Systematic identification and elimination of flux bottlenecks in the aldehyde production pathway of Synechococcus elongatus PCC 7942.


Journal

Metabolic engineering
ISSN: 1096-7184
Titre abrégé: Metab Eng
Pays: Belgium
ID NLM: 9815657

Informations de publication

Date de publication:
07 2020
Historique:
received: 03 12 2019
revised: 27 02 2020
accepted: 17 03 2020
pubmed: 31 3 2020
medline: 29 5 2021
entrez: 31 3 2020
Statut: ppublish

Résumé

Isotopically nonstationary metabolic flux analysis (INST-MFA) provides a versatile platform to quantitatively assess in vivo metabolic activities of autotrophic systems. By applying INST-MFA to recombinant aldehyde-producing cyanobacteria, we identified metabolic alterations that correlated with increased strain performance in order to guide rational metabolic engineering. We identified four reactions adjacent to the pyruvate node that varied significantly with increasing aldehyde production: pyruvate kinase (PK) and acetolactate synthase (ALS) fluxes were directly correlated with product formation, while pyruvate dehydrogenase (PDH) and phosphoenolpyruvate carboxylase (PPC) fluxes were inversely correlated. Overexpression of enzymes for PK or ALS did not result in further improvements to the previous best-performing strain, while downregulation of PDH expression (through antisense RNA expression) or PPC flux (through expression of the reverse reaction, phosphoenolpyruvate carboxykinase) provided significant improvements. These results illustrate the potential of INST-MFA to enable a systematic approach for iterative identification and removal of pathway bottlenecks in autotrophic host cells.

Identifiants

pubmed: 32222320
pii: S1096-7176(20)30062-8
doi: 10.1016/j.ymben.2020.03.007
pmc: PMC7217728
mid: NIHMS1583844
pii:
doi:

Substances chimiques

Aldehydes 0
Amino Acids 0
Pyruvate Dehydrogenase Complex 0
Pyruvates 0
RNA, Bacterial 0
Acetolactate Synthase EC 2.2.1.6
Pyruvate Kinase EC 2.7.1.40
Phosphoenolpyruvate Carboxylase EC 4.1.1.31

Types de publication

Journal Article Research Support, N.I.H., Extramural Research Support, U.S. Gov't, Non-P.H.S.

Langues

eng

Sous-ensembles de citation

IM

Pagination

56-65

Subventions

Organisme : NIGMS NIH HHS
ID : R01 GM067152
Pays : United States
Organisme : NIGMS NIH HHS
ID : R01 GM107434
Pays : United States
Organisme : NIGMS NIH HHS
ID : R37 GM067152
Pays : United States
Organisme : NIDDK NIH HHS
ID : T32 DK101003
Pays : United States

Informations de copyright

Copyright © 2020 International Metabolic Engineering Society. Published by Elsevier Inc. All rights reserved.

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Auteurs

Yi Ern Cheah (YE)

Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA.

Yao Xu (Y)

Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA.

Sarah A Sacco (SA)

Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA.

Piyoosh K Babele (PK)

Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA.

Amy O Zheng (AO)

Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA.

Carl Hirschie Johnson (CH)

Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA; Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA.

Jamey D Young (JD)

Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA; Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA. Electronic address: j.d.young@vanderbilt.edu.

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Classifications MeSH