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Vol. 13, Issue 11, 3901-3914, November 2002
§
i
icová,*
*Department of Genetics and Microbiology, Charles University,
Vini On solid substrate, growing yeast colonies alternately acidify and
alkalinize the medium. Using morphological, cytochemical, genetic, and
DNA microarray approaches, we characterized six temporal steps in the
"acid-to-alkali" colony transition. This transition is connected
with the production of volatile ammonia acting as starvation signal
between colonies. We present evidence that the three membrane proteins
Ato1p, Ato2p, and Ato3p, members of the YaaH family, are involved in
ammonia production in Saccharomyces cerevisiae colonies.
The acid-to-alkali transition is connected with decrease of
mitochondrial oxidative catabolism and by peroxisome activation, which
in parallel with activation of biosynthetic pathways contribute to
decrease the general stress level in colonies. These metabolic features
characterize a novel survival strategy used by yeast under starvation
conditions prevalent in nature.
ná 5, 12844 Prague 2, Czech Republic; and
§Laboratoire de Génétique Moléculaire,
CNRS 8541, Ecole Normale Supérieure, 75005 Paris, France
Corresponding author. E-mail address:
zdenap{at}natur.cuni.cz.
Both authors contributed equally to the work.
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