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- W56749583 abstract "Ferritin synthesis is a dramatic example of mRNA repression: excess iron causes recruitment of ferritin mRNA, increasing synthesis less than or equal to 40 x. Using the iron-storing tadpole red cell as a simple and accessible model, isolated poly(A+) RNA directed the synthesis of ferritin and globin in cell-free extracts from wheat germ (WG); in contrast, ferritin mRNA was specifically repressed (72%) in extracts from rabbit reticulocytes (RR) as it is in vivo. Translatable and hybridizable ferritin mRNA did not enter polysomes of RR in contrast to globin mRNA and to both ferritin and globin mRNA in WG. Single-sequence mRNA, uncapped, was prepared in vitro for both a ferritin M chain and a globin beta chain; both were translated with similar efficiency in RR (164 +/- 66) x 10/sup -3/ and (205 +/- 144) x 10/sup -3/ cpm (/sup 3/H)leucine/h/..mu..g RNA for ferritin and globin, respectively). Ferritin with the expected immunoreactivity and mobility in SDS gel electrophoresis was obtained. The results suggest that ferritin mRNA repression may require a cap or factors present in poly(A+) RNA and that repression can be released in WG but not in RR." @default.
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- W56749583 date "1987-05-01" @default.
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- W56749583 title "Translational control of ferritin synthesis: a study of repression using natural and synthetic mRNAs" @default.
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