Substrate-mediated remodeling of methionine transport by multiple ubiquitin-dependent mechanisms in yeast cells. - Archive ouverte HAL Access content directly
Journal Articles EMBO Journal Year : 2006

Substrate-mediated remodeling of methionine transport by multiple ubiquitin-dependent mechanisms in yeast cells.

Abstract

Plasma membrane transport of single amino-acid methionine in yeast is shown to be mediated by at least seven different permeases whose activities are transcriptionaly and post-transcriptionaly regulated by different ubiquitin-dependent mechanisms. Upon high extracellular methionine exposure, three methionine-permease genes are repressed while four others are induced. SCF(Met30), SCF(Grr1) and Rsp5 ubiquitin ligases are the key actors of the ubiquitin-dependent remodeling of methionine transport. In addition to regulating the activity of Met4, the SCF(Met30) ubiquitin ligase is shown to convey an intracellular signal to a membrane initiated signaling pathway by controlling the nuclear concentration of the Stp1 transcription factor. By coupling intra- and extracellular metabolite sensing, SCF(Met30) thus allows yeast cells to accurately adjust the intermediary sulfur metabolism to the growth conditions. The multiple ubiquitin-dependent mechanisms that function in methionine transport regulation further exemplify the pervasive role of ubiquitin in the adaptation of single-cell organisms to environmental modifications.

Dates and versions

hal-00130784 , version 1 (13-02-2007)

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Alexandra Menant, Régine Barbey, Dominique Thomas. Substrate-mediated remodeling of methionine transport by multiple ubiquitin-dependent mechanisms in yeast cells.. EMBO Journal, 2006, 25 (19), pp.4436-47. ⟨10.1038/sj.emboj.7601330⟩. ⟨hal-00130784⟩
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