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Sara Chiaberge; Emanuele Cassarino; Giorgio Mangiarotti
The Journal of biological chemistry, 10/1998, Letnik: 273, Številka: 42Journal Article
AC914 mRNA, a pre-spore-specific mRNA that accumulates only in the post-aggregation stage of development, is transcribed constitutively as shown by nuclear run-off experiments and by fusing its promoter to the luciferase reporter gene. The same mRNA disappears quickly from disaggregated cells. If the 5â²-untranslated region (5â²UTR) of the constitutively expressed Actin 15 mRNA is substituted for the 5â²UTR of AC914 mRNA, this can no longer be destabilized and accumulates both in growing and disaggregated cells. If the 5â²UTR of AC914 mRNA is substituted for the 5â²UTR of Actin 15 mRNA, the latter accumulates only in aggregated cells. Pactamycin, but not other inhibitors of protein synthesis, prevents AC914 mRNA from being destabilized in disaggregated cells, suggesting a role of 40âS subunits in the destabilization. This has been confirmed by using an in vitro system in which the in vivo stability of different mRNAs is reproduced. A protein kinase A-dependent phosphorylation of ribosomal protein S6 determines whether 40âS subunits are capable or not of destabilizing AC914 mRNA in the in vitro system.
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