Biology / Unit 4 Bio 0825 short lesson, about 20 seconds
Signaling in Yeast
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The idea
Budding yeast cells signal mating partners by secreting mating factor, a ligand binding cell-surface receptors that halts the recipient's growth cycle to prepare for mating.
In practice
A yeast cell receiving mating factor activates protein kinases and GTP-binding proteins resembling multicellular G-protein signaling.
Where people slip
Single-celled eukaryotes use cell-surface receptor signaling like an animal cell — communication did not begin with multicellularity.
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