title: Complex II subunit 4 (sdh4) homologous sequences in plant mitochondrial genomes.
abstract: Through cDNA analysis a 95-codons-long novel open reading frame (orf) is identified in the Arabidopsis thaliana mitochondrial genome, overlapping the 3'-end region of the cox3 gene. This sequence is conserved in other dicot plants such as Oenothera, pea and sunflower, but is not detected in wheat mitochondrial DNA. The Arabidopsis, sunflower and Oenothera sequences may be pseudogenes, with the first two being shortened by stop codons and transcription of the latter terminating within the orf. However, RNA editing increases the similarity to homologous Marchantia, algal and bacterial polypeptides, suggesting that this orf could code for the complex-II membrane-anchor subunit (SDH4) in at least some higher-plant species.
authors.affiliation: Allgemeine Botanik, Universität Ulm, Albert-Einstein-Allee, D-89069 Ulm, Germany. philippe.giege@biologie.uni-ulm.de
authors.forename: P
authors.initials: P
authors.lastname: Giegé
authors.forename: V
authors.initials: V
authors.lastname: Knoop
authors.forename: A
authors.initials: A
authors.lastname: Brennicke
mesh_terms: D000595:Amino Acid Sequence; D029681:Arabidopsis Proteins; D003001:Cloning, Molecular; D004272:DNA, Mitochondrial / Q000235:genetics; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics*; D008928:Mitochondria / Q000235:genetics*; D008969:Molecular Sequence Data; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry / Q000235:genetics*; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D017393:RNA Editing / Q000235:genetics; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
chemical_list: D029681:Arabidopsis Proteins; D004272:DNA, Mitochondrial; D008565:Membrane Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D010940:Plant Proteins; C116479:SDH4 protein, Arabidopsis