title: Cloning and characterization of nuclear genes for two mitochondrial ribosomal proteins in Saccharomyces cerevisiae.
abstract: The genes for two large subunit proteins, YmL8 and YmL20, of the mitochondrial ribosome of Saccharomyces cerevisiae were cloned by hybridization with synthetic oligonucleotide mixtures corresponding to their N-terminal amino acid sequences. They were termed MRP-L8 and MRP-L20, respectively, and their nucleotide sequences were determined using a DNA sequencer. The MRP-L8 gene was found to encode a 26.8-kDa protein whose deduced amino acid sequence has a high degree of similarity to ribosomal protein L17 of Escherichia coli. The gene MRP-L20 was found to encode a 22.3-kDa protein with a presequence consisting of 18 amino acid residues. By Southern blot hybridization to the yeast chromosomes separated by field-inversion gel electrophoresis, the MRP-L8 and MRP-L20 genes were located on chromosomes X and XI, respectively. Gene disruption experiments indicate that their products, YmL8 and YmL20 proteins, are essential for the mitochondrial function and the absence of these proteins causes instability of the mitochondrial DNA.
authors.affiliation: Department of Biology, Faculty of Science, Kobe University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kitakawa
authors.forename: L
authors.initials: L
authors.lastname: Grohmann
authors.forename: H R
authors.initials: HR
authors.lastname: Graack
authors.forename: K
authors.initials: K
authors.lastname: Isono
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism; D015825:Chromosomes, Fungal; D003001:Cloning, Molecular; D004272:DNA, Mitochondrial / Q000235:genetics*; D005800:Genes, Fungal; D008928:Mitochondria / Q000378:metabolism*; D008969:Molecular Sequence Data; D015183:Restriction Mapping; D012269:Ribosomal Proteins / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004272:DNA, Mitochondrial; D012269:Ribosomal Proteins