title: The Awa1 gene is required for the foam-forming phenotype and cell surface hydrophobicity of sake yeast.
abstract: Sake, a traditional alcoholic beverage in Japan, is brewed with sake yeasts, which are classified as Saccharomyces cerevisiae. Almost all sake yeasts form a thick foam layer on sake mash during the fermentation process because of their cell surface hydrophobicity, which increases the cells' affinity for bubbles. To reduce the amount of foam, nonfoaming mutants were bred from foaming sake yeasts. Nonfoaming mutants have hydrophilic cell surfaces and no affinity for bubbles. We have cloned a gene from a foam-forming sake yeast that confers foaming ability to a nonfoaming mutant. This gene was named AWA1 and structures of the gene and its product were analyzed. The N- and C-terminal regions of Awa1p have the characteristic sequences of a glycosylphosphatidylinositol anchor protein. The entire protein is rich in serine and threonine residues and has a lot of repetitive sequences. These results suggest that Awa1p is localized in the cell wall. This was confirmed by immunofluorescence microscopy and Western blotting analysis using hemagglutinin-tagged Awa1p. Moreover, an awa1 disruptant of sake yeast was hydrophilic and showed a nonfoaming phenotype in sake mash. We conclude that Awa1p is a cell wall protein and is required for the foam-forming phenotype and the cell surface hydrophobicity of sake yeast.
authors.affiliation: National Research Institute of Brewing, 3-7-1, Kagamiyama, Higashihiroshima 739-0046, Japan. simoi@nrib.go.jp
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Shimoi
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Masaki
authors.initials: M
authors.lastname: Okuda
authors.forename: Ratchanee
authors.initials: R
authors.lastname: Atthi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Iwashita
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ito
mesh_terms: D000595:Amino Acid Sequence; D002473:Cell Wall / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D017353:Gene Deletion; D057927:Hydrophobic and Hydrophilic Interactions; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D012275:Oryza / Q000382:microbiology*; D010641:Phenotype; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism; D017422:Sequence Analysis, DNA; D013499:Surface Properties; D014920:Wine / Q000382:microbiology*
chemical_list: C459182:AWA1 protein, S cerevisiae; D005656:Fungal Proteins; D008565:Membrane Proteins; D029701:Saccharomyces cerevisiae Proteins