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Title: Laboratory evolution reveals the metabolic and regulatory basis of ethylene glycol metabolism by Pseudomonas putida KT2440

Journal Article · · Environmental Microbiology
ORCiD logo [1];  [2];  [2];  [3];  [1];  [3];  [1];  [2];  [3];  [4]
  1. RWTH Aachen Univ., Aachen (Germany)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of Stuttgart, Stuttgart (Germany)
  4. RWTH Aachen Univ., Aachen (Germany); Forschungszentrum Jülich, Jülich (Germany)

Pollution from ethylene glycol, and plastics containing this monomer, represent a significant environmental problem. The investigation of its microbial metabolism therefore provides insights into the environmental fate of this pollutant, but also enables its utilization as a carbon source for microbial biotechnology. Here, we reveal the genomic and metabolic basis of ethylene glycol metabolism in Pseudomonas putida KT2440. Although this strain cannot grow on ethylene glycol as sole carbon source, it can be used to generate growth-enhancing reducing equivalents upon co-feeding with acetate. Mutants that utilize ethylene glycol as sole carbon source were isolated through adaptive laboratory evolution. Genomic analysis of these mutants revealed a central role of the transcriptional regulator GclR, which represses the glyoxylate carboligase pathway as part of a larger metabolic context of purine and allantoin metabolism. Secondary mutations in a transcriptional regulator encoded by PP_2046 and a porin encoded by PP_2662 further improved growth on ethylene glycol in evolved strains, likely by balancing fluxes through the initial oxidations of ethylene glycol to glyoxylate. With this knowledge we reverse engineered an ethylene glycol utilizing strain and thus, revealed the metabolic and regulatory basis that are essential for efficient ethylene glycol metabolism in P. putida KT2440.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation and Fuels. Bioenergy Technologies Office (BETO); USDOE
Grant/Contract Number:
AC36-08GO28308; AC36‐08GO28308
OSTI ID:
1526901
Alternate ID(s):
OSTI ID: 1542549
Report Number(s):
NREL/JA-2A00-74156
Journal Information:
Environmental Microbiology, Vol. 21; ISSN 1462-2912
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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