5HBT

Complex structure of Fab35 and human nAChR alpha1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insights into the molecular mechanisms of myasthenia gravis and their therapeutic implications.

Noridomi, K.Watanabe, G.Hansen, M.N.Han, G.W.Chen, L.

(2017) Elife 6: --

  • DOI: 10.7554/eLife.23043
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The nicotinic acetylcholine receptor (nAChR) is a major target of autoantibodies in myasthenia gravis (MG), an autoimmune disease that causes neuromuscular transmission dysfunction. Despite decades of research, the molecular mechanisms underlying MG ...

    The nicotinic acetylcholine receptor (nAChR) is a major target of autoantibodies in myasthenia gravis (MG), an autoimmune disease that causes neuromuscular transmission dysfunction. Despite decades of research, the molecular mechanisms underlying MG have not been fully elucidated. Here, we present the crystal structure of the nAChR α1 subunit bound by the Fab fragment of mAb35, a reference monoclonal antibody that causes experimental MG and competes with ~65% of antibodies from MG patients. Our structures reveal for the first time the detailed molecular interactions between MG antibodies and a core region on nAChR α1. These structures suggest a major nAChR-binding mechanism shared by a large number of MG antibodies and the possibility to treat MG by blocking this binding mechanism. Structure-based modeling also provides insights into antibody-mediated nAChR cross-linking known to cause receptor degradation. Our studies establish a structural basis for further mechanistic studies and therapeutic development of MG.


    Organizational Affiliation

    Department of Chemistry, University of Southern California, Los Angeles, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acetylcholine receptor subunit alpha 1
B
212Homo sapiensMutation(s): 3 
Gene Names: CHRNA1 (ACHRA, CHNRA)
Find proteins for P02708 (Homo sapiens)
Go to Gene View: CHRNA1
Go to UniProtKB:  P02708
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab35, Light Chain
C
213N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fab35, Heavy Chain
D
219N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Alpha-bungarotoxin isoform V31
A
74Bungarus multicinctusMutation(s): 0 
Find proteins for P60616 (Bungarus multicinctus)
Go to UniProtKB:  P60616
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
B
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
BMA
Query on BMA

Download SDF File 
Download CCD File 
B
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.207 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 160.006α = 90.00
b = 42.143β = 117.05
c = 136.488γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PDB_EXTRACTdata extraction
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-05-03
    Type: Initial release
  • Version 1.1: 2017-05-10
    Type: Database references