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Mutation of a highly conserved base in the yeast mitochondrial 21S rRNA restricts ribosomal frameshifting

A mutation shown to cause resistance to chloramphenicol inSaccharomyces cerevisiae was mapped to the central loop in domain V of the yeast mitochondrial 21S rRNA. The mutant 21S rRNA has a base pair exchange from U(2677) (corresponding to U(2504) inEscherichia coli) to C(2677), which significantly r...

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Detalles Bibliográficos
Autores principales: Weiss-Brummer, Brigitte, Zollner, Alfred, Haid, Albert, Thomnson, Shahla
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer-Verlag 1995
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7087996/
https://www.ncbi.nlm.nih.gov/pubmed/7544431
http://dx.doi.org/10.1007/BF02190802
Descripción
Sumario:A mutation shown to cause resistance to chloramphenicol inSaccharomyces cerevisiae was mapped to the central loop in domain V of the yeast mitochondrial 21S rRNA. The mutant 21S rRNA has a base pair exchange from U(2677) (corresponding to U(2504) inEscherichia coli) to C(2677), which significantly reduces rightward frameshifting at a UU UUU UCC A site in a + 1 U mutant. There is evidence to suggest that this reduction also applies to leftward frameshifting at the same site in a − 1 U mutant. The mutation did not increase the rate of misreading of a number of mitochondrial missense, nonsense or frameshift (of both signs) mutations, and did not adversely affect the synthesis of wild-type mitochondrial gene products. It is suggested here that ribosomes bearing either the C(2677) mutation or its wild-type allele may behave identically during normal decoding and only differ at sites where a ribosomal stall, by permitting non-standard decoding, differentially affects the normal interaction of tRNAs with the chloramphenicol resistant domain V. Chloramphenicol-resistant mutations mapping at two other sites in domain V are described. These mutations had no effect on frameshifting.