Crossref journal-article
American Society for Cell Biology (ASCB)
Molecular Biology of the Cell (1076)
Abstract

Inoculation of diploid budding yeast onto nitrogen-poor agar media stimulates a MAPK pathway to promote filamentous growth. Characteristics of filamentous cells include a specific pattern of gene expression, elongated cell shape, polar budding pattern, persistent attachment to the mother cell, and a distinct cell cycle characterized by cell size control at G2/M. Although a requirement for MAPK signaling in filamentous gene expression is well established, the role of this pathway in the regulation of morphogenesis and the cell cycle remains obscure. We find that ectopic activation of the MAPK signal pathway induces a cell cycle shift to G2/M coordinately with other changes characteristic of filamentous growth. These effects are abrogated by overexpression of the yeast mitotic cyclins Clb1 and Clb2. In turn, yeast deficient for Clb2 or carrying cdc28-1N, an allele of CDK defective for mitotic functions, display enhanced filamentous differentiation and supersensitivity to the MAPK signal. Importantly, activation of Swe1-mediated inhibitory phosphorylation of Thr-18 and/or Tyr-19 of Cdc28 is not required for the MAPK pathway to affect the G2/M delay. Mutants expressing a nonphosphorylatable mutant Cdc28 or deficient for Swe1 exhibit low-nitrogen-dependent filamentous growth and are further induced by an ectopic MAPK signal. We infer that the MAPK pathway promotes filamentous growth by a novel mechanism that inhibits mitotic cyclin/CDK complexes and thereby modulates cell shape, budding pattern, and cell-cell connections.

Bibliography

Ahn, S.-H., Acurio, A., & Kron, S. J. (1999). Regulation of G2/M Progression by the STE Mitogen-activated Protein Kinase Pathway in Budding Yeast Filamentous Growth. Molecular Biology of the Cell, 10(10), 3301–3316.

Authors 3
  1. Sung-Hee Ahn (first)
  2. Adriana Acurio (additional)
  3. Stephen J. Kron (additional)
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Dates
Type When
Created 12 years, 1 month ago (July 2, 2013, 7:19 p.m.)
Deposited 3 years, 6 months ago (Feb. 26, 2022, 9:37 p.m.)
Indexed 1 year ago (Aug. 5, 2024, 9:58 a.m.)
Issued 25 years, 10 months ago (Oct. 1, 1999)
Published 25 years, 10 months ago (Oct. 1, 1999)
Published Print 25 years, 10 months ago (Oct. 1, 1999)
Funders 0

None

@article{Ahn_1999, title={Regulation of G2/M Progression by the STE Mitogen-activated Protein Kinase Pathway in Budding Yeast Filamentous Growth}, volume={10}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.10.10.3301}, DOI={10.1091/mbc.10.10.3301}, number={10}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Ahn, Sung-Hee and Acurio, Adriana and Kron, Stephen J.}, editor={Solomon, Mark J.}, year={1999}, month=oct, pages={3301–3316} }