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. 1996 Dec 15;320(Pt 3):755–760. doi: 10.1042/bj3200755

Feedback repression of ornithine decarboxylase synthesis mediated by antizyme.

J L Mitchell 1, C Y Choe 1, G G Judd 1
PMCID: PMC1217994  PMID: 9003359

Abstract

The induction of antizyme by spermidine and the resulting enhancement of ornithine decarboxylase (ODC) degradation have been well studied; however, little is known about the mechanism whereby elevated spermidine levels decrease synthesis of the polyamine biosynthetic enzyme. To evaluate the relative contribution of inhibited synthesis, as distinct from enhanced degradation of ODC, spermidine levels were manipulated in a variant cell line that overproduces a stable form of ODC. Spermidine did not selectively inhibit ODC synthesis in these variant cells, supporting the concept that spermidine diminishes ODC synthesis in normal cells owing to enhanced degradation of the protein in the presence of elevated antizyme levels. This model was further investigated in vitro by use of rabbit reticulocyte lysate, which catalyses simultaneous ODC mRNA translation and antizyme-stimulated degradation of ODC protein. Antizyme strongly repressed the incorporation of labelled amino acids into normal rat ODC. Unexpectedly it also diminished the apparent translation of ODC mRNA species coding for enzyme forms that are not destabilized by the post-translational addition of antizyme. The effect of antizyme on ODC translation was not observed in wheatgerm extract, in which there is no antizyme-induced degradation. Further, deletion of a short segment of antizyme necessary for the destabilization of ODC (amino acid residues 113-118) resulted in a form that bound ODC but did not diminish its apparent translation. These results suggest that the co-translational addition of antizyme to ODC results in a complex that is different from, and innately less stable than, that formed when antizyme is added post-translationally.

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Selected References

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