Crystal structures of botulinum neurotoxin subtypes A4 and A5 cell binding domains in complex with receptor ganglioside

Research output: Contribution to journalArticlepeer-review

Abstract

Botulinum neurotoxins (BoNT) cause the potentially fatal neuroparalytic disease botulism that arises due to proteolysis of a SNARE protein. Each BoNT is comprised of three domains: a cell binding domain (HC), a translocation domain (HN), and a catalytic (Zn2+ endopeptidase) domain (LC). The HC is responsible for neuronal specificity by targeting both a protein and ganglioside receptor at the neuromuscular junction. Although highly toxic, some BoNTs are commercially available as therapeutics for the treatment of a range of neuromuscular conditions. Here we present the crystal structures of two BoNT cell binding domains, HC/A4 and HC/A5, in a complex with the oligosaccharide of ganglioside, GD1a and GM1b, respectively. These structures, along with a detailed comparison with the previously reported apo-structures, reveal the conformational changes that occur upon ganglioside binding and the interactions involved.
Original languageEnglish
Article number129
JournalToxins
Volume14
Issue number2
DOIs
Publication statusPublished - 8 Feb 2022

Keywords

  • Botulinum neurotoxin
  • Cell binding domain
  • Crystal structure
  • Ganglioside binding
  • Subtypes A4 and A5

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis

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