학술논문
Corynebacterium glutamicum, a natural overproducer of succinic acid?
Document Type
Report
Author
Source
Engineering in Life Sciences. January 20, 2020, Vol. 20 Issue 5-6, p205, 11 p.
Subject
Language
English
ISSN
1618-0240
Abstract
Abbreviations INTRODUCTION Corynebacterium glutamicum has become a platform organism for white biotechnology widely used in industry for the production of amino acids such as lysine and glutamate. Several studies have [...]
: Corynebacterium glutamicum is well known as an important industrial amino acid producer. For a few years, its ability to produce organic acids, under micro‐aerobic or anaerobic conditions was demonstrated. This study is focused on the identification of the culture parameters influencing the organic acids production and, in particular, the succinate production, by this bacterium. Corynebacterium glutamicum 2262, used throughout this study, was a wild‐type strain, which was not genetically designed for the production of succinate. The oxygenation level and the residual glucose concentration appeared as two critical parameters for the organic acids production. The maximal succinate concentration (4.9 g L[sup.−1]) corresponded to the lower kLa value of 5 h[sup.−1]. Above 5 h[sup.−1], a transient accumulation of the succinate was observed. Interestingly, the stop in the succinate production was concomitant with a lower threshold glucose concentration of 9 g L[sup.−1]. Taking into account this threshold, a fed‐batch culture was performed to optimize the succinate production with C. glutamicum 2262. The results showed that this wild‐type strain was able to produce 93.6 g L[sup.−1] of succinate, which is one of the highest concentration reported in the literature.
: Corynebacterium glutamicum is well known as an important industrial amino acid producer. For a few years, its ability to produce organic acids, under micro‐aerobic or anaerobic conditions was demonstrated. This study is focused on the identification of the culture parameters influencing the organic acids production and, in particular, the succinate production, by this bacterium. Corynebacterium glutamicum 2262, used throughout this study, was a wild‐type strain, which was not genetically designed for the production of succinate. The oxygenation level and the residual glucose concentration appeared as two critical parameters for the organic acids production. The maximal succinate concentration (4.9 g L[sup.−1]) corresponded to the lower kLa value of 5 h[sup.−1]. Above 5 h[sup.−1], a transient accumulation of the succinate was observed. Interestingly, the stop in the succinate production was concomitant with a lower threshold glucose concentration of 9 g L[sup.−1]. Taking into account this threshold, a fed‐batch culture was performed to optimize the succinate production with C. glutamicum 2262. The results showed that this wild‐type strain was able to produce 93.6 g L[sup.−1] of succinate, which is one of the highest concentration reported in the literature.