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- Title
A genome-wide survey suggests an osmoprotective role for vacuolar Ca<sub>2+</sub> release in cell wall-compromised yeast.
- Authors
Loukin, Stephen; Xinliang Zhou; Ching Kung; Saimi, Yoshiro
- Abstract
In yeast, osmotic upshock causes a release of vacuolar Ca2+ through the mechanosensitive transient receptor potential channel, Yvc1. We screened the collection of 4810 yeast gene deletants twice for alterations in this response in an attempt to find elements that regulate the amount of vacuolar Ca2+ or the Yvc1 channel. Severe overresponders and underresponders to upshock were further scrutinized for their calcium content with 45Ca and their Yvc1 electrophysiological activities under patch-clamp. The severe underresponders have lower calcium content but no change in Yvc1 activity. The strong overresponders, most of which are deleted of genes involved in cell wall metabolism, have higher calcium content. Wall mutations are known to up-regulate Ca2+-calcineurin-dependent genes. It appears that stress on the cell wall induces Ca2+ accumulation, adaptively anticipating the need in defense or repair against future stress, including osmotic stress.--Loukin, S., Zhou, X., Kung, C., Saimi, Y. A genome-wide survey suggests an osmoprotective role for vacuolar Ca2+ release in cell wall-compromised yeast.
- Subjects
SACCHAROMYCES cerevisiae; SACCHAROMYCES; TRP channels; GENES; CALCIUM
- Publication
FASEB Journal, 2008, Vol 22, Issue 7, p2405
- ISSN
0892-6638
- Publication type
Article
- DOI
10.1096/fj.07-101410