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Mitochondria exist on a functional and evolutionary continuum that includes anaerobic mitochondrion-related organelles (MROs), such as hydrogenosomes. Hydrogenosomes lack many classical mitochondrial features, including conspicuous cristae, mtDNA, the tricarboxylic acid (TCA) cycle, and ATP synthesis powered by an electron transport chain (ETC); instead, they produce ATP anaerobically, liberating...
The mitochondria have arisen as a consequence of endosymbiosis of an ancestral α-proteobacterium with a methane-producing archae. The main function of the canonical aerobic mitochondria include ATP generation via oxidative phosphorylation, heme and phospholipid synthesis, calcium homeostasis, programmed cell death, and the formation of iron–sulfur clusters. Under oxygen-restricted conditions, the...
Hydrogenosomes are double membrane bounded redox organelles found in a number of amitochondriate protists and fungi. They are involved in carbohydrate metabolism and ATP synthesis and thus resemble mitochondria. Molecular analysis of the hydrogenosomal heat shock proteins Hsp70, Hsp60 and Hsp10 in Trichomonas vaginalis, one of the deepest-branching eukaryotes known to date, has revealed that these...
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