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Origin and evolution of the mitochondrial proteome

Kurland, Charles LU and Andersson, S G E (2000) In Microbiology and Molecular Biology Reviews 64(4). p.786-786
Abstract
The endosymbiotic theory for the origin of mitochondria requires substantial modification. The three identifiable ancestral sources to the proteome of mitochondria are proteins descended from the ancestral alpha -proteobacteria symbiont, proteins with no homology to bacterial orthologs, and diverse proteins with bacterial affinities not derived from alpha -proteobacteria. Random mutations in the form of deletions large and small seem to have eliminated nonessential genes from the endosymbiont-mitochondrial genome lineages. This process, together with the transfer of genes from the endosymbiont-mitochondrial genome to nuclei, has led to a marked reduction in the size of mitochondrial genomes. All proteins of bacterial descent that are... (More)
The endosymbiotic theory for the origin of mitochondria requires substantial modification. The three identifiable ancestral sources to the proteome of mitochondria are proteins descended from the ancestral alpha -proteobacteria symbiont, proteins with no homology to bacterial orthologs, and diverse proteins with bacterial affinities not derived from alpha -proteobacteria. Random mutations in the form of deletions large and small seem to have eliminated nonessential genes from the endosymbiont-mitochondrial genome lineages. This process, together with the transfer of genes from the endosymbiont-mitochondrial genome to nuclei, has led to a marked reduction in the size of mitochondrial genomes. All proteins of bacterial descent that are encoded by nuclear genes were probably transferred by the same mechanism, involving the disintegration of mitochondria ol bacteria by the intracellular membranous vacuoles of cells to release nucleic acid fragments that transform the nuclear genome. This ongoing process has intermittently introduced bacterial genes to nuclear. genomes. The genomes of the last common ancestor of all organisms, in particular of mitochondria, encoded cytochrome oxidase homologues. There are no phylogenetic indications either in the mitochondrial proteome ol in the nuclear genomes that the initial or subsequent function of the ancestor to the mitochondria was anaerobic. In contrast there are indications that relatively advanced eukaryotes adapted to anaerobiosis by dismantling their mitochondria and refitting them as hydrogenosomes. Accordingly, a continuous history of aerobic respiration seems to have been the fate of most mitochondrial lineages. The initial phases of this history may have involved aerobic respiration by the symbiont functioning as a scavenger of toxic oxygen. The transition to mitochondria capable of active ATP export to the host cell seems to have required recruitment of eukaryotic ATP transport proteins from the nucleus. The identity of the ancestral host of the alpha -proteobacterial endosymbiont is unclear; but there is no indication that it was an autotroph. There are no indications of a specific alpha -proteobacterial origin to genes for glycolysis. In the absence of data to the contrary it is assumed that the ancestral host cell was a heterotroph. (Less)
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Contribution to journal
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published
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in
Microbiology and Molecular Biology Reviews
volume
64
issue
4
pages
786 - 786
publisher
American Society for Microbiology
external identifiers
  • scopus:0034443285
ISSN
1092-2172
language
English
LU publication?
yes
id
5c432c48-74fb-4ba3-9b20-9150d94b8263 (old id 146974)
alternative location
http://mmbr.asm.org/cgi/reprint/64/4/786
date added to LUP
2007-06-29 11:50:21
date last changed
2017-11-19 03:35:37
@article{5c432c48-74fb-4ba3-9b20-9150d94b8263,
  abstract     = {The endosymbiotic theory for the origin of mitochondria requires substantial modification. The three identifiable ancestral sources to the proteome of mitochondria are proteins descended from the ancestral alpha -proteobacteria symbiont, proteins with no homology to bacterial orthologs, and diverse proteins with bacterial affinities not derived from alpha -proteobacteria. Random mutations in the form of deletions large and small seem to have eliminated nonessential genes from the endosymbiont-mitochondrial genome lineages. This process, together with the transfer of genes from the endosymbiont-mitochondrial genome to nuclei, has led to a marked reduction in the size of mitochondrial genomes. All proteins of bacterial descent that are encoded by nuclear genes were probably transferred by the same mechanism, involving the disintegration of mitochondria ol bacteria by the intracellular membranous vacuoles of cells to release nucleic acid fragments that transform the nuclear genome. This ongoing process has intermittently introduced bacterial genes to nuclear. genomes. The genomes of the last common ancestor of all organisms, in particular of mitochondria, encoded cytochrome oxidase homologues. There are no phylogenetic indications either in the mitochondrial proteome ol in the nuclear genomes that the initial or subsequent function of the ancestor to the mitochondria was anaerobic. In contrast there are indications that relatively advanced eukaryotes adapted to anaerobiosis by dismantling their mitochondria and refitting them as hydrogenosomes. Accordingly, a continuous history of aerobic respiration seems to have been the fate of most mitochondrial lineages. The initial phases of this history may have involved aerobic respiration by the symbiont functioning as a scavenger of toxic oxygen. The transition to mitochondria capable of active ATP export to the host cell seems to have required recruitment of eukaryotic ATP transport proteins from the nucleus. The identity of the ancestral host of the alpha -proteobacterial endosymbiont is unclear; but there is no indication that it was an autotroph. There are no indications of a specific alpha -proteobacterial origin to genes for glycolysis. In the absence of data to the contrary it is assumed that the ancestral host cell was a heterotroph.},
  author       = {Kurland, Charles and Andersson, S G E},
  issn         = {1092-2172},
  language     = {eng},
  number       = {4},
  pages        = {786--786},
  publisher    = {American Society for Microbiology},
  series       = {Microbiology and Molecular Biology Reviews},
  title        = {Origin and evolution of the mitochondrial proteome},
  volume       = {64},
  year         = {2000},
}