title: Influence of carbon source and surface hydrophobicity on the aggregation of the yeast Kluyveromyces bulgaricus.
abstract: Aggregation of the yeast Kluyveromyces bulgaricus is mediated by the galactose-specific lectin KbCWL1. This lectin contains hydrophobic amino acids and its activity is calcium dependent. A specific fluorescent probe, 1-anilinonaphthalene-8-sulfonic acid in the free acid form (ANS; Sigma Chemical Co., St. Louis, Missouri), was used to study the hydrophobic areas on the cellular surface of K. bulgaricus. Changes in surface hydrophobicity during the growth and aggregation of yeast cells were studied. Surface hydrophobicity increased during growth and depended on the amount of yeast cells in the culture medium. During growth, the size of the hydrophobic areas on the cell surface was measured using ANS and was found to increase with the percentage of flocculating yeasts. Our results strongly suggest that the hydrophobic areas of the cell walls of yeast cells are involved in the aggregation of K. bulgaricus.
authors.affiliation: LCPME UMR 7564 CNRS-UHP Nancy, France.
authors.forename: F
authors.initials: F
authors.lastname: Thiebault
authors.forename: J
authors.initials: J
authors.lastname: Coulon
mesh_terms: D000817:Anilino Naphthalenesulfonates / Q000378:metabolism; D002244:Carbon / Q000378:metabolism*; D002448:Cell Adhesion; D003470:Culture Media; D005427:Flocculation; D005456:Fluorescent Dyes / Q000378:metabolism; D057927:Hydrophobic and Hydrophilic Interactions; D007716:Kluyveromyces / Q000254:growth & development / Q000502:physiology*; D013499:Surface Properties
chemical_list: D000817:Anilino Naphthalenesulfonates; D003470:Culture Media; D005456:Fluorescent Dyes; C027132:1-anilino-8-naphthalenesulfonate; D002244:Carbon