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. 1994 Jan;14(1):87–92. doi: 10.1128/mcb.14.1.87

Distinct domains of antizyme required for binding and proteolysis of ornithine decarboxylase.

X Li 1, P Coffino 1
PMCID: PMC358359  PMID: 8264655

Abstract

Selective degradation by proteasomes of ornithine decarboxylase, the initial enzyme in polyamine biosynthesis, is mediated by the polyamine-inducible protein antizyme. Antizyme binds to a region near the N terminus of ornithine decarboxylase (X. Li and P. Coffino, Mol. Cell. Biol. 12:3556-3562, 1992). This interaction induces a conformational change in ornithine decarboxylase that exposes its C terminus and inactivates the enzyme (X. Li and P. Coffino, Mol. Cell. Biol. 13:1487-1492, 1993). Here we show that the C-terminal half of antizyme alone can inactivate ornithine decarboxylase and alter its conformation, but it cannot direct degradation of the enzyme, either in vitro or in vivo. A portion of the N-terminal half of antizyme must be present to promote degradation.

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Selected References

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