Tip1p is one of the major cell wall mannoproteins of Saccharomyces cerevisiae and is presumed to be synthesized as a glycosylphosphatidylinositol (GPI)-anchored form. We purified Tip1p from a glucanase extract of yeast cell walls and analyzed the sugar chain involved in the cell wall linkage. One mol of glucanase-extracted Tip1p contained 7.5 mol of glucose derived from glucan and 1 mol of ethanolamine, a component of the GPI anchor. One mol of the C-terminal peptide of Tip1p digested with Achromobacter protease I also contained 7.9 mol of glucose and 1 mol of ethanolamine. On the other hand, Tip1p contained no glucosamine, which is a component of the GPI anchor. The glucan-binding sugar chain of Tip1p was released by hydrazinolysis and isolated. This sugar chain contained ethanolamine with a free amino group and a glucose reducing end, but no mannose reducing end. Phosphodiesterase treatment eliminated the free amino group from this sugar chain, suggesting that a phosphodiester bond exists between the ethanolamine and the glucan remnant. These results indicate (1) the glucan-binding sugar chain of Tip1p is a GPI derivative, and (2) the GPI anchor is cleaved at the glycosyl moiety, and the resultant mannose reducing end is probably used to link Tip1p to cell wall glucan.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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