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Title: Increased Ethylene Production by Overexpressing Phosphoenolpyruvate Carboxylase in the Cyanobacterium Synechocystis PCC 6803

Abstract

Cyanobacteria can be metabolically engineered to convert CO2 to fuels and chemicals such as ethylene. A major challenge in such efforts is to optimize carbon fixation and partition towards target molecules. The efe gene encoding an ethylene-forming enzyme was introduced into a strain of the cyanobacterium Synechocystis PCC 6803 with increased phosphoenolpyruvate carboxylase (PEPc) levels. The resulting engineered strain (CD-P) showed significantly increased ethylene production (10.5 +/- 3.1 ug mL-1 OD-1 day-1) compared to the control strain (6.4 +/- 1.4 ug mL-1 OD-1 day-1). Interestingly, extra copies of the native pepc or the heterologous expression of PEPc from the cyanobacterium Synechococcus PCC 7002 (Synechococcus) in the CD-P, increased ethylene production (19.2 +/- 1.3 and 18.3 +/- 3.3 ug mL-1 OD-1 day-1, respectively) when the cells were treated with the acetyl-CoA carboxylase inhibitor, cycloxydim. A heterologous expression of phosphoenolpyruvate synthase (PPSA) from Synechococcus in the CD-P also increased ethylene production (16.77 +/- 4.48 ug mL-1 OD-1 day-1) showing differences in the regulation of the native and the PPSA from Synechococcus in Synechocystis. This work demonstrates that genetic rewiring of cyanobacterial central carbon metabolism can enhance carbon supply to the TCA cycle and thereby further increase ethylene production.

Authors:
 [1];  [1];  [2];  [1]
  1. Uppsala University
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1598123
Report Number(s):
NREL/JA-2700-74702
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Biotechnology for Biofuels
Additional Journal Information:
Journal Volume: 13
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; ethylene; phosphoenolpyruvate carboxylase; cyanobacterium; Synechocystis; ALPL

Citation Formats

Durall, Claudia, Lindberg, Pia, Yu, Jianping, and Lindbald, Peter. Increased Ethylene Production by Overexpressing Phosphoenolpyruvate Carboxylase in the Cyanobacterium Synechocystis PCC 6803. United States: N. p., 2020. Web. doi:10.1186/s13068-020-1653-y.
Durall, Claudia, Lindberg, Pia, Yu, Jianping, & Lindbald, Peter. Increased Ethylene Production by Overexpressing Phosphoenolpyruvate Carboxylase in the Cyanobacterium Synechocystis PCC 6803. United States. doi:10.1186/s13068-020-1653-y.
Durall, Claudia, Lindberg, Pia, Yu, Jianping, and Lindbald, Peter. Tue . "Increased Ethylene Production by Overexpressing Phosphoenolpyruvate Carboxylase in the Cyanobacterium Synechocystis PCC 6803". United States. doi:10.1186/s13068-020-1653-y.
@article{osti_1598123,
title = {Increased Ethylene Production by Overexpressing Phosphoenolpyruvate Carboxylase in the Cyanobacterium Synechocystis PCC 6803},
author = {Durall, Claudia and Lindberg, Pia and Yu, Jianping and Lindbald, Peter},
abstractNote = {Cyanobacteria can be metabolically engineered to convert CO2 to fuels and chemicals such as ethylene. A major challenge in such efforts is to optimize carbon fixation and partition towards target molecules. The efe gene encoding an ethylene-forming enzyme was introduced into a strain of the cyanobacterium Synechocystis PCC 6803 with increased phosphoenolpyruvate carboxylase (PEPc) levels. The resulting engineered strain (CD-P) showed significantly increased ethylene production (10.5 +/- 3.1 ug mL-1 OD-1 day-1) compared to the control strain (6.4 +/- 1.4 ug mL-1 OD-1 day-1). Interestingly, extra copies of the native pepc or the heterologous expression of PEPc from the cyanobacterium Synechococcus PCC 7002 (Synechococcus) in the CD-P, increased ethylene production (19.2 +/- 1.3 and 18.3 +/- 3.3 ug mL-1 OD-1 day-1, respectively) when the cells were treated with the acetyl-CoA carboxylase inhibitor, cycloxydim. A heterologous expression of phosphoenolpyruvate synthase (PPSA) from Synechococcus in the CD-P also increased ethylene production (16.77 +/- 4.48 ug mL-1 OD-1 day-1) showing differences in the regulation of the native and the PPSA from Synechococcus in Synechocystis. This work demonstrates that genetic rewiring of cyanobacterial central carbon metabolism can enhance carbon supply to the TCA cycle and thereby further increase ethylene production.},
doi = {10.1186/s13068-020-1653-y},
journal = {Biotechnology for Biofuels},
number = ,
volume = 13,
place = {United States},
year = {2020},
month = {1}
}

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