A new alpha-proteobacterial clade of Bdellovibrio-like predators: implications for the mitochondrial endosymbiotic theory

Environmental Microbiology
Yaacov DavidovEdouard Jurkevitch

Abstract

Bdellovibrio-and-like organisms (BALOs) are peculiar, ubiquitous, small-sized, highly motile Gram-negative bacteria that are obligatory predators of other bacteria. Typically, these predators invade the periplasm of their prey where they grow and replicate. To date, BALOs constitute two highly diverse families affiliated with the delta-proteobacteria class. In this study, Micavibrio spp., a BALO lineage of epibiotic predators, were isolated from soil. These bacteria attach to digest and grow at the expense of other prokaryotes, much like other BALOs. Multiple phylogenetic analyses based on six genes revealed that they formed a deep branch within the alpha-proteobacteria, not affiliated with any of the alpha-proteobacterial orders. The presence of BALOs deep among the alpha-proteobacteria suggests that their peculiar mode of parasitism maybe an ancestral character in this proteobacterial class. The origin of the mitochondrion from an alpha-proteobacterium endosymbiont is strongly supported by molecular phylogenies. Accumulating data suggest that the endosymbiont's host was also a prokaryote. As prokaryotes are unable to phagocytose, the means by which the endosymbiont gained access into its host remains mysterious. We here propo...Continue Reading

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Related Concepts

Bdellovibrio
DNA, Mitochondrial
Biological Evolution
Mitochondria
Phylogeny
Prokaryote
RNA, Ribosomal, 16S
Soil Microbiology
Mutualism
Alphaproteobacteria

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