1X5V

NMR Structure of PcFK1

• PDB DOI: https://doi.org/10.2210/pdb1X5V/pdb
• BMRB: 6636

• Classification: TOXIN
• Organism(s): Psalmopoeus cambridgei
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2005-05-17 Released: 2006-04-04 
• Deposition Author(s): Pimentel, C., Choi, S.J., Chagot, B., Guette, C., Camadro, J.M., Darbon, H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 25 
• Selection Criteria: structures with the lowest energy, structures with the least restraint violations 

Literature

Solution structure of PcFK1, a spider peptide active against Plasmodium falciparum

Pimentel, C., Choi, S.J., Chagot, B., Guette, C., Camadro, J.M., Darbon, H.

(2006) Protein Sci 15: 628-634

• PubMed: 16452619 
• DOI: https://doi.org/10.1110/ps.051860606
• Primary Citation of Related Structures:  
  1X5V


• PubMed Abstract: 
  

  Psalmopeotoxin I (PcFK1) is a 33-amino-acid residue peptide isolated from the venom of the tarantula Psalmopoeus cambridgei. It has been recently shown to possess strong antiplasmodial activity against the intra-erythrocyte stage of Plasmodium falciparum in vitro. Although the molecular target for PcFK1 is not yet determined, this peptide does not lyse erythrocytes, is not cytotoxic to nucleated mammalian cells, and does not inhibit neuromuscular function. We investigated the structural properties of PcFK1 to help understand the unique mechanism of action of this peptide and to enhance its utility as a lead compound for rational development of new antimalarial drugs. In this paper, we have determined the three-dimensional solution structure by (1)H two-dimensional NMR means of recombinant PcFK1, which is shown to belong to the ICK structural superfamily with structural determinants common to several neurotoxins acting as ion channels effectors.

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Organizational Affiliation: 

AFMB, CNRS UMR 6098 and Universités d'Aix-Marseille I and II, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.71 kDa 
• Atom Count: 255 
• Modelled Residue Count: 34 
• Deposited Residue Count: 34 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PcFK1	A	34	Psalmopoeus cambridgei	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for P0C201 (Psalmopoeus cambridgei) Explore P0C201  Go to UniProtKB:  P0C201

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
HSL	A	L-PEPTIDE LINKING	C4 H7 N O2		SER

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 25 
• Selection Criteria: structures with the lowest energy, structures with the least restraint violations 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-04-04 
Deposition Author(s): Pimentel, C., Choi, S.J., Chagot, B., Guette, C., Camadro, J.M., Darbon, H.

Revision History  

• Version 1.0: 2006-04-04
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-02
  Changes: Data collection, Database references, Derived calculations