Translational readthrough of a termination codon in the yeast mitochondrial mRNA VAR1 as a result of mutation in the release factor mRF1.
Yeast mitochondrial DNA codes for eight major polypeptides. Translation of he mitochondrially encoded polypeptides in strains with mutated mitochondrial release factor, mRF1, was found to result in the synthesis of a novel protein, V2. Different mrf1 alleles were associated with different efficiency of V2p synthesis. Translation of V2p was enhanced by paromomycin. Comparative analysis of peptides resulting from protease digestion indicated that V2p is a derivative of Var1p. According to our hypothesis, V2p represents a readthrough product of the natural stop codon in VAR1 mRNA.
Claisse
Maurice L
ML
Centre de Génétique Moléculaire, Laboratoire Propre 2167 du CNRS Associé à l'Université Pierre et Marie Curie, Paris, Cedex, France.
Boguta
Magdalena
M
Zagórski
Włodzimierz
W
D018388:Codon, Terminator; D005656:Fungal Proteins / Q000235:genetics*; D008565:Membrane Proteins / Q000235:genetics*; D008928:Mitochondria / Q000235:genetics*; D024101:Mitochondrial Proteins; D009154:Mutation; D010303:Paromomycin / Q000494:pharmacology; D014176:Protein Biosynthesis; D012269:Ribosomal Proteins / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics*
D018388:Codon, Terminator; D005656:Fungal Proteins; D008565:Membrane Proteins; D024101:Mitochondrial Proteins; D012269:Ribosomal Proteins; D029701:Saccharomyces cerevisiae Proteins; C026383:VAR1 protein, S cerevisiae; D010303:Paromomycin