Fig. 4

Distribution of selected mitochondrial components (proteins, non-coding RNA) in eukaryotes. The schematic tree was drawn as a consensus of recent phylogenomic analyses [28, 85,86,87,88]; the position of Metamonada remains unresolved (possible affinities indicated by dashed lines). RecA sequence IDs are provided in Additional file 4: Table S3 (A), details on tmRNA and SmpB sequences are listed in Additional file 4: Table S3 (B). “Novel aminotransferase” corresponds to a member of the DegT/DnrJ/EryC1/StrS family patchily distributed in a few eukaryotes (see text and Additional file 5: Figure S2). The three proteins constituting the aerobic-type rubrerythrin system (aer. rubrerythrin, DUF3501, RFO) exhibit a highly coherent distribution, with the latter two proteins found only in species that encode an aerobic-type rubrerythrin (see Additional file 4: Table S3 (C) for a detailed view)