Figure 3

Origin and evolution of the DnaJ-Fer protein. (A) Schematic representation of the tree of life with the three Domains (Archaea, Bacteria and Eucarya) showing the time of the evolutionary events that have affected the DnaJ-Fer protein. (B) Evolutionary scenario for the origin and evolution of the DnaJ-Fer protein: (1) Acquisition of a cyanobacterial Fer domain-containing protein by the ancestor of Archaeplastida/Plantae; (2) translocation of the corresponding gene in the nucleus, fusion with a J domain coding gene and addition of a chloroplast signal peptide; (3) horizontal gene transfer of the DnaJ-Fer coding gene to the ancestor of thaumarchaeota groups I.1a and I.1b and (4) independent replacement of the J domain by J domains of bacterial origin in thaumarchaeotal groups I.1a and I.1b.