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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...
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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...
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Protists are diverse eukaryotic microorganisms that lack the specialized tissues of plants and animals and the chitinous cell walls of fungi. Their early divergence within Eukarya resulted in structural, functional, and ecological diversity. They are classified into supergroups such as Archaeplastida, Excavata, Amoebozoa, Rhizaria, Alveolata, and Stramenopiles, determined through genetic analysis and structural similarities.Structural and Functional AdaptationsProtists have various adaptations...
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Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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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...
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Using Fluorescent Proteins to Monitor Glycosome Dynamics in the African Trypanosome
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Protein moonlighting in parasitic protists.

Michael L Ginger1

  • 1*Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster LA1 4YG, U.K.

Biochemical Society Transactions
|November 18, 2014
PubMed
Summary

Parasitic protists exhibit unique biochemistry due to reductive evolution and niche adaptation. This study explores moonlighting proteins in these organisms, highlighting their emerging and controversial roles in parasite biology.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Parasitic protists undergo reductive evolution and gene family expansions, leading to distinct biochemistry compared to hosts.
  • Significant evolutionary distances from model organisms complicate understanding of parasitic protist biochemistry.
  • The phenomenon of moonlighting proteins (proteins with multiple functions) is increasingly recognized in various organisms.

Purpose of the Study:

  • To provide an overview of recently identified moonlighting proteins in parasitic protists.
  • To discuss the controversies surrounding the role of moonlighting proteins in parasite biology.
  • To highlight the unique biochemical adaptations of parasitic protists.

Main Methods:

  • Literature review of recent findings on moonlighting proteins in parasitic protists.

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  • Comparative analysis of parasitic protist biochemistry with other eukaryotes.
  • Discussion of evolutionary pressures shaping parasitic protist genomes and proteomes.

    • Main Results:

    • Several moonlighting proteins have been identified in parasitic protists, suggesting diverse functional roles.
    • The biochemistry of parasitic protists is often divergent, influenced by reductive evolution and niche adaptation.
    • The contribution of moonlighting proteins to parasite biology is an emerging field with ongoing debate.

    Conclusions:

    • Moonlighting proteins represent a significant, albeit controversial, aspect of parasitic protist biology.
    • Understanding these proteins is crucial for deciphering the unique biochemistry and evolutionary adaptations of parasites.
    • Further research is needed to fully elucidate the functions and implications of moonlighting proteins in parasitic organisms.