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J Cell Biol. 2012 Apr 2;197(1):89-104. doi: 10.1083/jcb.201108108. Epub 2012 Mar 26.

A link between mitotic entry and membrane growth suggests a novel model for cell size control.

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  • 1Department of Molecular, Cell, and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.

Abstract

Addition of new membrane to the cell surface by membrane trafficking is necessary for cell growth. In this paper, we report that blocking membrane traffic causes a mitotic checkpoint arrest via Wee1-dependent inhibitory phosphorylation of Cdk1. Checkpoint signals are relayed by the Rho1 GTPase, protein kinase C (Pkc1), and a specific form of protein phosphatase 2A (PP2A(Cdc55)). Signaling via this pathway is dependent on membrane traffic and appears to increase gradually during polar bud growth. We hypothesize that delivery of vesicles to the site of bud growth generates a signal that is proportional to the extent of polarized membrane growth and that the strength of the signal is read by downstream components to determine when sufficient growth has occurred for initiation of mitosis. Growth-dependent signaling could explain how membrane growth is integrated with cell cycle progression. It could also control both cell size and morphogenesis, thereby reconciling divergent models for mitotic checkpoint function.

Comment in

  • Relaying membrane status. [Nat Rev Mol Cell Biol. 2012]
PMID:
22451696
[PubMed - indexed for MEDLINE]
PMCID:
PMC3317797
Free PMC Article

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