Development of a genomic atlas for rational engineering of Saccharomyces cerevisiae aiming second-generation ethanol production

Abstract

Second generation ethanol (2G) is a promising fuel obtained from renewable sources. The development of efficient microbial strains capable of converting the five-carbon sugar xylose into ethanol is an essential step in the 2G ethanol technology. Our group pioneered the development and the commercial release of the first yeast currently employed in the Brazilian 2G industry. Despite the construction of engineered Saccharomyces cerevisiae strains for 2G ethanol production has been initiated decades ago, the identification of the genetic bases emerged during adaptive evolution processes, responsible for xylose assimilation and inhibitor tolerance, is still in its infancy and few information is available. The aim of this work is the development of a genomic atlas by means of the identification of molecular bases involved in the metabolism and regulation of xylose consumption and tolerance to inhibitors present in hydrolysates from lignocellulosic materials. The interactions found between these different metabolic pathways will allow a better comprehension of C5 metabolism and the complex signaling network that regulates the adaptation and tolerance to groups of inhibitory molecules. The technologies developed in this work will be used in the rational design of strains suitable for use in the production of 2G ethanol, making its production viable, assisting Brazil in leading the development of renewable biofuels. (AU)