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Fps1p controls the accumulation and release of the compatible solute glycerol in yeast osmoregulation.

Journal article
Authors Markus J. Tamás
K Luyten
F C Sutherland
A Hernandez
J Albertyn
Hadi Valadi
H Li
B A Prior
S G Kilian
J Ramos
L Gustafsson
J M Thevelein
Stefan Hohmann
Published in Molecular microbiology
Volume 31
Issue 4
Pages 1087-104
ISSN 0950-382X
Publication year 1999
Published at Department of Cell and Molecular Biology
Pages 1087-104
Language en
Keywords Biological Transport, Fungal Proteins, genetics, metabolism, Gene Deletion, Gene Expression Regulation, Fungal, Glycerol, metabolism, Hypertonic Solutions, pharmacology, Membrane Proteins, genetics, metabolism, Osmolar Concentration, Saccharomyces cerevisiae, genetics, growth & development, metabolism, Saccharomyces cerevisiae Proteins, Signal Transduction, Water-Electrolyte Balance
Subject categories Cell and molecular biology


The accumulation of compatible solutes, such as glycerol, in the yeast Saccharomyces cerevisiae, is a ubiquitous mechanism in cellular osmoregulation. Here, we demonstrate that yeast cells control glycerol accumulation in part via a regulated, Fps1p-mediated export of glycerol. Fps1p is a member of the MIP family of channel proteins most closely related to the bacterial glycerol facilitators. The protein is localized in the plasma membrane. The physiological role of Fps1p appears to be glycerol export rather than uptake. Fps1 delta mutants are sensitive to hypo-osmotic shock, demonstrating that osmolyte export is required for recovery from a sudden drop in external osmolarity. In wild-type cells, the glycerol transport rate is decreased by hyperosmotic shock and increased by hypo-osmotic shock on a subminute time scale. This regulation seems to be independent of the known yeast osmosensing HOG and PKC signalling pathways. Mutants lacking the unique hydrophilic N-terminal domain of Fps1p, or certain parts thereof, fail to reduce the glycerol transport rate after a hyperosmotic shock. Yeast cells carrying these constructs constitutively release glycerol and show a dominant hyperosmosensitivity, but compensate for glycerol loss after prolonged incubation by glycerol overproduction. Fps1p may be an example of a more widespread class of regulators of osmoadaptation, which control the cellular content and release of compatible solutes.

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