2BYR

CRYSTAL STRUCTURE OF ACHBP FROM APLYSIA CALIFORNICA in complex with methyllycaconitine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of Aplysia Achbp Complexes with Nicotinic Agonists and Antagonists Reveal Distinctive Binding Interfaces and Conformations.

Hansen, S.B.Sulzenbacher, G.Huxford, T.Marchot, P.Taylor, P.Bourne, Y.

(2005) Embo J. 24: 3635

  • DOI: 10.1038/sj.emboj.7600828
  • Primary Citation of Related Structures:  2BYN, 2BYP, 2BYQ, 2BYS

  • PubMed Abstract: 
  • Upon ligand binding at the subunit interfaces, the extracellular domain of the nicotinic acetylcholine receptor undergoes conformational changes, and agonist binding allosterically triggers opening of the ion channel. The soluble acetylcholine-bindin ...

    Upon ligand binding at the subunit interfaces, the extracellular domain of the nicotinic acetylcholine receptor undergoes conformational changes, and agonist binding allosterically triggers opening of the ion channel. The soluble acetylcholine-binding protein (AChBP) from snail has been shown to be a structural and functional surrogate of the ligand-binding domain (LBD) of the receptor. Yet, individual AChBP species display disparate affinities for nicotinic ligands. The crystal structure of AChBP from Aplysia californica in the apo form reveals a more open loop C and distinctive positions for other surface loops, compared with previous structures. Analysis of Aplysia AChBP complexes with nicotinic ligands shows that loop C, which does not significantly change conformation upon binding of the antagonist, methyllycaconitine, further opens to accommodate the peptidic antagonist, alpha-conotoxin ImI, but wraps around the agonists lobeline and epibatidine. The structures also reveal extended and nonoverlapping interaction surfaces for the two antagonists, outside the binding loci for agonists. This comprehensive set of structures reflects a dynamic template for delineating further conformational changes of the LBD of the nicotinic receptor.


    Organizational Affiliation

    Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093-0636, USA.




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
227Aplysia californicaN/A
Find proteins for Q8WSF8 (Aplysia californica)
Go to UniProtKB:  Q8WSF8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MLK
Query on MLK

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
METHYLLYCACONITINE
C37 H50 N2 O10
XLTANAWLDBYGFU-VTLKBQQISA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
MLKKd: 2.8 nM BINDINGMOAD
MLKKd: 2.8 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 67.267α = 90.00
b = 135.776β = 99.46
c = 147.286γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
MOLREPphasing
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Refinement description, Version format compliance