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. 1975 Oct;124(1):127–133. doi: 10.1128/jb.124.1.127-133.1975

Site of initial glycosylation of mannoproteins from Saccharomyces cerevisiae.

J Ruiz-Herrera, R Sentandreu
PMCID: PMC235873  PMID: 240803

Abstract

The cellular site of initial glycosylation of proteins from Saccharomyces cerevisiae has been studied. Short pulses of [U-14C]mannose label the ribosomal fraction of the yeast. Most of the label was associated with polysomes; monosomes contained only a small amount of radioactivity. All of the radioactivity present in the polysomal fraction was accounted by mannose and smaller amounts of glucose and glucosamine. Puromycin treatment detached more than 50% of the radioactivity from the polysomes; treatment of polysomes at pH 10.0 also caused the release of radioactivity. These results indicate that initial sugar binding occurs while the nascent polypeptide chains are still growing on the ribosomes. When the cells were preincubated with 2-deoxy-D-glucose, incorporation of [U-14C]mannose into the polysomes and the cell wall was inhibited, whereas its incorporation into membrane fractions was unimpaired. It was concluded that 2-deoxy-D-glucose inhibited the synthesis of glycoproteins by interference with the initial glycosylation steps at the ribosomal level.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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