Kingdom Bacteria Class Alpha Proteobacteria | Phylum Proteobacteria | |
Similar Reclinomonas, Magnetococcus marinus, Midichloria, Jakobid, Pelagibacter ubique | ||
Bluescicon with dr sergio mu oz g mez specialization of the proto mitochondrion 2016 04 20
The proto-mitochondrion is the ancestral bacterial endosymbiont from which all mitochondria are thought to be derived.
Contents
Phylogeny
The phylogenetic analyses of the few genes that are still encoded in the genomes of modern mitochondria suggest an alpha-proteobacterial origin for this endosymbiont. Although the order Rickettsiales has been proposed as the alpha-proteobacterial sister-group of mitochondria, there is no definitive evidence as to from which alpha-proteobacterial group the proto-mitochondrion emerged.
Metabolism
Toni Gabaldón and Martijn Huynen (2003) reconstructed the proteome (the entire set of proteins expressed by a genome) and corresponding metabolism of the proto-mitochondrion by comparing extant alpha-proteobacterial and eukaryotic genomes. They concluded that this organism was an aerobic alpha-proteobacterium catabolyzing lipids, glycerol and other compounds provided by the host. At least 630 gene families derived from this organism can still be found in the 9 eukaryotic genomes analyzed in the study.