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

Tamás, Markus J., 1970 (author)
Gothenburg University,Göteborgs universitet,Institutionen för cell- och molekylärbiologi,Department of Cell and Molecular Biology,University of Gothenburg
Luyten, K (author)
Sutherland, F C (author)
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Hernandez, A (author)
Albertyn, J (author)
Valadi, Hadi, 1963 (author)
Gothenburg University,Göteborgs universitet,Institutionen för cell- och molekylärbiologi,Department of Cell and Molecular Biology,University of Gothenburg
Li, H (author)
Prior, B A (author)
Kilian, S G (author)
Ramos, J (author)
Gustafsson, L (author)
Gothenburg University,Göteborgs universitet,Institutionen för cell- och molekylärbiologi,Department of Cell and Molecular Biology,University of Gothenburg
Thevelein, J M (author)
Hohmann, Stefan, 1956 (author)
Gothenburg University,Göteborgs universitet,Institutionen för cell- och molekylärbiologi,Department of Cell and Molecular Biology,University of Gothenburg
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 (creator_code:org_t)
1999
1999
English.
In: Molecular microbiology. - 0950-382X .- 1365-2958. ; 4, s. 1087-104
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

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
Water-Electrolyte Balance

Publication and Content Type

ref (subject category)
art (subject category)

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