Cited by 36PI3K/AKT/mTOR signaling in cancerFungal and yeast genetics researchProtein Kinase Regulation and GTPase Signaling

Differential Phosphorylation of a Regulatory Subunit of Protein Kinase CK2 by Target of Rapamycin Complex 1 Signaling and the Cdc-like Kinase Kns1

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Sanchez-Casalongue, Manuel E., Lee, Jaehoon, Diamond, Aviva, Shuldiner, Scott, Moir, Robyn D., Willis, Ian M.·2015·Journal of Biological Chemistry

Abstract

Transcriptional regulation of ribosome and tRNA synthesis plays a central role in determining protein synthetic capacity and is tightly controlled in response to nutrient availability and cellular stress. In Saccharomyces cerevisiae, the regulation of ribosome and tRNA synthesis was recently shown to involve the Cdc-like kinase Kns1 and the GSK-3 kinase Mck1. In this study, we explored additional roles for these conserved kinases in processes connected to the target of rapamycin complex 1 (TORC1). We conducted a synthetic chemical-genetic screen in a kns1Δ mck1Δ strain and identified many novel rapamycin-hypersensitive genes. Gene ontology analysis showed enrichment for TORC1-regulated processes (vesicle-mediated transport, autophagy, and regulation of cell size) and identified new connections to protein complexes including the protein kinase CK2. CK2 is considered to be a constitutively active kinase and in budding yeast, the holoenzyme comprises two regulatory subunits, Ckb1 and Ckb2, and two catalytic subunits, Cka1 and Cka2. We show that Ckb1 is differentially phosphorylated in vivo and that Kns1 mediates this phosphorylation when nutrients are limiting and under all tested stress conditions. We determined that the phosphorylation of Ckb1 does not detectably affect the stability of the CK2 holoenzyme but correlates with the reduced occupancy of Ckb1 on tRNA genes after rapamycin treatment. Thus, the differential occupancy of tRNA genes by CK2 is likely to modulate its activation of RNA polymerase III transcription. Our data suggest that TORC1, via its effector kinase Kns1, may regulate the association of CK2 with some of its substrates by phosphorylating Ckb1.

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  1. Sanchez-Casalongue, M. (2014) A link between TORC1 and CK2 in S. cerevisiae via the Cdc-like kinase Kns1. Ph.D. thesis, Albert Einstein Col- lege of Medicine, New York

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Authors
Sanchez-Casalongue, M. E., Lee, J., Diamond, A., Shuldiner, S., Moir, R. D., & Willis, I. M.
Affiliations
Albert Einstein College of Medicine (US)
Corresponding author
Willis, Ian M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2015-03
Volume
290
Issue
11
Pages
7221-7233
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2025678066
Cited by
36
References
61
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 2 · 2018: 5 · 2017: 7 · 2016: 4 · 2015: 2
FWCI
2.60
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (T32-GM007288, RO1 GM085177)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
casein kinase 2, TORC1 signaling, ribosome biogenesis, tRNA gene transcription, RNA polymerase III, nutrient limitation, cellular stress, vesicle trafficking, autophagy, cell size control, Saccharomyces cerevisiae
MeSH terms
Antifungal Agents, Mutation, Phosphorylation, RNA Polymerase III, Saccharomyces cerevisiae, Stress, Physiological, Transcription Factors, Signal Transduction, Transcriptional Activation, Gene Expression Regulation, Fungal, Protein Serine-Threonine Kinases, Gene Deletion, Sirolimus, Protein Subunits, Saccharomyces cerevisiae Proteins, Casein Kinase II

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