Partitioning metabolism between growth and product synthesis for coordinated production of wax esters in Acinetobacter baylyi ADP1

Santala, Suvi; Santala, Ville; Liu, Nian; Stephanopoulos, Gregory

doi:10.1002/bit.27740

Title: Partitioning metabolism between growth and product synthesis for coordinated production of wax esters in Acinetobacter baylyi ADP1

Journal Article · Thu Mar 25 00:00:00 UTC 2021 · Biotechnology and Bioengineering

DOI: https://doi.org/10.1002/bit.27740 · OSTI ID:1786103

^[1]; Santala, Ville ^[1]; Liu, Nian ^[2]; Stephanopoulos, Gregory ^[2]

Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA, Faculty of Engineering and Natural Sciences Tampere University Tampere Finland
Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA

Abstract 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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0008744

OSTI ID:: 1786103

Journal Information:: Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 6 Vol. 118; ISSN 0006-3592

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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