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Saccharomyces cerevisiae exhibits polarized growth during two phases of its life cycle, budding and mating. The site for polarization during vegetative growth is determined genetically: a and alpha haploid cells exhibit an axial budding pattern, and a/alpha diploid cells exhibit a bipolar pattern. During mating, each cell polarizes towards its partner to ensure efficient mating. SPA2 is required for the bipolar budding pattern (Snyder. M 1989. J. Cell Biol. 108:1419-1429; Zahner, J.A., H.A. Harkins, and J.R. Pringle. 1996. Mol. Cell. Biol. 16:1857-1870) and polarization during mating (Snyder, M., S. Gehrung, and B.D. Page. 1991. J. Cell Biol. 114: 515-532). We previously identified mutants defective in PEA2 and SPA2 which alter cell polarization in the presence of mating pheromone in a similar manner (Chenevert, J., N. Valtz, and I. Herskowitz. 1994. Genetics, 136:1287-1297). Here we report the further characterization of these mutants. We have found that PEA2 is also required for the bipolar budding pattern and that it encodes a novel protein with a predicted coiled-coil domain. Pea2p is expressed in all cell types and is localized to sites of polarized growth in budding and mating cells in a pattern similar to Spa2p, Pea2p and Spa2p exhibit interdependent localization: Spa2p is produced in pea2 mutants but fails to localize properly; Pea2p is not stably produced in spa2 mutants. These results suggest that Pea2p and Spa2p function together as a complex to generate the bipolar budding pattern and to guarantee proper polarization during mating.

Pea2 protein of yeast is localized to sites of polarized growth and is required for efficient mating and bipolar budding.