Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 26.00 kDa 
• Atom Count: 1991 
• Modelled Residue Count: 212 
• Deposited Residue Count: 218 
• Unique protein chains: 1

4D01

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

• PDB DOI: 10.2210/pdb4D01/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Komagataella pastoris
• Mutation(s): No 


• 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: 1.79 Å
• R-Value Free: 0.250 
• R-Value Work: 0.195 
• R-Value Observed: 0.196 

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:  
  4D01, 4UXU, 4UY2


• 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: 

1] Department of Neurobiology, Hellenic Pasteur Institute, Athens, Greece. [2] Department of Pharmacy, University of Patras, Rio, Greece.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NEURONAL ACETYLCHOLINE RECEPTOR SUBUNIT ALPHA-9	A	218	Homo sapiens	Mutation(s): 0  Gene Names: CHRNA9, NACHRA9
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UGM1 (Homo sapiens) Explore Q9UGM1  Go to UniProtKB:  Q9UGM1
PHAROS:  Q9UGM1

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	B [auth A], C [auth A]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
EDO	D [auth A], E [auth A], F [auth A], G [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.79 Å
• R-Value Free: 0.250 
• R-Value Work: 0.195 
• R-Value Observed: 0.196 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.52	α = 90
b = 64.269	β = 90
c = 80.138	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
SCALA	data scaling
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
  Changes: Database references
• Version 1.2: 2014-10-15
  Changes: Database references
• Version 1.3: 2014-11-19
  Changes: Database references
• Version 1.4: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Other, Structure summary