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@article{Yunus:2018:10.1016/j.ymben.2018.07.015,
author = {Yunus, IS and Jones, PR},
doi = {10.1016/j.ymben.2018.07.015},
journal = {Metabolic Engineering},
pages = {59--68},
title = {Photosynthesis-dependent biosynthesis of medium chain-length fatty acids and alcohols},
url = {http://dx.doi.org/10.1016/j.ymben.2018.07.015},
volume = {49},
year = {2018}
}
TY - JOUR
AB - Cyanobacteria can directly channel atmospheric CO2 into a wide range of versatile carbon products such as fatty acids and fatty alcohols with applications including fuel, cosmetics, and health products. Works on alcohol production in cyanobacteria have so far focused on either long (C12-C18) or short (C2-C4) chain-length products. In the present work, we report the first synthetic pathway for 1-octanol (C8) biosynthesis in Synechocystis sp. PCC 6803, employing a carboxylic acid reductase and C8-preferring fatty acyl-ACP thioesterase. The first engineered strain produced 1-octanol but exhibited poor productivity and cellular health issues. We therefore proceeded to systematically optimize the strain and cultivation conditions in order to understand what the limiting factors were. The identification of optimal promoters and ribosomal binding sites, in combination with isopropyl myristate solvent overlay, resulted in a combined (C8-OH and C10-OH) titer of more than 100mg/L (a 25-fold improvement relative to the first engineered strain) and a restoration of cellular health. Additionally, more than 905mg/L 1-octanol was produced when the strain expressing sfp (phosphopantetheinyl transferase) and car (carboxylic acid reductase) was fed with octanoic acid. A combination of feeding experiments and protein quantification indicated that the supply of octanoic acid from the introduced thioesterase, and possibly also native fatty acid synthesis pathway, were the main bottlenecks of the pathway.
AU - Yunus,IS
AU - Jones,PR
DO - 10.1016/j.ymben.2018.07.015
EP - 68
PY - 2018///
SN - 1096-7176
SP - 59
TI - Photosynthesis-dependent biosynthesis of medium chain-length fatty acids and alcohols
T2 - Metabolic Engineering
UR - http://dx.doi.org/10.1016/j.ymben.2018.07.015
UR - https://www.ncbi.nlm.nih.gov/pubmed/30055323
UR - http://hdl.handle.net/10044/1/63516
VL - 49
ER -
Climate Science
Earth and Life Sciences
Energy and Low-Carbon Futures
Resources and Pollution
Economics and Finance
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