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Signaling of human Frizzled receptors to the yeast mating pathway is particularly interesting from the evolutionary perspective: Our results suggest that the archetypic GPCR signal transduction machinery of the yeast S. cerevisiae may be related to Frizzled signaling in animals.
The mating pathway is activated in haploid cells in response to pheromone (a- or α-factor).
Another important branch of the mating pathway is the MAPK (mitogen-activated protein kinase) signaling system [ 26, 27].
It is therefore not surprising that the mating pathway is induced in this yeast when nutrients become more limiting.
A previous study has shown that the mating pathway is defective in Hsp90 mutant cells (Louvion et al. 1998).
It is indeed well-established that the signaling activity in the mating pathway is dependent on the cell cycle stage [ 26– 28].
Similar(54)
We investigated how the mating pathway was influenced by different levels of the Hsp90 activity.
Assuming that an analogous mating pathway was present in the ancestor of eukaryotes (discussed below) and that both alphaproteobacterial and archaeal populations were densely packed in a biofilm, it is conceivable that an alphaproteobacterium was "sandwiched" and enclosed between fusing archaeal cells.
The mating (MAT) pathway is active in haploids, in which mating type specific receptors respond to pheromones from cells with the complementary mating type (reviewed in [ 16]).
Indeed, the mating MAPK pathway is activated by an analogous mechanism, i.e., by pheromone-induced association of Ste20 and Ste11 (Pryciak and Huntress 1998; Lamson et al. 2002).
In yeast, GPCRs control the mating pathway that is used for sexual reproduction (reviewed in [11]).
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