1YI5

Crystal structure of the a-cobratoxin-AChBP complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.20 Å
  • R-Value Free: 0.378 
  • R-Value Work: 0.331 
  • R-Value Observed: 0.333 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a Cbtx-AChBP complex reveals essential interactions between snake alpha-neurotoxins and nicotinic receptors

Bourne, Y.Talley, T.T.Hansen, S.B.Taylor, P.Marchot, P.

(2005) EMBO J 24: 1512-1522

  • DOI: 10.1038/sj.emboj.7600620
  • Primary Citation of Related Structures:  
    1YI5

  • PubMed Abstract: 
  • The crystal structure of the snake long alpha-neurotoxin, alpha-cobratoxin, bound to the pentameric acetylcholine-binding protein (AChBP) from Lymnaea stagnalis, was solved from good quality density maps despite a 4.2 A overall resolution. The structure unambiguously reveals the positions and orientations of all five three-fingered toxin molecules inserted at the AChBP subunit interfaces and the conformational changes associated with toxin binding ...

    The crystal structure of the snake long alpha-neurotoxin, alpha-cobratoxin, bound to the pentameric acetylcholine-binding protein (AChBP) from Lymnaea stagnalis, was solved from good quality density maps despite a 4.2 A overall resolution. The structure unambiguously reveals the positions and orientations of all five three-fingered toxin molecules inserted at the AChBP subunit interfaces and the conformational changes associated with toxin binding. AChBP loops C and F that border the ligand-binding pocket move markedly from their original positions to wrap around the tips of the toxin first and second fingers and part of its C-terminus, while rearrangements also occur in the toxin fingers. At the interface of the complex, major interactions involve aromatic and aliphatic side chains within the AChBP binding pocket and, at the buried tip of the toxin second finger, conserved Phe and Arg residues that partially mimic a bound agonist molecule. Hence this structure, in revealing a distinctive and unpredicted conformation of the toxin-bound AChBP molecule, provides a lead template resembling a resting state conformation of the nicotinic receptor and for understanding selectivity of curaremimetic alpha-neurotoxins for the various receptor species.


    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, CNRS UMR-6098, Marseille, France. yves@afmb.cnrs-mrs.fr



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetylcholine-binding proteinA, C [auth B], E [auth C], G [auth D], I [auth E]210Lymnaea stagnalisMutation(s): 0 
UniProt
Find proteins for P58154 (Lymnaea stagnalis)
Explore P58154 
Go to UniProtKB:  P58154
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Long neurotoxin 1B [auth F], D [auth G], F [auth H], H [auth I], J71Naja siamensisMutation(s): 0 
UniProt
Find proteins for P01391 (Naja kaouthia)
Explore P01391 
Go to UniProtKB:  P01391
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.20 Å
  • R-Value Free: 0.378 
  • R-Value Work: 0.331 
  • R-Value Observed: 0.333 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 162.604α = 90
b = 313.415β = 90
c = 106.548γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
CCP4data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-17
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance