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FLO11-based model for air-liquid interfacial biofilm formation by Saccharomyces cerevisiae

Zara, Severino and Bakalinsky, Alan Tagore and Zara, Giacomo and Pirino, Giorgia and Demontis, Maria Antonietta and Budroni, Marilena (2005) FLO11-based model for air-liquid interfacial biofilm formation by Saccharomyces cerevisiae. Applied and Environmental Microbiology, Vol. 71 (6), p. 2934-2939. eISSN 1098-5336. Article.

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DOI: 10.1128/AEM.71.6.2934-2939.2005


Sardinian wine strains of Saccharomyces cerevisiae used to make sherry-like wines form a biofilm at the air-liquid interface at the end of ethanolic fermentation, when grape sugar is depleted and further growth becomes dependent on access to oxygen. Here, we show that FLO11, which encodes a hydrophobic cell wall glycoprotein, is required for the air-liquid interfacial biofilm and that biofilm cells have a buoyant density greater than the suspending medium. We propose a model for biofilm formation based on an increase in cell surface hydrophobicity occurring at the diauxic shift. This increase leads to formation of multicellular aggregates that effectively entrap carbon dioxide, providing buoyancy. A visible biofilm appears when a sufficient number of hydrophobic cell aggregates are carried to and grow on the liquid surface.

Item Type:Article
ID Code:4964
Uncontrolled Keywords:FLO11, Saccharomyces cerevisiae, Sardinian wine, interfacial biofilm
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:American Society for Microbiology
Deposited On:25 Nov 2010 12:06

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