The rpl5-rps14-cob gene arrangement in Solanum tuberosum: rps14 is a transcribed and unedited pseudogene.
The L5 ribosomal protein gene (rpl5) and a S14 ribosomal protein pseudogene were identified by sequence analysis in the potato mitochondrial genome. The two genes are separated by one nucleotide and are found upstream of the apocytochrome b gene (cob), an arrangement conserved also in Arabidopsis and Brassica. The rpl5 gene has an intact open reading frame while the rps14 locus is disrupted by a five nucleotide duplication that introduces a frameshift in the reading frame. Editing of rpl5 and pseudorps14 cotranscripts has been studied by cDNA sequence analysis. Eight C residues are edited into U in the rpl5 coding region, resulting in eight amino acid changes that increase the homology between potato and other RPL5 polypeptides. Interestingly, the rps14 pseudogene sequence is not edited at any nucleotide position.
Quiñones
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Departmento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile.
Zanlungo
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S
Moenne
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A
Gómez
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I
Holuigue
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L
Litvak
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S
Jordana
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X
D000595:Amino Acid Sequence; D001059:Apoproteins / Q000235:genetics; D001483:Base Sequence; D003573:Cytochrome b Group / Q000235:genetics; D045303:Cytochromes b; D004272:DNA, Mitochondrial / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D017343:Genes, Plant / Q000235:genetics*; D008928:Mitochondria; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D011544:Pseudogenes / Q000235:genetics*; D012313:RNA / Q000032:analysis; D017393:RNA Editing / Q000502:physiology; D000077278:RNA, Mitochondrial; D018749:RNA, Plant / Q000032:analysis; D015183:Restriction Mapping; D012269:Ribosomal Proteins / Q000235:genetics*; D017422:Sequence Analysis, DNA; D011198:Solanum tuberosum / Q000235:genetics*
D001059:Apoproteins; D003573:Cytochrome b Group; D004272:DNA, Mitochondrial; D018744:DNA, Plant; D000077278:RNA, Mitochondrial; D018749:RNA, Plant; D012269:Ribosomal Proteins; C029742:ribosomal protein L5; C039747:ribosomal protein S14; D012313:RNA; D045303:Cytochromes b