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. 1986 Dec;6(12):4274–4280. doi: 10.1128/mcb.6.12.4274

In vivo evidence for posttranslational translocation and signal cleavage of the killer preprotoxin of Saccharomyces cerevisiae.

S J Lolle, H Bussey
PMCID: PMC367209  PMID: 3540609

Abstract

A full-length cDNA of the M1 double-stranded RNA killer preprotoxin coding region successfully directed the synthesis of secreted K1 toxin when expressed in Saccharomyces cerevisiae from a plasmid vector. Three protein species immunoreactive with antitoxin antiserum were detected intracellularly in transformants harboring this killer cDNA plasmid. These toxin precursor species were characterized by using secretory-defective hosts, by comparative electrophoretic mobilities, and by tunicamycin susceptibility. Such studies indicate that these three protein species represent intermediates generated by signal cleavage of the preprotoxin and its subsequent glycosylation and provide evidence that these events occur posttranslationally.

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Selected References

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