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Genetics

Title:		The TEA transcription factor Tec1 links TOR and MAPK pathways to coordinate yeast development
Author(s):		Bruckner S; Kern S; Birke R; Saugar I; Ulrich HD; Mosch HU;
Address:		"Department of Genetics, Philipps Universitat, D-35043 Marburg, Germany"
Journal Title:		Genetics
Year:		2011
Volume:		20110811
Issue:		2
Page Number:		479 - 494
DOI:		10.1534/genetics.111.133629
ISSN/ISBN:		1943-2631 (Electronic) 0016-6731 (Print) 0016-6731 (Linking)
Abstract:		"In Saccharomyces cerevisiae, the TEA transcription factor Tec1 controls several developmental programs in response to nutrients and pheromones. Tec1 is targeted by the pheromone-responsive Fus3/Kss1 mitogen-activated protein kinase (MAPK) cascade, which destabilizes the transcription factor to ensure efficient mating of sexual partner cells. The regulation of Tec1 by signaling pathways that control cell division and development in response to nutrients, however, is not known. Here, we show that Tec1 protein stability is under control of the nutrient-sensitive target of rapamycin complex 1 (TORC1) signaling pathway via the Tip41-Tap42-Sit4 branch. We further show that degradation of Tec1 upon inhibition of TORC1 by rapamycin does not involve polyubiquitylation and appears to be proteasome independent. However, rapamycin-induced Tec1 degradation depends on the HECT ubiquitin ligase Rsp5, which physically interacts with Tec1 via conserved PxY motives. We further demonstrate that rapamycin and mating pheromone control Tec1 protein stability through distinct mechanisms by targeting different domains of the transcription factor. Finally, we show that Tec1 is a positive regulator of yeast chronological lifespan (CLS), a known TORC1-regulated process. Our findings indicate that in yeast, Tec1 links TORC1 and MAPK signaling pathways to coordinate control of cellular development in response to different stimuli"
Keywords:		"Adaptor Proteins, Signal Transducing/genetics/metabolism Antifungal Agents/pharmacology Blotting, Northern Cyclins/genetics/metabolism DNA-Binding Proteins/genetics/*metabolism Endosomal Sorting Complexes Required for Transport/genetics/metabolism Gene Ex;"
Notes:		"MedlineBruckner, Stefan Kern, Sandra Birke, Raphael Saugar, Irene Ulrich, Helle D Mosch, Hans-Ulrich eng Research Support, Non-U.S. Gov't 2011/08/16 Genetics. 2011 Oct; 189(2):479-94. doi: 10.1534/genetics.111.133629. Epub 2011 Aug 11"