5LR0 image
Deposition Date 2016-08-18
Release Date 2017-08-30
Last Version Date 2024-01-10
Entry Detail
PDB ID:
5LR0
Keywords:
Title:
Binding domain of Botulinum Neurotoxin DC in complex with SialylT
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.59 Å
R-Value Free:
0.23
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Botulinum neurotoxin D/C protein
Gene (Uniprot):bont
Chain IDs:A, B
Chain Length:431
Number of Molecules:2
Biological Source:Clostridium botulinum
Ligand Molecules
Primary Citation
Structural basis for the unique ganglioside and cell membrane recognition mechanism of botulinum neurotoxin DC.
Nat Commun 8 1637 1637 (2017)
PMID: 29158482 DOI: 10.1038/s41467-017-01534-z

Abstact

Botulinum neurotoxins (BoNTs), the most potent toxins known, are potential bioterrorism agents. It is well established that all seven serotypes of BoNTs (BoNT/A-G) require complex gangliosides as co-receptors. Here, we report that BoNT/DC, a presumed mosaic toxin between BoNT/D and BoNT/C1, binds and enters efficiently into neurons lacking complex gangliosides and shows no reduction in toxicity in mice deficient in complex gangliosides. The co-crystal structure of BoNT/DC with sialyl-Thomsen-Friedenreich antigen (Sialyl-T) suggests that BoNT/DC recognizes only the sialic acid, but not other moieties in gangliosides. Using liposome flotation assays, we demonstrate that an extended loop in BoNT/DC directly interacts with lipid membranes, and the co-occurring sialic acid binding and loop-membrane interactions mediate the recognition of gangliosides in membranes by BoNT/DC. These findings reveal a unique mechanism for cell membrane recognition and demonstrate that BoNT/DC can use a broad range of sialic acid-containing moieties as co-receptors.

Legend

Protein

Chemical

Disease

Primary Citation of related structures