Energy metabolism of ancestral eukaryotes: a hypothesis based on the biochemistry of amitochondriate parasitic protists - PubMed (original) (raw)
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Energy metabolism of ancestral eukaryotes: a hypothesis based on the biochemistry of amitochondriate parasitic protists
M Müller. Biosystems. 1992.
Abstract
Parasitic amitochondriate protists, representatives of early branches of eukaryote evolution, differ considerably in their central, energy metabolism from mitochondrion-bearing cells. These differences are: significant metabolic functions of inorganic pyrophosphate, major role of iron-sulfur proteins in key metabolic steps and in hydrogenosome-bearing organisms the disposal of electrons by H2 formation. Cytochrome-mediated electron transport and electron transport-linked phosphorylation are absent. All proteins which have been sequenced so far were found to be homologous to isofunctional proteins from other organisms. A few reactions, however, are catabolized by proteins which are not homologous to enzymes performing similar reactions in other eukaryotes. Two significantly different types of metabolism of amitochondriate protists can be distinguished: (a) without compartmentation and (b) with cytosol/hydrogenosome compartmentation. It is likely that these metabolic types have conserved certain traits present in ancestral eukaryotes before mitochondria became established.
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