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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Deciphering the Molecular Mechanism and Function of Pore-Forming Toxins Using Leishmania major
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Deciphering the Molecular Mechanism and Function of Pore-Forming Toxins Using Leishmania major

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Apicomplexan Pore-Forming Toxins.

Vern B Carruthers1

  • 1Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA;

Annual Review of Microbiology
|August 1, 2024
PubMed
Summary
This summary is machine-generated.

Pore-forming toxins (PFTs) are crucial for host defense and pathogen invasion. This review explores how parasite PFTs facilitate infection, regulate their function, and avoid self-harm, highlighting open questions in parasitic disease research.

Keywords:
cell traversalegresshelminthsperforin-like proteinsprotozoasaposin-like proteins

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Area of Science:

  • Molecular Biology
  • Parasitology
  • Immunology

Background:

  • Pore-forming toxins (PFTs) are effector molecules used by both hosts and pathogens.
  • Hosts utilize PFTs for defense against infections and cancer.
  • Pathogens, including bacteria, parasites, and protozoa, deploy PFTs to establish and promote infections.

Purpose of the Study:

  • To review advances in understanding parasite PFTs.
  • To elucidate mechanisms by which parasite PFTs promote infection.
  • To describe the regulation of parasite PFTs and their role in host-pathogen interactions.

Main Methods:

  • Literature review of seminal and recent research on PFTs in parasitic infections.
  • Analysis of PFT mechanisms, including pore formation and cellular egress.
  • Discussion of regulatory mechanisms controlling PFT activity in parasites.

Main Results:

  • Apicomplexan parasites use perforin-like PFTs for cell egress and tissue invasion.
  • Protozoa and helminths employ saposin-like PFTs for nutrient acquisition.
  • Parasite PFTs are regulated to perform functions without causing self-harm.

Conclusions:

  • Parasite PFTs are key virulence factors essential for parasitic infection.
  • Understanding PFT regulation and function offers potential therapeutic targets.
  • Further research is needed to fully elucidate the complexities of parasite PFTs in disease.