Cloning of Wheat LTP1500 and Two Fusarium culmorum Hydrophobins in Saccharomyces cerevisiae and Assessment of Their Gushing Inducing Potential in Experimental
Michael W. Zapf1, Simone Theisen1, Rudi F. Vogel1 and Ludwig Niessen1,2
1 Lehrstuhl für Technische Mikrobiologie, TU München, Freising, Germany.
2 Corresponding author. E-mail: niessen@wzw.tum.de
J. Inst. Brew. 112(3), 237–245, 2006 | VIEW ARTICLE
ABSTRACT
The potential of surface active proteins to affect gushing upon their formation in situ during fermentation was investigated. This was achieved by cloning the genes of two hydrophobins ofF. culmorum and of a wheat lipid transfer protein (LTP1500) in Saccharomyces cerevisiae, with expression of these genes under control of the constitutive TPI (triose phosphate isomerase) promoter. The transgenic yeast clones were used for fermentation of wort. The resulting beers were bottled and examined for the occurrence of gushing. Gushing was induced by the class II hydrophobin FcHyd5p of the fungus F. culmorumv, found in naturally occurring cases of gushing worldwide.
Key words:
beer, Fusarium, gushing, hydrophobins, LTP, yeast.
Publication no. G-2006-1013-455 ©2006 The Institute & Guild of Brewing