Yeast Sphingolipid Phospholipase Gene ISC1 Regulates the Spindle Checkpoint by a CDC55-Dependent Mechanism

Nabil Matmati, Bachar H. Hassan, Jihui Ren, Ashraf A. Shamssedine, Eunmi Jeong, Baasil Shariff, Justin Snider, Steven V. Rødkær, Guocai Chen, Bidyut K. Mohanty, W. Jim Zheng, Lina M. Obeid, Martin Røssel-Larsen, Nils J. Færgeman, Yusuf A. Hannun

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Defects in the spindle assembly checkpoint (SAC) can lead to aneuploidy and cancer. Sphingolipids have important roles in many cellular functions, including cell cycle regulation and apoptosis. However, the specific mechanisms and functions of sphingolipids in cell cycle regulation have not been elucidated. Using analysis of concordance for synthetic lethality for the yeast sphingolipid phospholipase ISC1, we identified two groups of genes. The first comprises genes involved in chromosome segregation and stability (CSM3, CTF4, YKE2, DCC1, and GIM4) as synthetically lethal with ISC1 The second group, to which ISC1 belongs, comprises genes involved in the spindle checkpoint (BUB1, MAD1, BIM1, and KAR3), and they all share the same synthetic lethality with the first group. We demonstrate that spindle checkpoint genes act upstream of Isc1, and their deletion phenocopies that of ISC1 Reciprocally, ISC1 deletion mutants were sensitive to benomyl, indicating a SAC defect. Similar to BUB1 deletion, ISC1 deletion prevents spindle elongation in hydroxyurea-treated cells. Mechanistically, PP2A-Cdc55 ceramide-activated phosphatase was found to act downstream of Isc1, thus coupling the spindle checkpoint genes and Isc1 to CDC55-mediated nuclear functions.

Original languageEnglish
Article numbere00340-19
JournalMolecular and Cellular Biology
Volume40
Issue number12
ISSN0270-7306
DOIs
Publication statusPublished - May 2020

Keywords

  • budding yeast
  • CDC55
  • cell cycle
  • ceramide
  • hydroxyurea
  • ISC1
  • phosphoproteomics
  • spindle checkpoint
  • SWE1

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    Matmati, N., Hassan, B. H., Ren, J., Shamssedine, A. A., Jeong, E., Shariff, B., Snider, J., Rødkær, S. V., Chen, G., Mohanty, B. K., Zheng, W. J., Obeid, L. M., Røssel-Larsen, M., Færgeman, N. J., & Hannun, Y. A. (2020). Yeast Sphingolipid Phospholipase Gene ISC1 Regulates the Spindle Checkpoint by a CDC55-Dependent Mechanism. Molecular and Cellular Biology, 40(12), [e00340-19]. https://doi.org/10.1128/MCB.00340-19