Cited by 32Ion channel regulation and functionFungal and yeast genetics researchIon Channels and Receptors

Activation of an Essential Calcium Signaling Pathway in Saccharomyces cerevisiae by Kch1 and Kch2, Putative Low-Affinity Potassium Transporters

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Stefan, Christopher P., Zhang, Nannan, Sokabe, Takaaki, Rivetta, Alberto, Slayman, Clifford L., Montell, Craig, Cunningham, Kyle W.·2013·Eukaryotic Cell

Abstract

In the budding yeast Saccharomyces cerevisiae , mating pheromones activate a high-affinity Ca 2+ influx system (HACS) that activates calcineurin and is essential for cell survival. Here we identify extracellular K + and a homologous pair of transmembrane proteins, Kch1 and Kch2 (Prm6), as necessary components of the HACS activation mechanism. Expression of Kch1 and especially Kch2 was strongly induced during the response to mating pheromones. When forcibly overexpressed, Kch1 and Kch2 localized to the plasma membrane and activated HACS in a fashion that depended on extracellular K + but not pheromones. They also promoted growth of trk1 trk2 mutant cells in low K + environments, suggesting they promote K + uptake. Voltage-clamp recordings of protoplasts revealed diminished inward K + currents in kch1 kch2 double-mutant cells relative to the wild type. Conversely, heterologous expression of Kch1 in HEK293T cells caused the appearance of inwardly rectifying K + currents. Collectively, these findings suggest that Kch1 and Kch2 directly promote K + influx and that HACS may electrochemically respond to K + influx in much the same way as the homologous voltage-gated Ca 2+ channels in most animal cell types.

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Crossref · 10.1128/ec.00299-12

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Authors
Stefan, C. P., Zhang, N., Sokabe, T., Rivetta, A., Slayman, C. L., Montell, C., & Cunningham, K. W.
Affiliations
  • Johns Hopkins University (US)
  • Yale University (US)
Venue
Eukaryotic Cell
Published
2013-02
Volume
12
Issue
2
Pages
204-214
ISSN
  • 1535-9778 (ISSN-L)
  • 1535-9786
OpenAlex
W2169212382
Cited by
32
References
55
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2018: 3 · 2017: 3 · 2016: 7 · 2015: 7 · 2014: 2 · 2013: 2
FWCI
1.41
Type
journal article
Language
en
Open access
Locations
  • Eukaryotic Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Eye Institute (EY10852, R01EY010852)
  • National Institute of General Medical Sciences (R01GM053082, GM085335, GM 60696, R01GM085335, GM053082, R01GM060696)
  • National Institute of Neurological Disorders and Stroke (NS074072, R21NS074072)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
potassium transporters, mating pheromone response, calcineurin, inward rectifier potassium current, plasma membrane proteins, Saccharomyces cerevisiae
MeSH terms
Mating Factor, Calcium Chloride, Humans, Hydrogen-Ion Concentration, Membrane Potentials, Peptides, Potassium, Saccharomyces cerevisiae, Calcium Channels, Gene Expression, Patch-Clamp Techniques, Calcium Signaling, Protein Transport, Cation Transport Proteins, Saccharomyces cerevisiae Proteins, Gene Knockout Techniques, HEK293 Cells

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