In vertebrates, the mRNAs encoding ribosomal proteins, as well as other proteins implicated in translation, are characterized by a 5' -untranslated region (5'-UTR), including a stretch of pyrimidines at the 5'-end. The 5'-terminal oligopyrimidine (5'-TOP) sequence, which is involved in the growth-dependent translational regulation characteristic of this class of genes (so-called TOP genes), has been shown to specifically bind the La protein in vitro, suggesting that La might be implicated in translational regulation in vivo. In order to substantiate this hypothesis, we have examined the effect of La on TOP mRNA translational control in both stable and transient transfection experiments. In particular we have constructed and analyzed three stably transfected Xenopus cell lines inducible for overexpression of wild-type La or of putative dominant negative mutated forms. Moreover, La-expressing plasmids have been transiently co-transfected together with a plasmid expressing a reporter TOP mRNA in a human cell line. Our results suggest that in vivo La protein plays a positive role in the translation of TOP mRNA. They also suggest that the function of La is to counteract translational repression exerted by a negative factor, possibly cellular nucleic acid binding protein (CNBP), which has been previously shown to bind the 5'-UTR downstream from the 5'-TOP sequence.

Crosio, C., Boyl, P.P., Loreni, F., Pierandrei-Amaldi, P., & Amaldi, F. (2000). La protein has a positive effect on the translation of TOP mRNAs in vivo. NUCLEIC ACIDS RESEARCH, 28(15), 2927-2934 [10.1093/nar/28.15.2927].

La protein has a positive effect on the translation of TOP mRNAs in vivo

LORENI, FABRIZIO;AMALDI, FRANCESCO
2000

Abstract

In vertebrates, the mRNAs encoding ribosomal proteins, as well as other proteins implicated in translation, are characterized by a 5' -untranslated region (5'-UTR), including a stretch of pyrimidines at the 5'-end. The 5'-terminal oligopyrimidine (5'-TOP) sequence, which is involved in the growth-dependent translational regulation characteristic of this class of genes (so-called TOP genes), has been shown to specifically bind the La protein in vitro, suggesting that La might be implicated in translational regulation in vivo. In order to substantiate this hypothesis, we have examined the effect of La on TOP mRNA translational control in both stable and transient transfection experiments. In particular we have constructed and analyzed three stably transfected Xenopus cell lines inducible for overexpression of wild-type La or of putative dominant negative mutated forms. Moreover, La-expressing plasmids have been transiently co-transfected together with a plasmid expressing a reporter TOP mRNA in a human cell line. Our results suggest that in vivo La protein plays a positive role in the translation of TOP mRNA. They also suggest that the function of La is to counteract translational repression exerted by a negative factor, possibly cellular nucleic acid binding protein (CNBP), which has been previously shown to bind the 5'-UTR downstream from the 5'-TOP sequence.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore BIO/11
eng
Con Impact Factor ISI
messenger RNA; nucleic acid binding protein; oligonucleotide; pyrimidine; ribosome protein; 5' untranslated region; amino acid sequence; animal cell; article; cell strain; controlled study; gene expression regulation; genetic transfection; human; human cell; nonhuman; plasmid; priority journal; protein expression; protein processing; protein RNA binding; reporter gene; sequence analysis; translation regulation; Xenopus laevis; 5' Untranslated Regions; Animals; Autoantigens; Cell Line; Gene Expression; Protein Biosynthesis; Pyrimidines; Ribonucleoproteins; RNA, Messenger; Transfection; Xenopus; Animalia; Vertebrata; Xenopus laevis
Crosio, C., Boyl, P.P., Loreni, F., Pierandrei-Amaldi, P., & Amaldi, F. (2000). La protein has a positive effect on the translation of TOP mRNAs in vivo. NUCLEIC ACIDS RESEARCH, 28(15), 2927-2934 [10.1093/nar/28.15.2927].
Crosio, C; Boyl, P; Loreni, F; Pierandrei Amaldi, P; Amaldi, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/48105
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