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. 1975 Nov;72(11):4293–4297. doi: 10.1073/pnas.72.11.4293

Translation of RNA that contains polyadenylate from yeast mitochondria in an Escherichia coli ribosomal system.

G Padmanaban, F Hendler, J Patzer, R Ryan, M Rabinowitz
PMCID: PMC388707  PMID: 172902

Abstract

RNA that contains poly(A) [poly(A)-RNA] has been isolated from yeast mitochondria by poly(U) Sepharose-4B column chromatography. Pulse-labeled poly(A)-RNA shows 8-10 discrete peaks by acrylamide gel electrophoresis. The specific activity of mitochondrial poly(A)-RAN is six to eight times greater than that of mitochondrial rRNA after pulse labeling of protoplasts with [3H-]uridine. Ethidium bromide inhibits incorporation by over 90%. The total mitochondrial RNA preparation was contaminated with 5-15% cytoplasmic rRNA as determined by gel electrophoresis, but RNA exhaustion hybridization experiments indicated little or no cytoplasmic contamination of the mitochondrial poly(A)-RNA. The poly(A)-RNA stimulates [3H]leucine incorporation into protein in an E. coli cell-free system. A fraction of the labeled product is precipitated with antibody directed toward yeast cytochrome oxidase, but not with antibody directed toward bovine serum albumin. Sodium dodecyl sulfate gel electrophoresis of the immunoprecipitated material reveals labeled peptides having the mobility of the three larger cytochrome oxidase peptides, which are known to be translated by mitochondrial ribosomes.

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Selected References

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