4D01 image
Deposition Date 2014-04-23
Release Date 2014-10-01
Last Version Date 2024-10-09
Entry Detail
PDB ID:
4D01
Title:
Crystal Structure of the Extracellular Domain of the Human Alpha9 Nicotinic Acetylcholine Receptor
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:NEURONAL ACETYLCHOLINE RECEPTOR SUBUNIT ALPHA-9
Gene (Uniprot):CHRNA9
Chain IDs:A
Chain Length:218
Number of Molecules:1
Biological Source:HOMO SAPIENS
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Crystal Structures of Free and Antagonist-Bound States of Human Alpha9 Nicotinic Receptor Extracellular Domain
Nat.Struct.Mol.Biol. 21 976 ? (2014)
PMID: 25282151 DOI: 10.1038/NSMB.2900

Abstact

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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