Related Experiment Video

Updated: Oct 19, 2026

Analysis of the Epithelial Damage Produced by Entamoeba histolytica Infection
11:49

Analysis of the Epithelial Damage Produced by Entamoeba histolytica Infection

Published on: June 12, 2014

Pore-forming peptides of Entamoeba dispar. Similarity and divergence to amoebapores in structure, expression and

R Nickel1, C Ott, T Dandekar

  • 1Bernard Nocht Institute for Tropical Medicine, Hamburg, Germany.

European Journal of Biochemistry
|October 16, 1999
PubMed

Insights

Novel amoebapore homologs were identified in Entamoeba dispar, revealing differences in peptide structure, abundance, and pore-forming activity compared to Entamoeba histolytica, potentially explaining pathogenicity variations.

Area of Science:

  • Molecular biology
  • Parasitology
  • Biochemistry

Background:

  • Amoebapore, a pore-forming peptide from Entamoeba histolytica, is crucial for pathogenicity.
  • Previous studies identified amoebapore isoforms in E. histolytica and one homolog in Entamoeba dispar.

Purpose of the Study:

  • To identify and characterize novel amoebapore homologs in Entamoeba dispar.
  • To investigate potential structural and functional differences between amoebapores from E. histolytica and E. dispar.

Main Methods:

  • Molecular cloning to identify novel amoebapore homologs.
  • Molecular modeling to predict peptide structure variations.
  • Peptide isolation from trophozoite extracts for functional assays.

Main Results:

  • Two novel amoebapore homologs were identified in E. dispar.
  • Molecular modeling indicated species-specific structural variations despite primary sequence similarity.
  • E. dispar exhibited lower amounts of pore-forming peptides and reduced lytic activity compared to E. histolytica.

Conclusions:

  • Differences in amoebapore abundance and activity between E. histolytica and E. dispar may contribute to variations in pathogenicity.
  • Further research into these lytic polypeptides is warranted to understand their role in amoebic infections.

More Related Videos

Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization10:13

Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization

Published on: August 11, 2018

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep105011:27

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050

Published on: May 13, 2020

Related Concept Videos

Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Amebiasis01:28

Amebiasis

Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...
Structure of Porins01:21

Structure of Porins

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 precursors...
Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...