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Related Concept Videos

Leishmaniasis01:30

Leishmaniasis

Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...
Antiprotozoal Agents01:21

Antiprotozoal Agents

Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Related Experiment Video

Updated: Jun 24, 2026

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
08:47

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

Evolutionary changes in the Leishmania eIF4F complex involve variations in the eIF4E-eIF4G interactions.

Yael Yoffe1, Mélissa Léger, Alexandra Zinoviev

  • 1Department of Life Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel.

Nucleic Acids Research
|March 27, 2009
PubMed
Summary
This summary is machine-generated.

Researchers identified a unique interaction between Leishmania eIF4E and eIF4G proteins, crucial for translation initiation. This discovery offers a potential new target for treating Leishmaniasis.

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Area of Science:

  • Molecular Biology
  • Parasitology
  • Drug Discovery

Background:

  • Translation initiation in eukaryotes involves the eIF4F complex binding to the mRNA 5' cap.
  • Leishmania eIF4E proteins differ from higher eukaryotes, binding a unique cap-4 structure.
  • The interaction between eIF4E and eIF4G is essential for eIF4F complex assembly.

Purpose of the Study:

  • To characterize a Leishmania eIF4G candidate (LeishIF4G-3) and its interaction with Leishmania eIF4E.
  • To investigate the structural basis of the Leishmania eIF4E-eIF4G binding motif.
  • To explore the potential of this interaction as a drug target for Leishmaniasis.

Main Methods:

  • Co-elution studies using m(7)GTP-Sepharose chromatography.
  • Direct binding assays between LeishIF4E and LeishIF4G-3.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to confirm interaction and analyze binding motif.

Main Results:

  • LeishIF4G-3 co-eluted with Leishmania eIF4F subunits and directly bound LeishIF4E.
  • A conserved eIF4E-binding peptide was identified in LeishIF4G-3, but with variations from higher eukaryotes.
  • The Leishmania binding motif requires specific residues (Y20, F23, L25) and differs in hydrophobic residue requirements.

Conclusions:

  • The Leishmania eIF4E-eIF4G interaction is structurally distinct from higher eukaryotes.
  • This unique interaction presents a potential novel target for anti-Leishmaniasis drug development.
  • Understanding these differences provides insights for broader drug discovery efforts.