Improving fatty acids production by engineering dynamic pathway regulation and metabolic control

Peng Xu, Lingyun Li, Fuming Zhang, Gregory Stephanopoulos, Mattheos Koffas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

300 Scopus citations

Abstract

Global energy demand and environmental concerns have stimulated increasing efforts to produce carbon-neutral fuels directly from renewable resources. Microbially derived aliphatic hydrocarbons, the petroleum-replica fuels, have emerged as promising alternatives to meet this goal. However, engineering metabolic pathways with high productivity and yield requires dynamic redistribution of cellular resources and optimal control of pathway expression. Here we report a genetically encoded metabolic switch that enables dynamic regulation of fatty acids (FA) biosynthesis in Escherichia coli. The engineered strains were able to dynamically compensate the critical enzymes involved in the supply and consumption of malonyl-CoA and efficiently redirect carbon flux toward FA biosynthesis. Implementation of this metabolic control resulted in an oscillatory malonyl-CoA pattern and a balanced metabolism between cell growth and product formation, yielding 15.7- and 2.1-fold improvement in FA titer compared with the wild-type strain and the strain carrying the uncontrolled metabolic pathway. This study provides a new paradigm in metabolic engineering to control and optimize metabolic pathways facilitating the high-yield production of other malonyl-CoA-derived compounds.

Original languageEnglish
Pages (from-to)11299-11304
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume111
Issue number31
DOIs
StatePublished - 5 Aug 2014
Externally publishedYes

Keywords

  • Biofuels
  • Dynamic metabolic control
  • Transcriptional regulation

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