title: Cloning and characterization of the beer foaming gene CFG1 from Saccharomyces pastorianus.
abstract: Foam production is an essential characteristic of beer, generated mainly from the proteins present in the malt and, to a minor extent, from the mannoproteins in brewer's yeast cell walls. Here, we describe the isolation and characterization of the novel fermentation gene CFG1 (Carlsbergensis foaming gene) from Saccharomyces pastorianus. CFG1 encodes the cell wall protein Cfg1p, a 105 kDa protein highly homologous to Saccharomyces cerevisiae cell wall mannoproteins, particularly those involved in foam formation, such as Awa1p and Fpg1p. Further characterization of Cfg1p revealed that this novel protein is responsible for beer foam stabilization. This report represents the first time that a brewing yeast foaming gene has been cloned and its action fully characterized.
authors.affiliation: Department of Microbiology, School of Biotechnology, Faculty of Pharmacy, University of Santiago de Compostela, 15782, Spain.
authors.forename: Lucía
authors.initials: L
authors.lastname: Blasco
authors.forename: Patricia
authors.initials: P
authors.lastname: Veiga-Crespo
authors.forename: Angeles
authors.initials: A
authors.lastname: Sánchez-Pérez
authors.forename: Tomás G
authors.initials: TG
authors.lastname: Villa
mesh_terms: D000595:Amino Acid Sequence; D001515:Beer / Q000032:analysis / Q000382:microbiology*; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D008969:Molecular Sequence Data; D012440:Saccharomyces / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D005656:Fungal Proteins