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Molecular and Cellular Biology, March 2003, p. 1509-1519, Vol. 23, No. 5
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.5.1509-1519.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Transcript-Selective Translational Silencing by Gamma Interferon Is Directed by a Novel Structural Element in the Ceruloplasmin mRNA 3' Untranslated Region

Department of Cell Biology, The Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195,¹ Department of Biology, Cleveland State University, Cleveland, Ohio 44115²

Received 8 August 2002/ Returned for modification 25 September 2002/ Accepted 26 November 2002

Transcript-selective translational control of eukaryotic gene expression is often directed by a structural element in the 3' untranslated region (3'-UTR) of the mRNA. In the case of ceruloplasmin (Cp), induced synthesis of the protein by gamma interferon (IFN-) in U937 monocytic cells is halted by a delayed translational silencing mechanism requiring the binding of a cytosolic inhibitor to the Cp 3'-UTR. Silencing requires the essential elements of mRNA circularization, i.e., eukaryotic initiation factor 4G, poly(A)-binding protein, and poly(A) tail. We here determined the minimal silencing element in the Cp 3'-UTR by progressive deletions from both termini. A minimal, 29-nucleotide (nt) element was determined by gel shift assay to be sufficient for maximal binding of the IFN--activated inhibitor of translation (GAIT), an as-yet-unidentified protein or complex. The interaction was shown to be functional by an in vitro translation assay in which the GAIT element was used as a decoy to overcome translational silencing. Mutation analysis showed that the GAIT element contained a 5-nt terminal loop, a weak 3-bp helix, an asymmetric internal bulge, and a proximal 6-bp helical stem. Two invariant loop residues essential for binding activity were identified. Ligation of the GAIT element immediately downstream of a luciferase reporter conferred the translational silencing response to the heterologous transcript in vitro and in vivo; a construct containing a nonbinding, mutated GAIT element was ineffective. Translational silencing of Cp, and possibly other transcripts, mediated by the GAIT element may contribute to the resolution of the local inflammatory response following cytokine activation of macrophages.

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