2021/03/01 by Héctor Miranda‐Astudillo, H. V. Miranda-Astudillo, Kanchan Yadav +5
Biochemistry, Genetics and Molecular Biology · #ATP Synthase and ATPases Research #Mitochondrial Function and Pathology #Photosynthetic Processes and Mechanisms
paper · pdf · doi:10.1007/s10863-021-09882-8
openalex publication_date 2021/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Abstract 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/III 2 /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 III 2 /IV, III 2 /IV 2 SCs and I/III 2 /IV respirasome were observed together with two oligomeric forms of the ATP synthase (V 2 and V 4 ). Among them, III 2 /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 .