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. 1982 Oct;79(20):6147–6150. doi: 10.1073/pnas.79.20.6147

Yeast invertase polymorphism is correlated with variable states of oligosaccharide chain phosphorylation.

J Frevert, C E Ballou
PMCID: PMC347076  PMID: 6755465

Abstract

Saccharomyces cerevisiae invertase (EC 3.2.1.26) isolated from wild-type strain X2180 can be resolved by isoelectric focusing into at least seven bands revealed by an activity stain. Most of this polymorphism is eliminated in mutants that are defective in phosphorylation of the mannoprotein carbohydrate chains (mnn4 and mnn6). In contrast to strain X2180, invertase from the mnn9 mutant, which makes mannoprotein lacking the outer portion of the polymannose chains, shows only two major bands on isoelectric focusing. Although mnn2 mannoprotein is though not to have any branches in its outer chain, the invertase of this mutant shows at least six bands on isoelectric focusing, and digestion of this invertase with an endo-alph aI leads to 6-mannanase that removes the unbranched outer chain produces an invertase with two bands that are similar to those from the mnn9 mutant. The invertase from mnn2 cells, grown with [32P]orthophosphate and precipitated with specific antiserum, gives at least five radioactive bands on isoelectric focusing, and after digestion with the endomannanase the radioactivity no longer migrates with the residual invertase. Mutants with shortened and unbranched outer chains (mnn2 mnn7, mnn2 mnn8, and mnn2 mnn10) give invertase patterns similar to mnn2. The results suggest that multiple states of outer chain phosphorylation lead to isoelectric polymorphism of S. cerevisiae external invertase and, because invertase has nine carbohydrate chains, no more than one phosphate group per chain would be required to account for this property.

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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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