEUROTOXIN
• Organism(s): Conus pennaceus
• Mutation(s): No 


• Deposited: 1996-01-29 Released: 1997-04-21 
• Deposition Author(s): Hu, S.-H., Gehrmann, J., Guddat, L.W., Alewood, P.F., Craik, D.J., Martin, J.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.10 Å
• R-Value Free: 0.152 
• R-Value Work: 0.127 
• R-Value Observed: 0.127 

Literature

The 1.1 A crystal structure of the neuronal acetylcholine receptor antagonist, alpha-conotoxin PnIA from Conus pennaceus.

Hu, S.H., Gehrmann, J., Guddat, L.W., Alewood, P.F., Craik, D.J., Martin, J.L.

(1996) Structure 4: 417-423

• PubMed: 8740364 
• DOI: https://doi.org/10.1016/s0969-2126(96)00047-0
• Primary Citation of Related Structures:  
  1PEN


• PubMed Abstract: 
  

  alpha-Conotoxins are peptide toxins, isolated from Conus snails, that block the nicotinic acetylcholine receptor (nAChR). The 16-residue peptides PnIA and PnIB from Conus pennaceus incorporate the same disulfide framework as other alpha-conotoxins but differ in function from most alpha-conotoxins by blocking the neuronal nAChR, rather than the skeletal muscle subtype. The crystal structure determination of PnIA was undertaken to identify structural and surface features that might be important for biological activity.

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Organizational Affiliation: 

Centre for Drug Design and Development, University of Queensland, St Lucia, Australia.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1.63 kDa 
• Atom Count: 122 
• Modelled Residue Count: 17 
• Deposited Residue Count: 17 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-CONOTOXIN PNIA	A	17	Conus pennaceus	Mutation(s): 0
UniProt
Find proteins for P50984 (Conus pennaceus) Explore P50984  Go to UniProtKB:  P50984

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.10 Å
• R-Value Free: 0.152 
• R-Value Work: 0.127 
• R-Value Observed: 0.127 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 15	α = 90
b = 19.8	β = 113.4
c = 16.5	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-04-21 
Deposition Author(s): Hu, S.-H., Gehrmann, J., Guddat, L.W., Alewood, P.F., Craik, D.J., Martin, J.L.

Revision History  

• Version 1.0: 1997-04-21
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance