Prepro-alpha-factor is a precursor to alpha-factor secreted by MAT alpha Saccharomyces cerevisiae, which is a small peptide mating pheromone. Prepro-alpha-factor is translocated into the

endoplasmic reticulum The endoplasmic reticulum (ER) is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits – rough endoplasmic reticulum ( ...

and glycosylated at three sites as part of the chemical reaction leading to the formation of the alpha-factor.

References

Pheromones Fungal proteins {{molecular-biology-stub