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Repression of growth-regulated Gl cyclin expression by cyclic AMP in budding yeast

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Abstract

A YEAST cell becomes committed to the cell division cycle only if it grows to a critical size1–4 and reaches a critical rate of protein synthesis5,6. The coordination between growth and division takes place at a control step during the Gl phase of the cell cycle called Start4. It relies on the Gl-specific cyclins encoded by CLN1, 2 and 3, which trigger Start through the activation of the Cdc28 protein kinase. In fact, the Cln cyclins are rate-limiting for Start execution and depend on growth7–10. Here we report that the cyclic AMP signal pathway11 modulates the dependency of Cln cyclins on growth. In particular, more growth is required to trigger Start because CLN1 and CLN2 are repressed by the cAMP signal, thus explaining the previously observed cAMP-dependent increase of the critical size and critical rate of protein synthesis12. Cln3 is not inhibited by the cAMP pathway and counteracts this mechanism by partially mediating the growth-dependent expression of other Gl cyclins.

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Authors and Affiliations

  1. Sezione di Biochimica Comparata, Dipartimento di Fisiologia e Biochimica General!, Università degli Studi di Milano, Via Celoria 26, 20133, Milano, Italy

    Maurizio D. Baroni , Paolo Monti &  Lllia Alberghina

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  1. Maurizio D. Baroni
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  2. Paolo Monti
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  3. Lllia Alberghina
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Baroni , M., Monti, P. & Alberghina, . Repression of growth-regulated Gl cyclin expression by cyclic AMP in budding yeast. Nature 371, 339–342 (1994). https://doi.org/10.1038/371339a0

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