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EMBO J

Title:		"The Ppz protein phosphatases are key regulators of K+ and pH homeostasis: implications for salt tolerance, cell wall integrity and cell cycle progression"
Author(s):		Yenush L; Mulet JM; Arino J; Serrano R;
Address:		"Instituto de Biologia Molecular y Celular de Plantas, Universidad Politecnica de Valencia-CSIC, Camino de Vera s/n, E-46022 Valencia, Spain. serrano@ibmcp.upv.es"
Journal Title:		EMBO J
Year:		2002
Volume:		21
Issue:		5
Page Number:		920 - 929
DOI:		10.1093/emboj/21.5.920
ISSN/ISBN:		0261-4189 (Print) 1460-2075 (Electronic) 0261-4189 (Linking)
Abstract:		"The yeast Ppz protein phosphatases and the Hal3p inhibitory subunit are important determinants of salt tolerance, cell wall integrity and cell cycle progression. We present several lines of evidence showing that these disparate phenotypes are connected by the fact that Ppz regulates K+ transport. First, salt tolerance, cell wall integrity and cell cycle phenotypes of Ppz mutants are dependent on the Trk K+ transporters. Secondly, Ppz mutants exhibit altered activity of the Trk system, as measured by rubidium uptake. Thirdly, Ppz mutants exhibit altered intracellular K+ and pH, as expected from H+ efflux providing electrical balance during K+ uptake. Our unifying picture of Ppz phenotypes contends that activation of Trk by decreased Ppz activity results in plasma membrane depolarization (reducing uptake of toxic cations), increased intracellular K+ and turgor (compromising cell integrity), and increased intracellular pH (augmenting the expression of pH-regulated genes and facilitating alpha-factor recovery). In addition to providing a coherent explanation for all Ppz-dependent phenotypes, our results provide evidence for a causal relationship between intracellular cation homeostasis and a potential cell cycle checkpoint"
Keywords:		Adenosine Triphosphatases/genetics/physiology Carrier Proteins/genetics/physiology *Cation Transport Proteins Cell Cycle *Cell Cycle Proteins Cell Wall/*physiology *Fungal Proteins G1 Phase Homeostasis Ion Transport/physiology Mating Factor Membrane Prote;
Notes:		"MedlineYenush, Lynne Mulet, Jose M Arino, Joaquin Serrano, Ramon eng Research Support, Non-U.S. Gov't England 2002/02/28 EMBO J. 2002 Mar 1; 21(5):920-9. doi: 10.1093/emboj/21.5.920"