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Triggering the stringent response enhances synthetic methanol utilization in Escherichia coli

Journal Article · · Metabolic Engineering
 [1];  [2];  [3];  [2];  [2];  [3];  [2]
  1. Univ. of Delaware, Newark, DE (United States). Delaware Biotechnology Inst.; University of Delaware
  2. Univ. of Delaware, Newark, DE (United States). Delaware Biotechnology Inst.
  3. Univ. of Delaware, Newark, DE (United States)

Synthetic methylotrophy aims to engineer methane and methanol utilization pathways in platform hosts like Escherichia coli for industrial bioprocessing of natural gas and biogas. While recent attempts to engineer synthetic methylotrophs have proved successful, autonomous methylotrophy, i.e. the ability to utilize methane or methanol as sole carbon and energy substrates, has not yet been realized. Here in this paper, we address an important limitation of autonomous methylotrophy in E. coli: the inability of the organism to synthesize several amino acids when grown on methanol. By activating the stringent/stress response via ppGpp overproduction, or DksA and RpoS overexpression, we demonstrate improved biosynthesis of proteinogenic amino acids via endogenous upregulation of amino acid synthesis pathway genes. Thus, we were able to achieve biosynthesis of several limiting amino acids from methanol-derived carbon, in contrast to the control methylotrophic E. coli strain. This study addresses a key limitation currently preventing autonomous methylotrophy in E. coli and possibly other synthetic methylotrophs and provides insight as to how this limitation can be alleviated via stringent/stress response activation.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000432
OSTI ID:
1742083
Alternate ID(s):
OSTI ID: 1617240
Journal Information:
Metabolic Engineering, Journal Name: Metabolic Engineering Vol. 61; ISSN 1096-7176
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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