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Biotechnol Prog. 2019 Mar 9:e2804. doi: 10.1002/btpr.2804. [Epub ahead of print]

Carboxylic Acid Consumption and Production by Corynebacterium glutamicum.

Author information

1
Bioprocess Engineering, Dept. of Biotechnology, Technische Universität Berlin, Ackerstrasse 76 ACK 24, D-13355 Berlin, Germany.
2
Research Centre Juelich, Institute of Bio- and Geosciences, IBG-1: Biotechnology, D-52425 Juelich, Germany.

Abstract

Corynebacterium glutamicum is well-known as an industrial workhorse, most notably for its use in the bulk production of amino acids in the feed and food sector. Previous studies of the effect of gradients in scale-down reactors with complex media disclosed an accumulation of several carboxylic acids and a parallel decrease of growth and product accumulation. This study, therefore, addresses the impact of carboxylic acids, e.g. acetate and l-lactate, on the cultivation of the cadaverine producing strain C. glutamicum DM1945∆ act3:Ptuf-ldcCOPT and their potential role in scale up related performance losses. A fluctuating power input in shake flask and stirred tank cultivations with mineral salt was applied to mimic discontinuous oxygen availability. Results demonstrate, whenever sufficient oxygen was available, C. glutamicum recovered from previously occurring stressful conditions like an oxygen limiting phase. Re-assimilation of acids was detected simultaneously. In cultures, which were supplemented with either acetate or l-lactate, a rapid co-metabolization of both acids in presence of glucose was observed, showing conversion rates of 7.8 and 3.8 mmol gcell dry weight -1 h-1 , respectively. Uptake of these acids was accompanied by increased oxygen consumption. Proteins related to oxidative stress response, glycogen synthesis and the main carbon metabolism were found in altered concentrations under oscillatory cultivation conditions. (Proteomics data are available via ProteomeXchange with identifier PXD012760.) Virtually no impact on growth or product formation was observed. We conclude that the reduced growth and product formation in scale-down cultivations when complex media was used is not caused by the accumulation of carboxylic acids. This article is protected by copyright. All rights reserved.

KEYWORDS:

Corynebacterium glutamicum; carboxylic acid; heterogeneity; oxygen oscillation; scale down

PMID:
30851150
DOI:
10.1002/btpr.2804

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