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Analysis of cell-cycle specific localization of the Rdi1p RhoGDI and the structural determinants required for Cdc42p membrane localization and clustering at sites of polarized growth

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Abstract

The Cdc42p GTPase regulates multiple signal transduction pathways through its interactions with downstream effectors. Specific functional domains within Cdc42p are required for guanine-nucleotide binding, interactions with downstream effectors, and membrane localization. However, little is known about how Cdc42p is clustered at polarized growth sites or is extracted from membranes by Rho guanine-nucleotide dissociation inhibitors (RhoGDIs) at specific times in the cell cycle. To address these points, localization studies were performed in Saccharomyces cerevisiae using green fluorescent protein (GFP)-tagged Cdc42p and the RhoGDI Rdi1p. GFP-Rdi1p localized to polarized growth sites at specific times of the cell cycle but not to other sites of Cdc42p localization. Overexpression of Rdi1p led to loss of GFP-Cdc42p from internal and plasma membranes. This effect was mediated through the Cdc42p Rho-insert domain, which was also implicated in interactions with the Bni1p scaffold protein. These data suggested that Rdi1p functions in cell cycle-specific Cdc42p membrane detachment. Additional genetic and time-lapse microscopy analyses implicated nucleotide binding in the clustering of Cdc42p. Taken together, these results provide insight into the complicated nature of the relationships between Cdc42p localization, nucleotide binding, and protein–protein interactions.

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Acknowledgements

We thank Anthony Bretscher for valuable reagents, Herman Chen and Patti McClard for expert technical assistance, and members of the Johnson Laboratory for valuable discussions and critical comments on this manuscript. K.C.C. was supported in part by an undergraduate fellowship from the UVM-Howard Hughes HELiX Program. This research was supported by National Science Foundation grant MCB-0110138.

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Correspondence to Douglas I. Johnson.

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Communicated by S. Hohmann

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Richman, T.J., Toenjes, K.A., Morales, S.E. et al. Analysis of cell-cycle specific localization of the Rdi1p RhoGDI and the structural determinants required for Cdc42p membrane localization and clustering at sites of polarized growth. Curr Genet 45, 339–349 (2004). https://doi.org/10.1007/s00294-004-0505-9

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