Supramolecular Associations Between Atypical Oxidative Phosphorylation Complexes of Euglena Gracilis

Overview

Journal J Bioenerg Biomembr

Publisher Springer

Specialties Biochemistry
Biology
Endocrinology

Date 2021 Mar 1

PMID 33646522

Citations 1

Authors

H V Miranda-Astudillo

K N S Yadav

E J Boekema

P Cardol

Affiliations

Soon will be listed here.

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/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/IV, III/IV SCs and I/III/IV respirasome were observed together with two oligomeric forms of the ATP synthase (V and V). Among them, III/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.

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