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Updated: Apr 27, 2026

Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons
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Tetanus neurotoxin utilizes two sequential membrane interactions for channel formation.

Joshua R Burns1, Michael R Baldwin2

  • 1From the Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri 65212.

The Journal of Biological Chemistry
|June 29, 2014
PubMed
Summary
This summary is machine-generated.

Tetanus neurotoxin (TeNT) uses acidic lipids and low pH to form channels in endosomal membranes. Ganglioside co-receptors help tether TeNT, facilitating its translocation mechanism for causing neuroparalytic disease.

Keywords:
Bacterial ToxinEndosomal pH FunctionGangliosideMembrane LipidTetanus ToxinTranslocase Channels

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Biochemistry

Background:

  • Tetanus neurotoxin (TeNT) causes neuroparalytic disease by inhibiting neurotransmitter release.
  • The mechanism of TeNT translocation across endosomal membranes is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism of TeNT translocation across endosomal membranes.
  • To investigate the role of membrane composition and pH in TeNT channel formation.

Main Methods:

  • Studied TeNT and a truncated mutant (TeNT-LHN) interaction with lipid membranes.
  • Investigated pH-dependent membrane association and channel formation.
  • Examined the role of ganglioside co-receptors in TeNT membrane tethering.

Main Results:

  • TeNT and TeNT-LHN associate with acidic phospholipid-rich membranes in a pH-dependent manner.
  • Membrane interface and bilayer composition modulate TeNT's membrane-competent state.
  • Ganglioside co-receptors enhance TeNT channel formation by tethering it to the membrane before acidification.
  • TeNT channel formation involves sequential steps: receptor binding domain interaction and low pH-driven conformational changes.

Conclusions:

  • TeNT channel formation is a two-step process initiated by receptor binding and completed by low pH-induced conformational changes.
  • Acidic lipids and low pH are critical for TeNT translocation across endosomal membranes.
  • Understanding TeNT's mechanism provides insights into neurotoxin action and potential therapeutic targets.