title: Acetyltransferase SAS2 and sirtuin SIR2, respectively, control flocculation and biofilm formation in wine yeast.
abstract: Cell-to-cell and cell-to-environment interactions of microorganisms are of substantial relevance for their biotechnological use. In the yeast Saccharomyces cerevisiae, flocculation can be an advantage to clarify final liquid products after fermentation, and biofilm formation may be relevant for the encapsulation of strains of interest. The adhesion properties of wine yeast strains can be modified by the genetic manipulation of transcriptional regulatory proteins, such as histone deacetylases, and acetylases. Sirtuin SIR2 is essential for the formation of mat structures, a kind of biofilm that requires the expression of cell-wall protein FLO11 as its deletion reduces FLO11 expression, and adhesion of cells to themselves and to agar in a commercial wine strain. Deletion of acetyltransferase GCN5 leads to a similar phenotype. A naturally flocculant wine yeast strain called P2 was characterized. Its flocculation happens only during grape juice fermentation and is due to the presence of a highly transcribed version of flocculin FLO5, linked to the presence of a δ sequence in the promoter. Deletion of acetyltransferase SAS2 enhances this phenotype and maltose fermentation even more. Therefore, the manipulation of acetylation/deacetylation machinery members is a valid way to alter the interaction of industrial yeast to their environment.
authors.affiliation: Laboratorio de MicrobiologÍa Enológica, Facultad de Ciencias, Universidad de Cádiz, Puerto Real, Cádiz, Spain.
authors.forename: María E
authors.initials: ME
authors.lastname: Rodriguez
authors.forename: Helena
authors.initials: H
authors.lastname: Orozco
authors.forename: Jesús M
authors.initials: JM
authors.lastname: Cantoral
authors.forename: Emilia
authors.initials: E
authors.lastname: Matallana
authors.forename: Agustín
authors.initials: A
authors.lastname: Aranda
mesh_terms: D000483:Alleles; D018441:Biofilms; D005285:Fermentation; D005427:Flocculation; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D051548:Histone Acetyltransferases / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D056565:Sirtuin 2 / Q000235:genetics* / Q000378:metabolism; D014920:Wine; D000099224:p300-CBP-Associated Factor
chemical_list: D051548:Histone Acetyltransferases; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D056565:Sirtuin 2; C501392:GCN5 protein, S cerevisiae; D000099224:p300-CBP-Associated Factor; C469266:Sas2 protein, S cerevisiae; C087778:SIR2 protein, S cerevisiae
keywords: FLO5; SAS2; SIR2; biofilm; flocculation; wine yeast