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Title: Cyanobacterial carbon metabolism: Fluxome plasticity and oxygen dependence: Cyanobacterial Carbon Metabolism

Abstract

ABSTRACT Synechocystis sp. strain PCC 6803 has been widely used as a photo‐biorefinery chassis. Based on its genome annotation, this species contains a complete TCA cycle, an Embden‐Meyerhof‐Parnas pathway (EMPP), an oxidative pentose phosphate pathway (OPPP), and an Entner–Doudoroff pathway (EDP). To evaluate how Synechocystis 6803 catabolizes glucose under heterotrophic conditions, we performed 13 C metabolic flux analysis, metabolite pool size analysis, gene knockouts, and heterologous expressions. The results revealed a cyclic mode of flux through the OPPP. Small, but non‐zero, fluxes were observed through the TCA cycle and the malic shunt. Independent knockouts of 6‐phosphogluconate dehydrogenase ( gnd ) and malic enzyme ( me ) corroborated these results, as neither mutant could grow under dark heterotrophic conditions. Our data also indicate that Synechocystis 6803 metabolism relies upon oxidative phosphorylation to generate ATP from NADPH under dark or insufficient light conditions. The pool sizes of intermediates in the TCA cycle, particularly acetyl‐CoA, were found to be several fold lower in Synechocystis 6803 (compared to E. coli metabolite pool sizes), while its sugar phosphate intermediates were several‐fold higher. Moreover, negligible flux was detected through the native, or heterologous, EDP in the wild type or Δ gnd strains under heterotrophic conditions. Comparingmore » photoautotrophic, photomixotrophic, and heterotrophic conditions, the Calvin cycle, OPPP, and EMPP in Synechocystis 6803 possess the ability to regulate their fluxes under various growth conditions (plastic), whereas its TCA cycle always maintains at low levels (rigid). This work also demonstrates how genetic profiles do not always reflect actual metabolic flux through native or heterologous pathways. Biotechnol. Bioeng. 2017;114: 1593–1602. © 2017 Wiley Periodicals, Inc.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [3];  [4]; ORCiD logo [1]
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  1. Washington Univ., St. Louis, MO (United States)
  2. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Technical Univ. of Denmark, Lyngby (Denmark)
  4. Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis Missouri 63130
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1393244
Alternate Identifier(s):
OSTI ID: 1401285
Grant/Contract Number:  
AC02-05CH11231; SCGF2015; DESC0012722
Resource Type:
Accepted Manuscript
Journal Name:
Biotechnology and Bioengineering
Additional Journal Information:
Journal Volume: 114; Journal Issue: 7; Journal ID: ISSN 0006-3592
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Wan, Ni, DeLorenzo, Drew M., He, Lian, You, Le, Immethun, Cheryl M., Wang, George, Baidoo, Edward E. K., Hollinshead, Whitney, Keasling, Jay D., Moon, Tae Seok, and Tang, Yinjie J. Cyanobacterial carbon metabolism: Fluxome plasticity and oxygen dependence: Cyanobacterial Carbon Metabolism. United States: N. p., 2017. Web. doi:10.1002/bit.26287.
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Wan, Ni, DeLorenzo, Drew M., He, Lian, You, Le, Immethun, Cheryl M., Wang, George, Baidoo, Edward E. K., Hollinshead, Whitney, Keasling, Jay D., Moon, Tae Seok, & Tang, Yinjie J. Cyanobacterial carbon metabolism: Fluxome plasticity and oxygen dependence: Cyanobacterial Carbon Metabolism. United States. https://doi.org/10.1002/bit.26287
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Wan, Ni, DeLorenzo, Drew M., He, Lian, You, Le, Immethun, Cheryl M., Wang, George, Baidoo, Edward E. K., Hollinshead, Whitney, Keasling, Jay D., Moon, Tae Seok, and Tang, Yinjie J. Thu . "Cyanobacterial carbon metabolism: Fluxome plasticity and oxygen dependence: Cyanobacterial Carbon Metabolism". United States. https://doi.org/10.1002/bit.26287. https://www.osti.gov/servlets/purl/1393244.
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@article{osti_1393244,
title = {Cyanobacterial carbon metabolism: Fluxome plasticity and oxygen dependence: Cyanobacterial Carbon Metabolism},
author = {Wan, Ni and DeLorenzo, Drew M. and He, Lian and You, Le and Immethun, Cheryl M. and Wang, George and Baidoo, Edward E. K. and Hollinshead, Whitney and Keasling, Jay D. and Moon, Tae Seok and Tang, Yinjie J.},
abstractNote = {ABSTRACT Synechocystis sp. strain PCC 6803 has been widely used as a photo‐biorefinery chassis. Based on its genome annotation, this species contains a complete TCA cycle, an Embden‐Meyerhof‐Parnas pathway (EMPP), an oxidative pentose phosphate pathway (OPPP), and an Entner–Doudoroff pathway (EDP). To evaluate how Synechocystis 6803 catabolizes glucose under heterotrophic conditions, we performed 13 C metabolic flux analysis, metabolite pool size analysis, gene knockouts, and heterologous expressions. The results revealed a cyclic mode of flux through the OPPP. Small, but non‐zero, fluxes were observed through the TCA cycle and the malic shunt. Independent knockouts of 6‐phosphogluconate dehydrogenase ( gnd ) and malic enzyme ( me ) corroborated these results, as neither mutant could grow under dark heterotrophic conditions. Our data also indicate that Synechocystis 6803 metabolism relies upon oxidative phosphorylation to generate ATP from NADPH under dark or insufficient light conditions. The pool sizes of intermediates in the TCA cycle, particularly acetyl‐CoA, were found to be several fold lower in Synechocystis 6803 (compared to E. coli metabolite pool sizes), while its sugar phosphate intermediates were several‐fold higher. Moreover, negligible flux was detected through the native, or heterologous, EDP in the wild type or Δ gnd strains under heterotrophic conditions. Comparing photoautotrophic, photomixotrophic, and heterotrophic conditions, the Calvin cycle, OPPP, and EMPP in Synechocystis 6803 possess the ability to regulate their fluxes under various growth conditions (plastic), whereas its TCA cycle always maintains at low levels (rigid). This work also demonstrates how genetic profiles do not always reflect actual metabolic flux through native or heterologous pathways. Biotechnol. Bioeng. 2017;114: 1593–1602. © 2017 Wiley Periodicals, Inc.},
doi = {10.1002/bit.26287},
journal = {Biotechnology and Bioengineering},
number = 7,
volume = 114,
place = {United States},
year = {Thu Mar 30 00:00:00 EDT 2017},
month = {Thu Mar 30 00:00:00 EDT 2017}
}
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