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As they carry the same receptor populations as sensitive cells, killer yeast cells need-in contrast to various bacterial toxin producers-a specialized immunity mechanism. The ionophoric killer toxin K1 leads to the formation of cation-specific pores in the plasma membrane of sensitive yeast cells. Based on the data generated in this study, we were able to update the current model of toxin processing, validating the temporary inactivation of the toxic α subunit during maturation in the secretory pathway of the killer yeast. Copyright © 20