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Published 22 December 2003. doi:10.1083/jcb.200306139
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© The Rockefeller University Press, 0021-9525/2003/12/1243 $8.00
The Journal of Cell Biology, Volume 163, Number 6, 1243-1254

Article

Mathematical model of the morphogenesis checkpoint in budding yeast



Andrea Ciliberto1, Bela Novak2,3 and John J. Tyson1

1 Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
2 Molecular Network Dynamics Research Group of Hungarian Academy of Sciences, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
3 Department of Agricultural Chemical Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary

Address correspondence to John J. Tyson, Dept. of Biology, M.C. 0406, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. Tel.: (540) 231-4662. Fax: (540) 231-9307. email: tyson{at}vt.edu

The morphogenesis checkpoint in budding yeast delays progression through the cell cycle in response to stimuli that prevent bud formation. Central to the checkpoint mechanism is Swe1 kinase: normally inactive, its activation halts cell cycle progression in G2. We propose a molecular network for Swe1 control, based on published observations of budding yeast and analogous control signals in fission yeast. The proposed Swe1 network is merged with a model of cyclin-dependent kinase regulation, converted into a set of differential equations and studied by numerical simulation. The simulations accurately reproduce the phenotypes of a dozen checkpoint mutants. Among other predictions, the model attributes a new role to Hsl1, a kinase known to play a role in Swe1 degradation: Hsl1 must also be indirectly responsible for potent inhibition of Swe1 activity. The model supports the idea that the morphogenesis checkpoint, like other checkpoints, raises the cell size threshold for progression from one phase of the cell cycle to the next.

Key Words: molecular networks; dynamical systems; cell cycle; size control; Swe1 kinase

The online version of this article contains supplemental material.

Abbreviations used in this paper: MPF, M-phase promoting factor; ND, nuclear division.


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