Journal Article

FZJ-2019-05319

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Comprehensive analysis of metabolic sensitivity of 1,4‐butanediol producing Escherichia coli toward substrate and oxygen availability

Pooth, V.FZJ* ; Gaalen, K. ; Trenkamp, S. ; Wiechert, W.FZJ* ; Oldiges, M. (Corresponding author)FZJ*

2020
Wiley Malden, MA

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Please use a persistent id in citations: http://hdl.handle.net/2128/24331  doi:10.1002/btpr.2917

Abstract: Nowadays, chemical production of 1,4‐butanediol is supplemented by biotechnological processes using a genetically modified Escherichia coli strain, which is an industrial showcase of successful application of metabolic engineering. However, large scale bioprocess performance can be affected by presence of physical and chemical gradients in bioreactors which are a consequence of imperfect mixing and limited oxygen transfer. Hence, upscaling comes along with local and time dependent fluctuations of cultivation conditions. This study emphasizes on scale‐up related effects of microbial 1,4‐butanediol production by comprehensive bioprocess characterization in lab scale. Due to metabolic network constraints 1,4‐butanediol formation takes place under oxygen limited microaerobic conditions, which can be hardly realized in large scale bioreactor. The purpose of this study was to assess the extent to which substrate and oxygen availability influence the productivity. It was found, that the substrate specific product yield and the production rate are higher under substrate excess than under substrate limitation. Furthermore, the level of oxygen supply within microaerobic conditions revealed strong effects on product and by‐product formation. Under strong oxygen deprivation nearly 30% of the consumed carbon is converted into 1,4‐butanediol, whereas an increase in oxygen supply results in 1,4‐butanediol reduction of 77%. Strikingly, increasing oxygen availability leads to strong increase of main by‐product acetate as well as doubled carbon dioxide formation. The study provides clear evidence that scale‐up of microaerobic bioprocesses constitute a substantial challenge. Although oxygen is strictly required for product formation, the data give clear evidence that terms of anaerobic and especially aerobic conditions strongly interfere with 1,4‐butanediol production.

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Contributing Institute(s):

1. Biotechnologie (IBG-1)

Research Program(s):

1. 581 - Biotechnology (POF3-581) (POF3-581)

Appears in the scientific report 2020

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Database coverage:
; ; ; BIOSIS Previews ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Life Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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