title: Positive Darwinian selection in the piston that powers proton pumps in complex I of the mitochondria of Pacific salmon.
abstract: The mechanism of oxidative phosphorylation is well understood, but evolution of the proteins involved is not. We combined phylogenetic, genomic, and structural biology analyses to examine the evolution of twelve mitochondrial encoded proteins of closely related, yet phenotypically diverse, Pacific salmon. Two separate analyses identified the same seven positively selected sites in ND5. A strong signal was also detected at three sites of ND2. An energetic coupling analysis revealed several structures in the ND5 protein that may have co-evolved with the selected sites. These data implicate Complex I, specifically the piston arm of ND5 where it connects the proton pumps, as important in the evolution of Pacific salmon. Lastly, the lineage to Chinook experienced rapid evolution at the piston arm.
authors.affiliation: Fisheries Division, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska, United States of America. mrgarvin@alaska.edu
authors.forename: Michael R
authors.initials: MR
authors.lastname: Garvin
authors.forename: Joseph P
authors.initials: JP
authors.lastname: Bielawski
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Gharrett
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry; D000595:Amino Acid Sequence; D000818:Animals; D001499:Bayes Theorem; D005075:Biological Evolution; D019143:Evolution, Molecular; D023281:Genomics; D008928:Mitochondria / Q000378:metabolism*; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D010100:Oxygen / Q000737:chemistry; D010766:Phosphorylation; D010802:Phylogeny; D017494:Proton Pumps / Q000502:physiology*; D012474:Salmon; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D017494:Proton Pumps; D000255:Adenosine Triphosphate; D010100:Oxygen