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Title: Isotopically nonstationary 13C flux analysis of cyanobacterial isobutyraldehyde production

Journal Article · · Metabolic Engineering

Here, we applied isotopically nonstationary 13C metabolic flux analysis (INST-MFA) to compare the pathway fluxes of wild-type (WT) Synechococcus elongatus PCC 7942 to an engineered strain (SA590) that produces isobutyraldehyde (IBA). The flux maps revealed a potential bottleneck at the pyruvate kinase (PK) reaction step that was associated with diversion of flux into a three-step PK bypass pathway involving the enzymes PEP carboxylase (PEPC), malate dehydrogenase (MDH), and malic enzyme (ME). Overexpression of pk in SA590 led to a significant improvement in IBA specific productivity. Single-gene overexpression of the three enzymes in the proposed PK bypass pathway also led to improvements in IBA production, although to a lesser extent than pk overexpression. Combinatorial overexpression of two of the three genes in the proposed PK bypass pathway (mdh and me) led to improvements in specific productivity that were similar to those achieved by single-gene pk overexpression. Our work demonstrates how 13C flux analysis can be used to identify potential metabolic bottlenecks and novel metabolic routes, and how these findings can guide rational metabolic engineering of cyanobacteria for increased production of desired molecules.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0008118; AC05-06OR23100; P200A090323
OSTI ID:
1462034
Alternate ID(s):
OSTI ID: 1397026
Journal Information:
Metabolic Engineering, Vol. 42, Issue C; ISSN 1096-7176
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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An improved method for extraction of polar and charged metabolites from cyanobacteria journal October 2018
Deciphering cyanobacterial phenotypes for fast photoautotrophic growth via isotopically nonstationary metabolic flux analysis journal November 2017
Engineering and systems-level analysis of Pseudomonas chlororaphis for production of phenazine-1-carboxamide using glycerol as the cost-effective carbon source journal May 2018
The challenge and potential of photosynthesis: unique considerations for metabolic flux measurements in photosynthetic microorganisms journal November 2018
Model metabolic strategy for heterotrophic bacteria in the cold ocean based on Colwellia psychrerythraea 34H journal November 2018
Elevated carbon dioxide levels lead to proteome-wide alterations for optimal growth of a fast-growing cyanobacterium, Synechococcus elongatus PCC 11801 journal April 2019
13C metabolic flux analysis-guided metabolic engineering of Escherichia coli for improved acetol production from glycerol journal February 2019
Applications of stable isotope-based metabolomics and fluxomics toward synthetic biology of cyanobacteria journal December 2019
A Novel Cyanobacterium Synechococcus elongatus PCC 11802 has Distinct Genomic and Metabolomic Characteristics Compared to its Neighbor PCC 11801 journal January 2020
Metabolic engineering strategies for enhanced shikimate biosynthesis: current scenario and future developments journal July 2018