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We previously reported that the defects in the Saccharomyces cerevisiae cwh6 Calcofluor white-hypersensitive cell wall mutant are caused by a mutation in SPT14/GPI3, a gene involved in glycosylphosphatidylinositol (GPI) anchor biosynthesis. Here we describe the effect of cwh6/spt14/gpi3 on the biogenesis of cell wall proteins. It was found that the release of precursors of cell wall proteins from the endoplasmic reticulum (ER) was retarded. This was accompanied by proliferation of ER structures. The majority of the cell wall protein precursors that eventually left the ER were not covalently incorporated into the cell wall but were secreted into the growth medium. Despite the inefficient incorporation of cell wall proteins, there was no net effect on the protein level in the cell wall. It is postulated that the availability of GPI-dependent cell wall proteins determines the rate of cell wall construction and limits growth rate.

Restrictive glycosylphosphatidylinositol anchor synthesis in cwh6/gpi3 yeast cells causes aberrant biogenesis of cell wall proteins