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Crystallographic evidence for doxorubicin binding to the receptor-binding site in Clostridium botulinum neurotoxin B

S Eswaramoorthy1, D Kumaran, S Swaminathan

  • 1Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

Acta Crystallographica. Section D, Biological Crystallography
|October 27, 2001
PubMed

Insights

Researchers found that doxorubicin binds to botulinum neurotoxin B at its ganglioside-binding site. This discovery offers a potential pathway for designing new drugs to block neurotoxin activity.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Structural Biology

Background:

  • Clostridium botulinum and tetanus neurotoxins target gangliosides for neuronal cell entry.
  • Developing competitive inhibitors is crucial to prevent neurotoxin activity.

Purpose of the Study:

  • To investigate potential drug candidates that can bind to the ganglioside-binding site of botulinum neurotoxin B (BoNT/B).
  • To explore the structural basis for drug-neurotoxin interactions for antagonist design.

Main Methods:

  • X-ray crystallography was used to determine the structure of the BoNT/B-doxorubicin complex.
  • Analysis of molecular interactions between doxorubicin and the BoNT/B binding domain.

Main Results:

  • Doxorubicin, a DNA intercalator, was found to bind to the proposed ganglioside-binding site of BoNT/B.
  • Structural analysis revealed doxorubicin's interactions with key residues (Trp1261, His1240) within the neurotoxin's binding domain, similar to sialyllactose.
  • The binding mode suggests doxorubicin can compete with gangliosides.

Conclusions:

  • The crystallographic analysis of the BoNT/B-doxorubicin complex provides a structural basis for designing novel neurotoxin antagonists.
  • Doxorubicin serves as a lead compound for developing therapeutic agents against botulinum neurotoxin B.

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