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Li Y, Guo Y, Niu F, Gao H, Wang Q, Xu M. Regulation of oxidative stress response and antioxidant modification in Corynebacterium glutamicum. World J Microbiol Biotechnol 2024; 40:267. [PMID: 39004689 DOI: 10.1007/s11274-024-04066-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Accepted: 06/27/2024] [Indexed: 07/16/2024]
Abstract
As an efficient and safe industrial bacterium, Corynebacterium glutamicum has extensive application in amino acid production. However, it often faces oxidative stress induced by reactive oxygen species (ROS), leading to diminished production efficiency. To enhance the robustness of C. glutamicum, numerous studies have focused on elucidating its regulatory mechanisms under various stress conditions such as heat, acid, and sulfur stress. However, a comprehensive review of its defense mechanisms against oxidative stress is needed. This review offers an in-depth overview of the mechanisms C. glutamicum employs to manage oxidative stress. It covers both enzymatic and non-enzymatic systems, including antioxidant enzymes, regulatory protein families, sigma factors involved in transcription, and physiological redox reduction pathways. This review provides insights for advancing research on the antioxidant mechanisms of C. glutamicum and sheds light on its potential applications in industrial production.
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Affiliation(s)
- Yueshu Li
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Yuanyi Guo
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Fangyuan Niu
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Hui Gao
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Qing Wang
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Meijuan Xu
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.
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Zhang J, Zhao Y, Peng Z, Yang M, Zou W, Wu X, Wang C, Si M, Chen C. The role of the transcriptional repressor CssR in Corynebacterium glutamicum in response to phenolic compounds. Heliyon 2024; 10:e27929. [PMID: 38509974 PMCID: PMC10950717 DOI: 10.1016/j.heliyon.2024.e27929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 03/05/2024] [Accepted: 03/08/2024] [Indexed: 03/22/2024] Open
Abstract
The cssR gene (ncgl1578) of Corynebacterium glutamicum encodes a repressor of the TetR (tetracycline regulator) family. Its role in the stress response to antibiotics/heavy metals has been investigated, but how CssR functions in response to phenolic compounds in C. glutamicum has been rarely studied. In this study, we applied transcriptomic analysis, β-galactosidase analysis, qRT-PCR, and EMSAs to analyze the target genes and functions of CssR in response to phenolic compounds. Consistent with the upregulation of genes involved in the degradation of phenolic compounds, the ΔcssR mutant was more resistant to various phenolic compounds than was the wild-type strain. Furthermore, the addition of phenolic compounds induced the expression of corresponding genes (ncgl0283, ncgl1032, ncgl1111, ncgl2920, ncgl2923, and ncgl2952) in vivo. However, the DNA binding activity of CssR to the promoter of phenolic compound-degrading genes was undetected in vitro. Additionally, we also found that CssR indirectly negatively regulates the expression of cell wall/membrane/envelope biogenesis-related genes, which may enhance resistance to stress caused by phenolic compounds. Together, our findings demonstrate that CssR is a key regulator that copes with stress conditions induced by phenolic compounds, thus greatly expanding our understanding of the functions of TetR family transcription factors.
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Affiliation(s)
- Ju Zhang
- Key Laboratory of Plant Genetics and Molecular Breeding, Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, 466001, Henan, China
- College of Horticulture, Agricultural University of Hebei/Key Laboratory for Vegetable Germplasm Enhancement and Utilization of Hebei/Collaborative Innovation Center of Vegetable Industry in Hebei, Baoding, 071001, China
| | - Yuying Zhao
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Zhaoxin Peng
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - MingFei Yang
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Wenyu Zou
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Xinyu Wu
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Chenghui Wang
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Meiru Si
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Can Chen
- Key Laboratory of Plant Genetics and Molecular Breeding, Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, 466001, Henan, China
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Su T, Che C, Han J, Zhao Y, Zhang Z, An G, Si M, Chen C. The TetR-type regulator AtsR is involved in multidrug response in Corynebacterium glutamicum. Microb Cell Fact 2022; 21:123. [PMID: 35729563 PMCID: PMC9210681 DOI: 10.1186/s12934-022-01850-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/05/2022] [Indexed: 11/10/2022] Open
Abstract
Background The TetR (tetracycline repressor) family is one of the major transcription factor families that regulate expression of genes involved in bacterial antimicrobial resistance systems. NCgl0886 protein, designated as AtsR, is a member of the TetR family identified in Corynebacterium glutamicum, which is conserved in several species of the genera Corynebacterium, also including the well-known pathogen C. diphtheriae. AtsR is located at no far upstream of the identically oriented ncgl0884 gene, encoding a putative multidrug efflux pump protein, and in the same operon with ncgl0887, encoding a resistance, nodulation and cell division (RND) superfamily drug exporter. However, the role of AtsR is not clearly understood. Results Here we showed that dimeric AtsR directly repressed the expression of the ncgl0887-atsR operon, as well as indirectly controlled the ncgl0884 transcription. Antibiotics and toxic compounds induced the expression of ncgl0887-atsR operon. A perfect palindromic motif (5΄-TGCAA-N2-TTGCA-3΄; 12 bp) was identified in the upstream region of ncgl0887-atsR operon. Electrophoretic mobility shift assays (EMSAs) demonstrated specific binding of AtsR to this motif, and hydrogen peroxide (H2O2) blocked binding. H2O2 oxidized cysteine residues to form Cys123-Cys187 intermolecular disulfide bonds between two subunits in AtsR dimer, which altered its DNA-binding characteristics and caused its dissociation, thereby leading to derepression of the drug efflux protein. Deletion of ncgl0884 and ncgl0887 increased the susceptibilities of C. glutamicum for several toxic compounds, but overexpression of atsR decreased the drug tolerance of C. glutamicum. Conclusions Our study revealed that AtsR was a redox regulator that sensed oxidative stress via thiol modification. The results obtained here will contribute to our understanding of the drug response mechanism not only in C. glutamicum but also in the related bacteria C. diphtheriae. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-022-01850-0.
