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Title: Expression of Phosphofructokinase Is Not Sufficient to Enable Embden-Meyerhof-Parnas Glycolysis in Zymomonas mobilis ZM4

Abstract

Zymomonas mobilis is a bacterium that produces ethanol from glucose at up to 97% of theoretical efficiency on a carbon basis. One factor contributing to the high efficiency of ethanol production is that Z. mobilis has a low biomass yield. The low biomass yield may be caused partly by the low ATP yield of the Entner-Doudoroff (ED) glycolytic pathway used by Z. mobilis, which produces only one ATP per glucose consumed. To test the hypothesis that ATP yield limits biomass yield in Z. mobilis, we attempted to introduce the Embden-Meyerhof-Parnas (EMP) glycolytic pathway (with double the ATP yield) by expressing phosphofructokinase (Pfk I) from Escherichia coli. Expression of Pfk I caused growth inhibition and resulted in accumulation of mutations in the pfkA gene. Co-expression of additional EMP enzymes, fructose bisphosphate aldolase (Fba) and triose phosphate isomerase (Tpi), with Pfk I did not enable EMP flux, and resulted in production of glycerol as a side product. Further analysis indicated that heterologous reactions may have operated in the reverse direction because of native metabolite concentrations. This study reveals how the metabolomic context of a chassis organism influences the range of pathways that can be added by heterologous expression.

Authors:
 [1];  [2];  [2];  [2];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1579344
Grant/Contract Number:  
SC0018409; FC02-07ER64494; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Frontiers in Microbiology
Additional Journal Information:
Journal Volume: 10; Journal ID: ISSN 1664-302X
Publisher:
Frontiers Research Foundation
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Zymomonas mobilis; glycolysis; Embden-Meyerhof-Parnas pathway; Entner-Doudoroff pathway; metabolic engineering

Citation Formats

Felczak, Magdalena M., Jacobson, Tyler B., Ong, Wai Kit, Amador-Noguez, Daniel, and TerAvest, Michaela A. Expression of Phosphofructokinase Is Not Sufficient to Enable Embden-Meyerhof-Parnas Glycolysis in Zymomonas mobilis ZM4. United States: N. p., 2019. Web. doi:10.3389/fmicb.2019.02270.
Felczak, Magdalena M., Jacobson, Tyler B., Ong, Wai Kit, Amador-Noguez, Daniel, & TerAvest, Michaela A. Expression of Phosphofructokinase Is Not Sufficient to Enable Embden-Meyerhof-Parnas Glycolysis in Zymomonas mobilis ZM4. United States. https://doi.org/10.3389/fmicb.2019.02270
Felczak, Magdalena M., Jacobson, Tyler B., Ong, Wai Kit, Amador-Noguez, Daniel, and TerAvest, Michaela A. Fri . "Expression of Phosphofructokinase Is Not Sufficient to Enable Embden-Meyerhof-Parnas Glycolysis in Zymomonas mobilis ZM4". United States. https://doi.org/10.3389/fmicb.2019.02270. https://www.osti.gov/servlets/purl/1579344.
@article{osti_1579344,
title = {Expression of Phosphofructokinase Is Not Sufficient to Enable Embden-Meyerhof-Parnas Glycolysis in Zymomonas mobilis ZM4},
author = {Felczak, Magdalena M. and Jacobson, Tyler B. and Ong, Wai Kit and Amador-Noguez, Daniel and TerAvest, Michaela A.},
abstractNote = {Zymomonas mobilis is a bacterium that produces ethanol from glucose at up to 97% of theoretical efficiency on a carbon basis. One factor contributing to the high efficiency of ethanol production is that Z. mobilis has a low biomass yield. The low biomass yield may be caused partly by the low ATP yield of the Entner-Doudoroff (ED) glycolytic pathway used by Z. mobilis, which produces only one ATP per glucose consumed. To test the hypothesis that ATP yield limits biomass yield in Z. mobilis, we attempted to introduce the Embden-Meyerhof-Parnas (EMP) glycolytic pathway (with double the ATP yield) by expressing phosphofructokinase (Pfk I) from Escherichia coli. Expression of Pfk I caused growth inhibition and resulted in accumulation of mutations in the pfkA gene. Co-expression of additional EMP enzymes, fructose bisphosphate aldolase (Fba) and triose phosphate isomerase (Tpi), with Pfk I did not enable EMP flux, and resulted in production of glycerol as a side product. Further analysis indicated that heterologous reactions may have operated in the reverse direction because of native metabolite concentrations. This study reveals how the metabolomic context of a chassis organism influences the range of pathways that can be added by heterologous expression.},
doi = {10.3389/fmicb.2019.02270},
journal = {Frontiers in Microbiology},
number = ,
volume = 10,
place = {United States},
year = {Fri Sep 27 00:00:00 EDT 2019},
month = {Fri Sep 27 00:00:00 EDT 2019}
}

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