title: Schizosaccharomyces pombe possesses two paralogous valyl-tRNA synthetase genes of mitochondrial origin.
abstract: Previous studies showed that VAS1 of Saccharomyces cerevisiae encodes both cytosolic and mitochondrial forms of valyl-tRNA synthetase (ValRS) through alternative initiation of translation. We show herein that except for Schizosaccharomyces pombe, all yeast species studied contained a single ValRS gene encoding both forms, and all of the mature protein forms deduced from those genes possessed an N-terminal appended domain (Ad) that was absent from their bacterial relatives. In contrast, S. pombe contained two distinct nuclear ValRS genes, one encoding the mitochondrial form and the other its cytosolic counterpart. Although the cytosolic form closely resembles other yeast ValRS sequences (approximately 60% identity), the mitochondrial form exhibits significant divergence from others (approximately 35% identity). Both genes are active and essential for the survival of the yeast. Most conspicuously, the mitochondrial form lacks the characteristic Ad. A phylogenetic analysis further suggested that both forms of S. pombe ValRS are of mitochondrial origin, and the mitochondrial form is ancestral to the cytoplasmic form.
authors.affiliation: Department of Life Science, National Central University, Jung-li, Taiwan.
authors.forename: Wen-Chih
authors.initials: WC
authors.lastname: Chiu
authors.forename: Chia-Pei
authors.initials: CP
authors.lastname: Chang
authors.forename: Wei-Ling
authors.initials: WL
authors.lastname: Wen
authors.forename: Shao-Win
authors.initials: SW
authors.lastname: Wang
authors.forename: Chien-Chia
authors.initials: CC
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D049148:Aminoacylation; D003593:Cytoplasm / Q000378:metabolism; D055786:Gene Knockout Techniques; D020043:Genes, Essential; D005800:Genes, Fungal; D005816:Genetic Complementation Test; D006651:Histocytochemistry; D008856:Microscopy, Fluorescence; D008928:Mitochondria / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D012568:Schizosaccharomyces / Q000166:cytology / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D014637:Valine-tRNA Ligase / Q000235:genetics* / Q000378:metabolism
chemical_list: D014637:Valine-tRNA Ligase