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. 1988 Aug 11;16(15):7499–7511. doi: 10.1093/nar/16.15.7499

A novel yeast secretion signal isolated from 28K killer precursor protein encoded on the linear DNA plasmid pGKL1.

M Tokunaga 1, N Wada 1, F Hishinuma 1
PMCID: PMC338423  PMID: 3045759

Abstract

Saccharomyces cerevisiae harboring linear dsDNA plasmids, pGKL1 and pGKL2, secretes a killer toxin consisting of 97, 31 and 28 kilodalton subunits (Nucleic Acids Res., 15, 1031-1046, 1987). We isolated the DNA encoding the N-terminal pre-sequence of the 28K precursor protein and constructed a new secretion vector in S. cerevisiae. Mouse alpha-amylase fused to the 28K signal sequence was secreted into the culture medium with a high efficiency similar to those fused to the mating factor alpha and 97K-31K killer signal sequences. This data clearly indicates that 28K presequence functions as a secretion signal. Glycosylated and nonglycosylated alpha-amylase molecules were detected in the culture medium. The secretion of alpha-amylase was blocked by sec18-1 mutation. The secreted alpha-amylase recovered from the medium was found to migrate faster in SDS-polyacrylamide gel than the precursor form of alpha-amylase synthesized in vitro. These lines of evidence suggest that mouse alpha-amylase fused to 28K killer signal sequence was processed, glycosylated and secreted through the normal secretion pathway of the yeast.

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Selected References

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