5MK6

Crystal structure of the receptor-binding domain of botulinum neurotoxin A1 (crystal form 1)

• PDB DOI: https://doi.org/10.2210/pdb5MK6/pdb

• Classification: TOXIN
• Organism(s): Clostridium botulinum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2016-12-02 Released: 2018-03-28 
• Deposition Author(s): Davies, J.R., Acharya, K.R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.221 
• R-Value Work: 0.176 
• R-Value Observed: 0.178 

Literature

High resolution crystal structures of the receptor-binding domain ofClostridium botulinumneurotoxin serotypes A and FA.

Davies, J.R., Hackett, G.S., Liu, S.M., Acharya, K.R.

(2018) PeerJ 6: e4552-e4552

• PubMed: 29576992 
• DOI: https://doi.org/10.7717/peerj.4552
• Primary Citation of Related Structures:  
  5MK6, 5MK7, 5MK8


• PubMed Abstract: 
  

  The binding specificity of botulinum neurotoxins (BoNTs) is primarily a consequence of their ability to bind to multiple receptors at the same time. BoNTs consist of three distinct domains, a metalloprotease light chain (LC), a translocation domain (H _N ) and a receptor-binding domain (H _C ). Here we report the crystal structure of H _C /FA, complementing an existing structure through the modelling of a previously unresolved loop which is important for receptor-binding. Our H _C /FA structure also contains a previously unidentified disulphide bond, which we have also observed in one of two crystal forms of H _C /A1. This may have implications for receptor-binding and future recombinant toxin production.

---

Organizational Affiliation: 

Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 50.73 kDa 
• Atom Count: 3,933 
• Modelled Residue Count: 421 
• Deposited Residue Count: 433 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Botulinum neurotoxin type A	A	433	Clostridium botulinum	Mutation(s): 0  Gene Names: botA, atx, bna EC: 3.4.24.69
UniProt
Find proteins for P0DPI1 (Clostridium botulinum (strain Hall / ATCC 3502 / NCTC 13319 / Type A)) Explore P0DPI1  Go to UniProtKB:  P0DPI1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NA	B [auth A]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.221 
• R-Value Work: 0.176 
• R-Value Observed: 0.178 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 39.77	α = 90
b = 107.32	β = 90
c = 107.6	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
DIALS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2018-03-28 
Deposition Author(s): Davies, J.R., Acharya, K.R.

Revision History  

• Version 1.0: 2018-03-28
  Type: Initial release
  
• Version 1.1: 2018-04-04
  Changes: Data collection, Database references
• Version 1.2: 2024-05-08
  Changes: Data collection, Database references