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- W54164621 abstract "A nuclear preparation, containing 60-80% of the total tissue DNA and less than 0.5% of the total rRNA, was used to characterize the nuclear RNA species synthesized in cultured artichoke explants. The half-lives of the nuclear RNA species were estimated from first-order-decay analyses to be: hnRNA (heterogeneous nuclear RNA) containing poly(A), 38 min; hnRNA lacking poly(A), 37 min; 2.5 × 10(6)-mol. wt. precursor rRNA, 24 min; 1.4 × 10(6)-mol.wt. precursor rRNA, 58 min; 1.0 × 10(6)-mol.wt. precursor rRNA, 52 min. The shorter half-lives are probably overestimates, owing to the time required for equilibration of the nucleotide-precursor pools. The pathway of rRNA synthesis is considered in terms of these kinetic measurements. The rate of accumulation of cytoplasmic polydisperse RNA suggested that as much as 40% of the hnRNA may be transported to the cytoplasm. The 14-25% of the hnRNA that contained a poly(A) tract had an average molecular size of 0.7 × 10(6) daltons. The poly(A) segment was 40-200 nucleotides long, consisted of at least 95% AMP and accounted for 8-10% of the [32P]orthophosphate incorporated into the poly(A)-containing hnRNA. Ribonucleoprotein particles released from nuclei by sonication, lysis in EDTA or incubation in buffer were analysed by sedimentation through sucrose gradients and by isopycnic centrifugation in gradients of metrizamide and CsCl. More than 50% of the hnRNA remained bound to the chromatin after each treatment. The hnRNA was always associated with protein but the densities of isolated particles suggested that the ratio of protein to RNA was lower than that reported for mammalian cells, The particles separated from chromatin were not enriched for poly(A)-containing hnRNA." @default.
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- W54164621 title "The stability, polyadenylic acid content and ribonucleoprotein form of nulcear ribonucleic acid in artichoke" @default.
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- W54164621 doi "https://doi.org/10.1042/bj1590585" @default.
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