Small rho-like GTPase, essential for establishment and maintenance of cell polarity; mutants have defects in the organization of actin and septins; Involved in development of cell polarity during the cell division cycle, and essential for bud emergence. Affects signaling in the pheromone-response pathway through the STE20 protein kinase. Negatively regulated by the GTPase-activating proteins RGA1, BEM3, and BEM4 (191 aa)

Protein that induces appearance of [PIN+] prion when overproduced; predicted to be palmitoylated; Not known. Seems to be able to provoque the non- Mendelian trait [PIN(+)] which is required for the de novo appearance of the [PSI(+)] prion (282 aa)

Mitogen-activated kinase kinase involved in protein kinase C signaling pathway that controls cell integrity; upon activation by Bck1p phosphorylates downstream target, Slt2p; functionally redundant with Mkk2p; Involved in a signal transduction pathway that play a role in yeast cell morphogenesis and cell growth. This pathway seems to start by SMP3; then involve the kinase PKC1 that may act on the BCK1 kinase that then phosphorylates MKK1 and MKK2 which themselves phosphorylate the MPK1 kinase (508 aa)

Rho GTPase activating protein (RhoGAP), stimulates the intrinsic GTPase activity of Rho1p, which plays a role in actin cytoskeleton organization and control of cell wall synthesis; structurally and functionally related to Sac7p; Acts in signal transduction. Activates RHO1 (409 aa)

Cdc42p-activated signal transducing kinase of the PAK (p21-activated kinase) family; involved in pheromone response, pseudohyphal/invasive growth, vacuole inheritance, down-regulation of sterol uptake; GBB motif binds Ste4p; MAP4K component of the MAPK pathway required for the mating pheromone response, haploid invasive growth and diploid pseudohyphal development. Links the pheromone response G-protein beta gamma subunits to downstream signaling components. Needed for mating in haploid cells, induction of a mating-specific gene FUS1, induction of mating-specific morphologies, and phero [...] (939 aa)

Protein kinase; implicated in proteasome function; interacts with TORC1, Ure2 and Gdh2; overexpression leads to hypersensitivity to rapamycin and nuclear accumulation of Gln3; epitope-tagged protein localizes to the cytoplasm; Serine/threonine-protein kinase involved in the phosphorylation of the NAD(+)-dependent glutamate dehydrogenase GDH2. When overexpressed, confers hypersensitivity to rapamycin and induces rapid nuclear accumulation of GLN3 to activate the transcription of nitrogen-regulated genes (928 aa)

GTPase-activating protein for the polarity-establishment protein Cdc42p; implicated in control of septin organization, pheromone response, and haploid invasive growth; regulated by Pho85p and Cdc28p; GTPase-activating protein (GAP) for CDC42 and/or RHO1 (1009 aa)

GTPase activating protein (GAP) for Rho1p, involved in signaling to the actin cytoskeleton, null mutations suppress tor2 mutations and temperature sensitive mutations in actin; potential Cdc28p substrate; GTPase-activating protein for RHO1. Must be involved in the normal assembly or function or both of actin. Plays an essential role only at low temperatures (654 aa)