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A Uniquely Complex Mitochondrial Proteome from Euglena gracilis.

Michael J Hammond1, Anna Nenarokova1,2, Anzhelika Butenko1,3

  • 1Biology Centre, Institute of Parasitology, Czech Academy of Sciences, České Budějovice, Budweis, Czech Republic.

Molecular Biology and Evolution
|March 12, 2020
PubMed
Summary
This summary is machine-generated.

Euglena gracilis mitochondria possess a large proteome but lack RNA editing machinery found in related parasites. This suggests complex mitochondrial gene expression evolved independently in different Euglenozoa lineages.

Keywords:
Euglena gracilisEuglenozoamitochondriaproteomeprotist

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Area of Science:

  • Mitochondrial biology
  • Evolutionary biology
  • Protistology

Background:

  • Euglena gracilis is a versatile free-living protist with significant environmental and biotechnological relevance.
  • Mitochondria are crucial organelles, and understanding their proteomes provides insights into cellular function and evolution.

Purpose of the Study:

  • To characterize the mitochondrial proteome of Euglena gracilis.
  • To investigate the evolutionary history of mitochondrial gene expression and metabolic pathways in Euglenozoa.

Main Methods:

  • Label-free liquid chromatography tandem mass spectrometry was used to identify proteins in purified Euglena gracilis mitochondria.
  • Comparative analysis of the Euglena gracilis mitoproteome with the transcriptome of Eutreptiella gymnastica.

Main Results:

  • A total of 1,786 mitochondrial proteins were identified in Euglena gracilis, one of the largest reported mitochondrial proteomes.
  • Euglena gracilis mitochondria lack the RNA editing, splicing, and processing machinery characteristic of diplonemids and kinetoplastids.
  • Presence of the alternative oxidase pathway and ribosomal subunits typically found in parasitic trypanosomes was noted.
  • Conserved and unique features of Euglenida mitochondria were identified through comparison with Eutreptiella gymnastica.

Conclusions:

  • The absence of complex RNA editing machinery suggests its late and independent evolution within Euglenozoa.
  • Euglena gracilis mitochondria exhibit early complexity, independent of parasitic adaptations.
  • This study provides the first mitochondrial proteome for a free-living Excavata protist, offering novel perspectives on mitochondrial evolution.