Mantamonas mitogenome data

Here, we provide data about the mitogenome of <i>Mantamonas sphyraenae</i>, a protist from the deep-branching CRuMs supergroup. It contains 91 genes, including 62 protein-coding ones. These include rare homologs of the four subunits of the bacterial-type cytochrome c maturation system I (CcmA, CcmB, CcmC, and CcmF), alongside a unique ribosomal protein S6. In addition to the universally found eukaryotic mitochondrial protein import systems, the <i>Mantamonas</i> mitogenome encodes SecY (also found in jakobids) as well as SecA, SecE, and SecG, making it the sole eukaryote known to house a complete mitochondrial Sec translocation system. Phylogenetic and comparative genomic analyses provide compelling evidence for the alphaproteobacterial origin of this system, establishing its presence in the last eukaryotic common ancestor.