Patent ID: 8759044
Filing Date: 2014-06-24
Classification: A23K,C12N,C12P,Y02E

Abstract:
1. A method comprising: (a) providing a fermentation medium comprising fermentable carbon substrate derived from a biomass feedstock and an alcohol-producing yeast microorganism wherein the alcohol-producing microorganism comprises an engineered polynucleotide encoding a polypeptide having lipase activity and the microorganism expresses and displays or secretes said polypeptide such that the lipase activity is present in the fermentation medium, wherein the alcohol-producing microorganism further comprises reduced or eliminated pyruvate decarboxylase activity, and wherein the microorganism ferments the fermentable carbon substrate to produce alcohol, wherein the alcohol is a C (b) contacting the fermentation medium with a carboxylic acid wherein the lipase activity is present in the fermentation medium in sufficient amount to convert at least a portion of the alcohol produced by the microorganism to alcohol esters extracellularly.