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. 1994 Oct;62(10):4564–4571. doi: 10.1128/iai.62.10.4564-4571.1994

Binding of the extracellular matrix component entactin to Candida albicans.

J L López-Ribot 1, W L Chaffin 1
PMCID: PMC303144  PMID: 7927722

Abstract

We have investigated the interaction between Candida albicans and entactin, a recently characterized glycoprotein present in the extracellular matrix, especially in the basement membrane. Organisms of both the yeast and the hyphal morphologies of the fungus had the ability to bind recombinant entactin, as detected by an indirect immunofluorescence assay. Material present in the 2-mercaptoethanol cell wall extracts from both C. albicans growth forms was capable of binding to immobilized recombinant entactin in a dose-dependent manner. Binding to entactin was approximately twice that observed for laminin. Binding of an extract component(s) to entactin was partially inhibited by an Arg-Gly-Asp-Ser peptide. A polyclonal antientactin antiserum, as well as a pooled antiserum preparation raised against components present in different C. albicans cell wall extracts, completely or almost completely abolished binding. The existence of morphology-specific receptor-like molecules which bind to different domains of the entactin molecule was ruled out in a competition binding assay. The entactin-binding material(s) in the cell wall also displayed some ability to bind laminin and fibronectin, since preadsorption in the presence of these extracellular matrix components resulted in reduction of binding to entactin. Moieties with a molecular mass of approximately 25, 44, and 65 kDa present in the 2-mercaptoethanol cell wall extracts from both blastoconidia and germ tubes were detected in a ligand affinity blotting experiment as having the ability to bind entactin. Interactions between C. albicans and entactin could be important in mediating adhesion of the fungus to the host tissues and may play a role in the establishment of the disseminated form of the disease.

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Selected References

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