Trends Cell Biol. 2002 Mar;12(3):104-7.

A phosphorylation-driven ubiquitination switch for cell-cycle control.

Abstract

Cellular changes in state can be dictated by complex all-or-nothing switches built from ultrasensitive protein kinase cascades, positive-feedback loops and other mechanisms. Recent work has established that phosphorylation-driven protein destruction through the SCF ubiquitin-ligase pathway can also occur in a switch-like manner. In this context, multiple phosphorylation events are used to set a threshold for substrate targeting, thereby providing a framework for understanding the inter-relationship between protein phosphorylation and ubiquitin-mediated proteolysis.

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A phosphorylation-driven ubiquitination switch for cell-cycle control.

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