P3 Pathway compartmentalization in peroxisome of saccharomyces cerevisiae to produce versatile medium chain fatty alcohols
Sunday, July 24, 2016
Grand Ballroom, 5th Fl (Sheraton New Orleans)
J. Sheng*, X. Feng and J. Stevens, Virginia Polytechnic Institute and State University, Blacksburg, VA
Fatty alcohols are value-added chemicals and important components of a variety of industries, which have a more than 3 billion-dollar global market annually. Long chain fatty alcohols (>C12) are mainly used in surfactants, lubricants, detergents, pharmaceuticals and cosmetics while medium chain fatty alcohols (C6-C12) could be used as diesel-like biofuels. Microbial production of fatty alcohols from renewable feedstock stands as a promising strategy to enable sustainable supply of fatty alcohols. For the first time, we report that medium chain fatty alcohols could be produced in yeast via targeted expression of fatty acyl-CoA reductase (TaFAR) in the peroxisome of Saccharomyces cerevisiae. By tagging TaFAR enzyme with peroxisomal targeting signal peptides, the TaFAR could be compartmentalized into the matrix of the peroxisome to hijack the medium chain fatty acyl-CoA generated from the beta-oxidation pathway and convert them to versatile medium chain fatty alcohols (C10 & C12). The overexpression of genes encoding PEX7 and acetyl-CoA carboxylase further improved fatty alcohol production by 1.4-fold. After medium optimization, fatty alcohols were produced at 1.3 g/L in fed-batch fermentation using glucose as the sole carbon source, including 6.9% 1-decanol, 27.5% 1-dodecanol, 2.9% 1-tetradecanol and 62.7% 1-hexadecanol. This work revealed that peroxisome could be engineered as a compartmentalized cell factory for producing versatile fatty acid-derived chemicals in S. cerevisiae.