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Partitioning metabolism between growth and product synthesis for coordinated production of wax esters in Acinetobacter baylyi ADP1
Author(s) -
Santala Suvi,
Santala Ville,
Liu Nian,
Stephanopoulos Gregory
Publication year - 2021
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.27740
Subject(s) - metabolic engineering , biochemistry , metabolism , biosynthesis , glyoxylate cycle , chemistry , cell growth , synthetic biology , lipid metabolism , biology , enzyme , computational biology
Microbial storage compounds, such as wax esters (WE), are potential high‐value lipids for the production of specialty chemicals and medicines. Their synthesis, however, is strictly regulated and competes with cell growth, which leads to trade‐offs between biomass and product formation. Here, we use metabolic engineering and synergistic substrate cofeeding to partition the metabolism of Acinetobacter baylyi ADP1 into two distinct modules, each dedicated to cell growth and WE biosynthesis, respectively. We first blocked the glyoxylate shunt and upregulated the WE synthesis pathway to direct the acetate substrate exclusively for WE synthesis, then we controlled the supply of gluconate so it could be used exclusively for cell growth and maintenance. We show that the two modules are functionally independent from each other, allowing efficient lipid accumulation while maintaining active cell growth. Our strategy resulted in 7.2‐ and 4.2‐fold improvements in WE content and productivity, respectively, and the product titer was enhanced by 8.3‐fold over the wild type strain. Notably, during a 24‐h cultivation, a yield of 18% C‐WE/C‐total‐substrates was achieved, being the highest reported for WE biosynthesis. This study provides a simple, yet powerful, means of controlling cellular operations and overcoming some of the fundamental challenges in microbial storage lipid production.