5BQM

Crystal structure of SXN101959, a Clostridium botulinum neurotoxin type D derivative and targeted secretion inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.250 
  • R-Value Observed: 0.252 

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This is version 1.1 of the entry. See complete history


Literature

Structural analysis of Clostridium botulinum neurotoxin type D as a platform for the development of targeted secretion inhibitors.

Masuyer, G.Davies, J.R.Moore, K.Chaddock, J.A.Ravi Acharya, K.

(2015) Sci Rep 5: 13397-13397

  • DOI: 10.1038/srep13397
  • Primary Citation of Related Structures:  
    5BQM, 5BQN

  • PubMed Abstract: 
  • The botulinum neurotoxin type D is one of seven highly potent toxins produced by Clostridium botulinum which inhibit neurotransmission at cholinergic nerve terminals. A functional fragment derived from the toxin, LHn, consisting of the catalytic and translocation domains, has been heralded as a platform for the development of targeted secretion inhibitors ...

    The botulinum neurotoxin type D is one of seven highly potent toxins produced by Clostridium botulinum which inhibit neurotransmission at cholinergic nerve terminals. A functional fragment derived from the toxin, LHn, consisting of the catalytic and translocation domains, has been heralded as a platform for the development of targeted secretion inhibitors. These secretion inhibitors are aimed at retargeting the toxin towards a specific cell type to inhibit vesicular secretion. Here we report crystal structures of LHn from serotype D at 2.3 Å, and that of SXN101959 at 3.1 Å resolution. SXN101959, a derivative that combines LHn from serotype D with a fragment of the growth hormone releasing hormone, has previously revealed promising results in inhibiting growth hormone release in pituitary somatotrophs. These structures offer for the first time insights into the translocation domain interaction with the catalytic domain in serotype D. Furthermore, structural information from small-angle X-ray scattering of LHn/D is compared among serotypes A, B, and D. Taken together, these results demonstrate the robustness of the 'LHn fold' across serotypes and its use in engineering additional polypeptide components with added functionality. Our study demonstrates the suitability of botulinum neurotoxin, and serotype D in particular, as a basis for engineering novel secretion inhibitors.


    Organizational Affiliation

    Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Botulinum neurotoxin type DA, C453Clostridium botulinumMutation(s): 0 
Gene Names: botD
EC: 3.4.24.69
UniProt
Find proteins for P19321 (Clostridium botulinum D phage)
Explore P19321 
Go to UniProtKB:  P19321
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Somatoliberin,Botulinum neurotoxin type DB, D474Homo sapiensClostridium botulinum
This entity is chimeric
Mutation(s): 0 
Gene Names: GHRHGHRFbotD
EC: 3.4.24.69
UniProt & NIH Common Fund Data Resources
Find proteins for P01286 (Homo sapiens)
Explore P01286 
Go to UniProtKB:  P01286
PHAROS:  P01286
Find proteins for P19321 (Clostridium botulinum D phage)
Explore P19321 
Go to UniProtKB:  P19321
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A], F [auth C]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.250 
  • R-Value Observed: 0.252 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.201α = 90
b = 143.916β = 90
c = 172.762γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PHASERphasing
DIALSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-08-19
    Type: Initial release
  • Version 1.1: 2015-09-09
    Changes: Database references