4XK9

Crystal structure of A-AChBP in complex with pinnatoxin G


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

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This is version 1.1 of the entry. See complete history


Literature

Marine Macrocyclic Imines, Pinnatoxins A and G: Structural Determinants and Functional Properties to Distinguish Neuronal alpha 7 from Muscle alpha 12 beta gamma delta nAChRs.

Bourne, Y.Sulzenbacher, G.Radic, Z.Araoz, R.Reynaud, M.Benoit, E.Zakarian, A.Servent, D.Molgo, J.Taylor, P.Marchot, P.

(2015) Structure 23: 1106-1115

  • DOI: 10.1016/j.str.2015.04.009
  • Primary Citation of Related Structures:  
    4XHE, 4XK9

  • PubMed Abstract: 
  • Pinnatoxins are macrocyclic imine phycotoxins associated with algal blooms and shellfish toxicity. Functional analysis of pinnatoxin A and pinnatoxin G by binding and voltage-clamp electrophysiology on membrane-embedded neuronal α7, α4β2, α3β2, and muscle-type α12βγδ nicotinic acetylcholine receptors (nAChRs) reveals high-affinity binding and potent antagonism for the α7 and α12βγδ subtypes ...

    Pinnatoxins are macrocyclic imine phycotoxins associated with algal blooms and shellfish toxicity. Functional analysis of pinnatoxin A and pinnatoxin G by binding and voltage-clamp electrophysiology on membrane-embedded neuronal α7, α4β2, α3β2, and muscle-type α12βγδ nicotinic acetylcholine receptors (nAChRs) reveals high-affinity binding and potent antagonism for the α7 and α12βγδ subtypes. The toxins also bind to the nAChR surrogate, acetylcholine-binding protein (AChBP), with low Kd values reflecting slow dissociation. Crystal structures of pinnatoxin-AChBP complexes (1.9-2.2 Å resolution) show the multiple anchoring points of the hydrophobic portion, the cyclic imine, and the substituted bis-spiroketal and cyclohexene ring systems of the pinnatoxins that dictate tight binding between the opposing loops C and F at the receptor subunit interface, as observed for the 13-desmethyl-spirolide C and gymnodimine A congeners. Uniquely, however, the bulky bridged EF-ketal ring specific to the pinnatoxins extends radially from the interfacial-binding pocket to interact with the sequence-variable loop F and govern nAChR subtype selectivity and central neurotoxicity.


    Organizational Affiliation

    Aix-Marseille Université, Laboratoire Architecture et Fonction des Macromolécules Biologiques, Campus Luminy, 13288 Marseille cedex 9, France; Centre National de la Recherche Scientifique, Laboratoire Architecture et Fonction des Macromolécules Biologiques, Campus Luminy, 13288 Marseille cedex 9, France. Electronic address: pascale.marchot@univ-amu.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Soluble acetylcholine receptor
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J
228Aplysia californicaMutation(s): 0 
UniProt
Find proteins for Q8WSF8 (Aplysia californica)
Explore Q8WSF8 
Go to UniProtKB:  Q8WSF8
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
41J (Subject of Investigation/LOI)
Query on 41J

Download Ideal Coordinates CCD File 
K [auth A] , M [auth B] , O [auth C] , Q [auth D] , R [auth E] , T [auth F] , U [auth G] , W [auth H] , 
K [auth A], M [auth B], O [auth C], Q [auth D], R [auth E], T [auth F], U [auth G], W [auth H], Y [auth I], Z [auth J]
Pinnatoxin G
C42 H63 N O7
KOWHOZGQQMALMV-WVYVHXBHSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
AA [auth J], L [auth A], N [auth B], P [auth C], S [auth E], V [auth G], X [auth H]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 184.844α = 90
b = 142.918β = 126.48
c = 142.13γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-10
    Changes: Database references