Evolution of respiratory complex I: "supernumerary" subunits are present in the alpha-proteobacterial enzyme.

@article{Yip2011EvolutionOR,
  title={Evolution of respiratory complex I: "supernumerary" subunits are present in the alpha-proteobacterial enzyme.},
  author={Chui-ying Yip and Michael E. Harbour and Kamburapola G I Jayawardena and Ian M. Fearnley and Leonid A. Sazanov},
  journal={The Journal of biological chemistry},
  year={2011},
  volume={286 7},
  pages={5023-33}
}
Modern α-proteobacteria are thought to be closely related to the ancient symbiont of eukaryotes, an ancestor of mitochondria. Respiratory complex I from α-proteobacteria and mitochondria is well conserved at the level of the 14 "core" subunits, consistent with that notion. Mitochondrial complex I contains the core subunits, present in all species, and up to… CONTINUE READING