Enzyme. 1990;44(1-4):181-92.

Deadenylylation: a mechanism controlling c-fos mRNA decay.

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Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Mass.

Abstract

The c-fos proto-oncogene mRNA is extremely labile and is rapidly degraded within minutes after being transported to the cytoplasm of growth factor-stimulated fibroblasts. Analysis of the structural determinants controlling c-fos message decay reveals that this message contains at least two functionally independent elements that are responsible for its short half-life. One of these determinants is an AU-rich sequence present in the 3' untranslated region of the c-fos message, whereas the other determinant, which is structurally unrelated to the AU-rich element, is located within the c-fos protein-coding sequence. Both the c-fos AU-rich element and the coding region instability determinant appear to function by facilitating rapid removal of the c-fos poly(A) tail as a first step in the mRNA degradation process.

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U-rich sequence-binding proteins (URBPs) interacting with a 20-nucleotide U-rich sequence in the 3' untranslated region of c-fos mRNA may be involved in the first step of c-fos mRNA degradation. [Mol Cell Biol. 1992]
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