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J Bacteriol. Jul 1997; 179(13): 4096–4105.
PMCID: PMC179227

Cloning of the Candida albicans homolog of Saccharomyces cerevisiae GSC1/FKS1 and its involvement in beta-1,3-glucan synthesis.

Abstract

Saccharomyces cerevisiae GSC1 (also called FKS1) and GSC2 (also called FKS2) have been identified as the genes for putative catalytic subunits of beta-1,3-glucan synthase. We have cloned three Candida albicans genes, GSC1, GSL1, and GSL2, that have significant sequence homologies with S. cerevisiae GSC1/FKS1, GSC2/FKS2, and the recently identified FKSA of Aspergillus nidulans at both nucleotide and amino acid levels. Like S. cerevisiae Gsc/Fks proteins, none of the predicted products of C. albicans GSC1, GSL1, or GSL2 displayed obvious signal sequences at their N-terminal ends, but each product possessed 10 to 16 potential transmembrane helices with a relatively long cytoplasmic domain in the middle of the protein. Northern blotting demonstrated that C. albicans GSC1 and GSL1 but not GSL2 mRNAs were expressed in the growing yeast-phase cells. Three copies of GSC1 were found in the diploid genome of C. albicans CAI4. Although we could not establish the null mutation of C. albicans GSC1, disruption of two of the three GSC1 alleles decreased both GSC1 mRNA and cell wall beta-glucan levels by about 50%. The purified C. albicans beta-1,3-glucan synthase was a 210-kDa protein as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and all sequences determined with peptides obtained by lysyl endopeptidase digestion of the 210-kDa protein were found in the deduced amino acid sequence of C. albicans Gsc1p. Furthermore, the monoclonal antibody raised against the purified beta-1,3-glucan synthase specifically reacted with the 210-kDa protein and could immunoprecipitate beta-1,3-glucan synthase activity. These results demonstrate that C. albicans GSC1 is the gene for a subunit of beta-1,3-glucan synthase.

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Selected References

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