Pho85 kinase, a cyclin-dependent kinase, regulates nuclear accumulation of the Rim101 transcription factor in the stress response of Saccharomyces cerevisiae.
The budding yeast Saccharomyces cerevisiae alters its gene expression profile in response to changing environmental conditions. The Pho85 kinase, one of the yeast cyclin-dependent kinases (CDK), is known to play an important role in the cellular response to alterations in parameters such as nutrient levels and salinity. Several genes whose expression is regulated, either directly or indirectly, by the Rim101 transcription factor become constitutively activated when Pho85 function is absent. Because Rim101 is responsible for adaptation to alkaline conditions, this observation suggests an interaction between Pho85 and Rim101 in the response to alkaline stress. We have found that Pho85 affects neither RIM101 transcription, the proteolytic processing that is required for Rim101 activation, nor Rim101 stability. Rather, Pho85 regulates the nuclear accumulation of active Rim101, possibly via phosphorylation. Additionally, we report that Pho85 and the transcription factor Pho4 are necessary for adaptation to alkaline conditions and that PTK2 activation by Pho4 is involved in this process. These findings illustrate novel roles for the regulators of the PHO system when yeast cells cope with various environmental stresses potentially threatening their survival.
Nishizawa
Masafumi
M
Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan. mas@sc.itc.keio.ac.jp
Tanigawa
Mirai
M
Hayashi
Michio
M
Maeda
Tatsuya
T
Yazaki
Yoshiaki
Y
Saeki
Yasushi
Y
Toh-e
Akio
A
D018844:Cyclin-Dependent Kinases / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D013312:Stress, Physiological / Q000235:genetics*
C489601:RIM101 protein, S cerevisiae; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; C522753:PTK2 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases; D018844:Cyclin-Dependent Kinases; C058605:PHO85 protein, S cerevisiae
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