Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 25997.72 
• Atom Count: 1785 
• Residue Count: 218 
• Unique protein chains: 1

4D01

Crystal Structure of the Extracellular Domain of the Human Alpha9 Nicotinic Acetylcholine Receptor

• DOI: 10.2210/pdb4D01/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Komagataella pastoris


• Deposited: 2014-04-23 Released: 2014-10-01 
• Deposition Author(s): Giastas, P., Zouridakis, M., Zarkadas, E., Tzartos, S.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.795 Å
• R-Value Free: 0.250 
• R-Value Work: 0.195 

Literature

Crystal Structures of Free and Antagonist-Bound States of Human Alpha9 Nicotinic Receptor Extracellular Domain

Zouridakis, M., Giastas, P., Zarkadas, E., Chroni-Tzartou, D., Bregestovski, P., Tzartos, S.J.

(2014) Nat.Struct.Mol.Biol. 21: 976

• PubMed: 25282151 
• DOI: 10.1038/nsmb.2900
• Primary Citation of Related Structures:  
  4UY2, 4UXU


• PubMed Abstract: 
  

We determined the X-ray crystal structures of the extracellular domain (ECD) of the monomeric state of human neuronal α9 nicotinic acetylcholine receptor (nAChR) and of its complexes with the antagonists methyllycaconitine and α-bungarotoxin at resolutions of 1.8 Å, 1.7 Å and 2.7 Å, respectively. The structure of the monomeric α9 ECD superimposed well with the structures of homologous proteins in pentameric assemblies, denoting native folding, despite the absence of a complementary subunit and transmembrane domain. The interaction motifs of both antagonists were similar to those in the complexes with homologous pentameric proteins, thus highlighting the major contribution of the principal side of α9 ECD to their binding. The structures revealed a functionally important β7-β10 strand interaction in α9-containing nAChRs, involving their unique Thr147, a hydration pocket similar to that of mouse α1 ECD and a membrane-facing network coordinated by the invariant Arg210.

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Organizational Affiliation: 

Department of Neurobiology, Hellenic Pasteur Institute, Athens, Greece.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
NEURONAL ACETYLCHOLINE RECEPTOR SUBUNIT ALPHA-9	A	218	Homo sapiens	Mutation(s): 0  Gene Names: CHRNA9 (NACHRA9)
Find proteins for Q9UGM1 (Homo sapiens) Go to Gene View: CHRNA9 Go to UniProtKB:  Q9UGM1

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
EDO	A	1,2-ETHANEDIOL ETHYLENE GLYCOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.795 Å
• R-Value Free: 0.250 
• R-Value Work: 0.195 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 49.520	α = 90.00
b = 64.269	β = 90.00
c = 80.138	γ = 90.00

Software Package:

Software Name	Purpose
XDS	data reduction
SCALA	data scaling
PHENIX	refinement
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-04-23 
• Released Date: 2014-10-01 
• Deposition Author(s): Giastas, P., Zouridakis, M., Zarkadas, E., Tzartos, S.J.

Revision History 

• Version 1.0: 2014-10-01
  Type: Initial release
• Version 1.1: 2014-10-08
  Type: Database references
• Version 1.2: 2014-10-15
  Type: Database references
• Version 1.3: 2014-11-19
  Type: Database references