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Mechanism of an animal toxin-antidote system

Lews Caro1,2, Aguan D Wei3, Christopher A Thomas4

  • 1Molecular and Cellular Biology Ph.D. Program, University of Washington; Seattle, WA 98195, USA.

Biorxiv : the Preprint Server for Biology
|June 25, 2024
PubMed

Insights

The PEEL-1 toxin in C. elegans requires PMPL-1 to kill cells. Together, these proteins form a cation channel, causing cell swelling and death.

Area of Science:

  • Molecular biology
  • Cell biology
  • Genetics

Background:

  • Toxin-antidote systems are selfish genetic elements.
  • The *peel-1 zeel-1* system in *C. elegans* involves the toxin PEEL-1, which kills cells autonomously.

Purpose of the Study:

  • To investigate the molecular mechanism of PEEL-1 toxicity.
  • To identify factors required for PEEL-1-mediated cell death.

Main Methods:

  • Investigated PEEL-1 toxicity in *C. elegans*.
  • Co-expressed PEEL-1 and PMPL-1 in HEK293T cells.
  • Performed electrophysiology on purified PEEL-1 and PMPL-1 proteins reconstituted into lipid bilayers.

Main Results:

  • PEEL-1 toxicity is dependent on the small membrane protein PMPL-1.
  • Co-expression of PEEL-1 and PMPL-1 in HEK293T cells induced cell swelling and increased permeability.
  • Purified PEEL-1 and PMPL-1 formed ion channels in lipid bilayers, allowing cation flux.

Conclusions:

  • PEEL-1 kills cells by interacting with PMPL-1 to form a functional cation channel.
  • This channel activity leads to cell swelling and death, characteristic of PEEL-1 toxicity.

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