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XB-ART-21294
Mol Cell Biol 1994 May 01;145:3130-8. doi: 10.1128/mcb.14.5.3130-3138.1994.
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An estrogen-inducible protein binds specifically to a sequence in the 3' untranslated region of estrogen-stabilized vitellogenin mRNA.

Dodson RE , Shapiro DJ .


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The 3' untranslated region (3'-UTR) has been implicated in the estrogen stabilization of hepatic Xenopus laevis vitellogenin mRNA. We used RNA gel mobility shift assays to demonstrate that Xenopus liver contains a factor which binds with very high specificity to a segment of the 3'-UTR of vitellogenin B1 and B2 mRNAs. We detected a single high-affinity binding site in the vitellogenin mRNA 3'-UTR and localized the binding site to a 27-nucleotide region. Since binding was abolished by proteinase K digestion, at least a component of the factor is a protein. Following estrogen administration, binding was induced approximately four- to fivefold in extracts from liver polysomes. The hepatic vitellogenin mRNA-binding protein was found in both polysomes and cytosol. Since the protein was also estrogen inducible in cytosol, this represents a genuine induction, not simply recruitment of the cytosolic protein into polysomes. UV cross-linking studies with the 27-nucleotide recognition sequence revealed bands corresponding to bound proteins with apparent molecular weights of 71,000 and 141,000. This appears to be the first example of steroid hormone-inducible proteins binding to an mRNA 3'-UTR. Its induction by estrogen and its sequence-specific binding to a region of vitellogenin mRNA important in estrogen-mediated stabilization suggest that the protein may play a role in the regulation of mRNA stability.

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Species referenced: Xenopus laevis

References [+] :
Ali, Modulation of transcriptional activation by ligand-dependent phosphorylation of the human oestrogen receptor A/B region. 1993, Pubmed