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. 1997 Oct;179(20):6279–6284. doi: 10.1128/jb.179.20.6279-6284.1997

Altered extent of cross-linking of beta1,6-glucosylated mannoproteins to chitin in Saccharomyces cerevisiae mutants with reduced cell wall beta1,3-glucan content.

J C Kapteyn 1, A F Ram 1, E M Groos 1, R Kollar 1, R C Montijn 1, H Van Den Ende 1, A Llobell 1, E Cabib 1, F M Klis 1
PMCID: PMC179540  PMID: 9335273

Abstract

The yeast cell wall contains beta1,3-glucanase-extractable and beta1,3-glucanase-resistant mannoproteins. The beta1,3-glucanase-extractable proteins are retained in the cell wall by attachment to a beta1,6-glucan moiety, which in its turn is linked to beta1,3-glucan (J. C. Kapteyn, R. C. Montijn, E. Vink, J. De La Cruz, A. Llobell, J. E. Douwes, H. Shimoi, P. N. Lipke, and F. M. Klis, Glycobiology 6:337-345, 1996). The beta1,3-glucanase-resistant protein fraction could be largely released by exochitinase treatment and contained the same set of beta1,6-glucosylated proteins, including Cwp1p, as the B1,3-glucanase-extractable fraction. Chitin was linked to the proteins in the beta1,3-glucanase-resistant fraction through a beta1,6-glucan moiety. In wild-type cell walls, the beta1,3-glucanase-resistant protein fraction represented only 1 to 2% of the covalently linked cell wall proteins, whereas in cell walls of fks1 and gas1 deletion strains, which contain much less beta1,3-glucan but more chitin, beta1,3-glucanase-resistant proteins represented about 40% of the total. We propose that the increased cross-linking of cell wall proteins via beta1,6-glucan to chitin represents a cell wall repair mechanism in yeast, which is activated in response to cell wall weakening.

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Selected References

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