The budding yeast regulation of Ace2 and morphogenesis (RAM) network integrates cell fate determination and morphogenesis. Its disruption impairs polarized growth and causes mislocalization of the transcription factor Ace2, resulting in failure of daughter cell–specific transcription required for cell separation. We find that phosphoregulation of the conserved AGC family kinase Cbk1 is critical for RAM network function. Intramolecular autophosphorylation of the enzyme's activation loop is critical for kinase activity but is only partially required for cell separation and polarized growth. In marked contrast, phosphorylation of a C-terminal hydrophobic motif is required for Cbk1 function in vivo but not for its kinase activity, suggesting a previously unappreciated level of control for this family of kinases. Phosphorylation of the C-terminal site is regulated over the cell cycle and requires the transcription factor Ace2 as well as all RAM network components. Therefore, Ace2 is not only a downstream target of Cbk1 but also reinforces activation of its upstream regulator.
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4 December 2006
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December 04 2006
Phosphoregulation of Cbk1 is critical for RAM network control of transcription and morphogenesis
Jaclyn M. Jansen,
Jaclyn M. Jansen
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
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Margaret F. Barry,
Margaret F. Barry
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
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Charles K. Yoo,
Charles K. Yoo
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
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Eric L. Weiss
Eric L. Weiss
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
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Jaclyn M. Jansen
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
Margaret F. Barry
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
Charles K. Yoo
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
Eric L. Weiss
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208
Correspondence to Eric L. Weiss: [email protected]
Abbreviations used in this paper: PKB, protein kinase B; RAM, regulation of Ace2 and morphogenesis.
Received:
April 19 2006
Accepted:
October 31 2006
Online ISSN: 1540-8140
Print ISSN: 0021-9525
The Rockefeller University Press
2006
J Cell Biol (2006) 175 (5): 755–766.
Article history
Received:
April 19 2006
Accepted:
October 31 2006
Citation
Jaclyn M. Jansen, Margaret F. Barry, Charles K. Yoo, Eric L. Weiss; Phosphoregulation of Cbk1 is critical for RAM network control of transcription and morphogenesis . J Cell Biol 4 December 2006; 175 (5): 755–766. doi: https://doi.org/10.1083/jcb.200604107
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