1UV6

X-ray structure of acetylcholine binding protein (AChBP) in complex with carbamylcholine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Nicotine and Carbamylcholine Binding to Nicotinic Acetylcholine Receptors as Studied in Achbp Crystal Structures

Celie, P.H.N.Van Rossum-Fikkert, S.E.Van Dijk, W.J.Brejc, K.Smit, A.B.Sixma, T.K.

(2004) Neuron 41: 907

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Nicotinic acetylcholine receptors are prototypes for the pharmaceutically important family of pentameric ligand-gated ion channels. Here we present atomic resolution structures of nicotine and carbamylcholine binding to AChBP, a water-soluble homolog ...

    Nicotinic acetylcholine receptors are prototypes for the pharmaceutically important family of pentameric ligand-gated ion channels. Here we present atomic resolution structures of nicotine and carbamylcholine binding to AChBP, a water-soluble homolog of the ligand binding domain of nicotinic receptors and their family members, GABAA, GABAC, 5HT3 serotonin, and glycine receptors. Ligand binding is driven by enthalpy and is accompanied by conformational changes in the ligand binding site. Residues in the binding site contract around the ligand, with the largest movement in the C loop. As expected, the binding is characterized by substantial aromatic and hydrophobic contributions, but additionally there are close contacts between protein oxygens and positively charged groups in the ligands. The higher affinity of nicotine is due to a main chain hydrogen bond with the B loop and a closer packing of the aromatic groups. These structures will be useful tools for the development of new drugs involving nicotinic acetylcholine receptor-associated diseases.


    Related Citations: 
    • A Glia-Derived Acetylcholine-Binding Protein that Modulates Synaptic Transmission
      Smit, A.B.,Syed, N.I.,Schaap, D.,Van Minnen, J.,Klumperman, J.,Kits, K.S.,Lodder, H.,Van Der Schors, R.C.,Van Elk, R.,Sorgedrager, B.,Brejc, K.,Sixma, T.K.,Geraerts, W.P.M.
      (2001) Nature 411: 261
    • Crystal Structure of an Ach-Binding Protein Reveals the Ligand-Binding Domain of Nicotinic Receptors
      Brejc, K.,Van Dijk, W.J.,Klaassen, R.,Schuurmans, M.,Van Der Oost, J.,Smit, A.B.,Sixma, T.K.
      (2001) Nature 411: 269


    Organizational Affiliation

    Division of Molecular Carcinogenesis, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE-BINDING PROTEIN
A, B, C, D, E, F, G, H, I, J
210Lymnaea stagnalisMutation(s): 0 
Find proteins for P58154 (Lymnaea stagnalis)
Go to UniProtKB:  P58154
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CCE
Query on CCE

Download SDF File 
Download CCD File 
C, D, J
2-[(AMINOCARBONYL)OXY]-N,N,N-TRIMETHYLETHANAMINIUM
CARBAMYL-CHOLINE
C6 H15 N2 O2
VPJXQGSRWJZDOB-UHFFFAOYSA-O
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CCEKd: 7575 nM BINDINGMOAD
CCEKd: 7575 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.227 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 140.900α = 90.00
b = 140.900β = 90.00
c = 240.412γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
AMoREphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance