title: Arabidopsis genes encoding mitochondrial type II NAD(P)H dehydrogenases have different evolutionary origin and show distinct responses to light.
abstract: In addition to proton-pumping complex I, plant mitochondria contain several type II NAD(P)H dehydrogenases in the electron transport chain. The extra enzymes allow the nonenergy-conserving electron transfer from cytoplasmic and matrix NAD(P)H to ubiquinone. We have investigated the type II NAD(P)H dehydrogenase gene families in Arabidopsis. This model plant contains two and four genes closely related to potato (Solanum tuberosum) genes nda1 and ndb1, respectively. A novel homolog, termed ndc1, with a lower but significant similarity to potato nda1 and ndb1, is also present. All genes are expressed in several organs of the plant. Among the nda genes, expression of nda1, but not nda2, is dependent on light and circadian regulation, suggesting separate roles in photosynthesis-associated and other respiratory NADH oxidation. Genes from all three gene families encode proteins exclusively targeted to mitochondria, as revealed by expression of green fluorescent fusion proteins and by western blotting of fractionated cells. Phylogenetic analysis indicates that ndc1 affiliates with cyanobacterial type II NADH dehydrogenase genes, suggesting that this gene entered the eukaryotic cell via the chloroplast progenitor. The ndc1 should then have been transferred to the nucleus and acquired a signal for mitochondrial targeting of the protein product. Although they are of different origin, the nda, ndb, and ndc genes carry an identical intron position.
authors.affiliation: Department of Cell and Organism Biology, Biology Building, Lund University, Sölvegatan 35B, SE-223 62 Lund, Sweden.
authors.forename: Agnieszka M
authors.initials: AM
authors.lastname: Michalecka
authors.forename: A Staffan
authors.initials: AS
authors.lastname: Svensson
authors.forename: Fredrik I
authors.initials: FI
authors.lastname: Johansson
authors.forename: Stephanie C
authors.initials: SC
authors.lastname: Agius
authors.forename: Urban
authors.initials: U
authors.lastname: Johanson
authors.forename: Axel
authors.initials: A
authors.lastname: Brennicke
authors.forename: Stefan
authors.initials: S
authors.lastname: Binder
authors.forename: Allan G
authors.initials: AG
authors.lastname: Rasmusson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000145:classification / Q000201:enzymology* / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics; D001483:Base Sequence; D017124:Conserved Sequence; D017931:DNA Primers; D019143:Evolution, Molecular; D005091:Exons; D038181:FMN Reductase / Q000737:chemistry / Q000235:genetics*; D015971:Gene Expression Regulation, Enzymologic / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D017343:Genes, Plant; D007438:Introns; D008928:Mitochondria / Q000201:enzymology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D029681:Arabidopsis Proteins; D017931:DNA Primers; D038181:FMN Reductase