Supramolecular associations between atypical oxidative phosphorylation complexes of Euglena gracilis

H. V Miranda-Astudillo*, Sathish Yadav Kadapalakere, E. J Boekema, P Cardol*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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In vivo associations of respiratory complexes forming higher supramolecular structures are generally accepted nowadays. Supercomplexes (SC) built by complexes I, III and IV and the so-called respirasome (I/III2/IV) have been described in mitochondria from several model organisms (yeasts, mammals and green plants), but information is scarce in other lineages. Here we studied the supramolecular associations between the complexes I, III, IV and V from the secondary photosynthetic flagellate Euglena gracilis with an approach that involves the extraction with several mild detergents followed by native electrophoresis. Despite the presence of atypical subunit composition and additional structural domains described in Euglena complexes I, IV and V, canonical associations into III2/IV, III2/IV2 SCs and I/III2/IV respirasome were observed together with two oligomeric forms of the ATP synthase (V2 and V4). Among them, III2/IV SC could be observed by electron microscopy. The respirasome was further purified by two-step liquid chromatography and showed in-vitro oxygen consumption independent of the addition of external cytochrome c.
Original languageEnglish
Number of pages14
JournalJournal of Bioenergetics and Biomembranes
Early online date1 Mar 2021
Publication statusPublished - 1 Mar 2021


  • Euglena gracilis
  • Oxidative phosphorylation
  • F1FO ATP synthase
  • Oligomeric complex V
  • Mitochondrial supercomplexes
  • Respirasome

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