*Brettanomyces, a genus of yeast known for its role in the fermentation of sour beers and other specialty beverages, produces tetrahydropyridines (THPs), which contribute to distinct aromas often described as 'mousy' or reminiscent of rodent urine. These aromas are generally considered off-flavors at high concentrations but can add complexity in small amounts. The mechanism by which *Brettanomycesproduces THPs involves the enzymatic conversion of lysine, an amino acid, through a series of steps. The key intermediate in this pathway is Δ1-piperideine, which is formed from lysine via ....
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