Activation of Divalent Cation Influx into S. cerevisiae Cells by Hypotonic Downshift

Activation of Divalent Cation Influx into S. cerevisiae Cells by Hypotonic Downshift Subjecting Saccharomyces cerevisiae cells to a hypotonic downshift by transferring cells from YPD medium containing 0.8 m sorbitol to YPD medium without sorbitol induces a transient rapid influx of Ca2+ and other divalent cations into the cell. For cells grown in YPD at 37°C, this hypotonic downshift increases Ca2+ accumulation 6.7-fold. Hypotonic downshift-induced Ca2+ accumulation and steady-state Ca2+ accumulation in isotonic YPD medium are differentially affected by dodecylamine and Mg2+. The Ca2+-influx pathway responsible for hypotonic-induced Ca2+ influx may account for about 10–35% of Ca2+ accumulation by cells growing in YPD. Ca2+ influx is not required for cells to survive a hypotonic downshift. Hypotonic downshift greatly reduces the ability of S. cerevisiae cells to survive a 5-min exposure to 10 mm Cd2+ suggesting that mutants resistant to acute Cd2+ exposure may help identify genes required for hypotonic downshift-induced divalent cation influx. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Activation of Divalent Cation Influx into S. cerevisiae Cells by Hypotonic Downshift

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Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 1997 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002329900296
Publisher site
See Article on Publisher Site

Abstract

Subjecting Saccharomyces cerevisiae cells to a hypotonic downshift by transferring cells from YPD medium containing 0.8 m sorbitol to YPD medium without sorbitol induces a transient rapid influx of Ca2+ and other divalent cations into the cell. For cells grown in YPD at 37°C, this hypotonic downshift increases Ca2+ accumulation 6.7-fold. Hypotonic downshift-induced Ca2+ accumulation and steady-state Ca2+ accumulation in isotonic YPD medium are differentially affected by dodecylamine and Mg2+. The Ca2+-influx pathway responsible for hypotonic-induced Ca2+ influx may account for about 10–35% of Ca2+ accumulation by cells growing in YPD. Ca2+ influx is not required for cells to survive a hypotonic downshift. Hypotonic downshift greatly reduces the ability of S. cerevisiae cells to survive a 5-min exposure to 10 mm Cd2+ suggesting that mutants resistant to acute Cd2+ exposure may help identify genes required for hypotonic downshift-induced divalent cation influx.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Nov 1, 1997

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