| Title: | A Cdc24p-Far1p-Gbetagamma protein complex required for yeast orientation during mating |
| Address: | "Division of Cell Biology, MRC Laboratory of Molecular Biology, Cambridge, CB2 2QH, United Kingdom" |
| ISSN/ISBN: | 0021-9525 (Print) 1540-8140 (Electronic) 0021-9525 (Linking) |
| Abstract: | "Oriented cell growth requires the specification of a site for polarized growth and subsequent orientation of the cytoskeleton towards this site. During mating, haploid Saccharomyces cerevisiae cells orient their growth in response to a pheromone gradient overriding an internal landmark for polarized growth, the bud site. This response requires Cdc24p, Far1p, and a heterotrimeric G-protein. Here we show that a two- hybrid interaction between Cdc24p and Gbeta requires Far1p but not pheromone-dependent MAP-kinase signaling, indicating Far1p has a role in regulating the association of Cdc24p and Gbeta. Binding experiments demonstrate that Cdc24p, Far1p, and Gbeta form a complex in which pairwise interactions can occur in the absence of the third protein. Cdc24p localizes to sites of polarized growth suggesting that this complex is localized. In the absence of CDC24-FAR1-mediated chemotropism, a bud site selection protein, Bud1p/Rsr1p, is essential for morphological changes in response to pheromone. These results suggest that formation of a Cdc24p-Far1p-Gbetagamma complex functions as a landmark for orientation of the cytoskeleton during growth towards an external signal" |
| Keywords: | Amino Acid Sequence Binding Sites Cell Cycle Cell Cycle Proteins/chemistry/*metabolism Cyclin-Dependent Kinase Inhibitor Proteins Cytoskeleton/metabolism Fungal Proteins/chemistry/genetics/*metabolism *GTP-Binding Protein beta Subunits *GTP-Binding Protei; |
| Notes: | "MedlineNern, A Arkowitz, R A eng Research Support, Non-U.S. Gov't 1999/03/24 J Cell Biol. 1999 Mar 22; 144(6):1187-202. doi: 10.1083/jcb.144.6.1187" |