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Affiliation(s)
- Tao Su
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China.
| | - Chengchuan Che
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Jiyu Han
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Yuying Zhao
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Zihan Zhang
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Guangdi An
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Meiru Si
- College of Life Sciences, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Can Chen
- Key Laboratory of Plant Genetics and Molecular Breeding, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, 466001, China.
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Jeong H, Kim Y, Lee HS. OsnR is an autoregulatory negative transcription factor controlling redox-dependent stress responses in Corynebacterium glutamicum. Microb Cell Fact 2021; 20:203. [PMID: 34663317 PMCID: PMC8524982 DOI: 10.1186/s12934-021-01693-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 10/07/2021] [Indexed: 01/11/2023] Open
Abstract
Background Corynebacterium glutamicum is used in the industrial production of amino acids and nucleotides. During the course of fermentation, C. glutamicum cells face various stresses and employ multiple regulatory genes to cope with the oxidative stress. The osnR gene plays a negative regulatory role in redox-dependent oxidative-stress responses, but the underlying mechanism is not known yet. Results Overexpression of the osnR gene in C. glutamicum affected the expression of genes involved in the mycothiol metabolism. ChIP-seq analysis revealed that OsnR binds to the promoter region of multiple genes, including osnR and cg0026, which seems to function in the membrane-associated redox metabolism. Studies on the role of the osnR gene involving in vitro assays employing purified OsnR proteins and in vivo physiological analyses have identified that OsnR inhibits the transcription of its own gene. Further, oxidant diamide stimulates OsnR-binding to the promoter region of the osnR gene. The genes affected by the overexpression of osnR have been found to be under the control of σH. In the osnR-overexpressing strain, the transcription of sigH is significantly decreased and the stimulation of sigH transcription by external stress is lost, suggesting that osnR and sigH form an intimate regulatory network. Conclusions Our study suggests that OsnR not only functions as a transcriptional repressor of its own gene and of those involved in redox-dependent stress responses but also participates in the global transcriptional regulation by controlling the transcription of other master regulators, such as sigH. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-021-01693-1.
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Affiliation(s)
- Haeri Jeong
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Republic of Korea
| | - Younhee Kim
- Department of Korean Medicine, Semyung University, Jecheon, Chungbuk, Republic of Korea
| | - Heung-Shick Lee
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Republic of Korea.
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Liu Y, Yang W, Su T, Che C, Li G, Chen C, Si M. The cssR gene of Corynebacterium glutamicum plays a negative regulatory role in stress responses. Microb Cell Fact 2021; 20:110. [PMID: 34082775 PMCID: PMC8176726 DOI: 10.1186/s12934-021-01600-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 05/25/2021] [Indexed: 12/19/2022] Open
Abstract
Background CssR, the product of the Corynebacterium glutamicum ncgl1578 gene cotranscribed with ncgl1579, is a TetR (tetracycline regulator) family repressor. Although many TetR-type regulators in C. glutamicum have been extensively described, members of the TetR family involved in the stress response remain unidentified. Results In this study, we found that CssR regulated the transcription of its own gene and the ncgl1576-ncgl1577 operon. The ncgl1576-ncgl1577 operon, which is located upstream of cssR in the orientation opposite that of the cssR operon, encodes an ATP-binding cassette (ABC), some of which are involved in the export of a wide range of antimicrobial compounds. The cssR-deletion (ΔcssR) mutant displayed increased resistance to various stresses. An imperfect palindromic motif (5′-TAA(G)TGN13CA(G)TTA-3′; 25 bp) located at the intergenic region between cssR and ncgl1577 was identified as the sole binding site for CssR. Expression of cssR and ncgl1577 was induced by antibiotics and heavy metals but not H2O2 or diamide, and the DNA-binding activity of CssR was impaired by antibiotics and heavy metals but not H2O2. Antibiotics and heavy metals caused CssR dissociation from target gene promoters, thus derepressing their transcription. Oxidant treatment neither altered the conformation of CssR nor modified its cysteine residues, indicating that the cysteine residues in CssR have no redox activity. In the ΔcssR mutant strain, genes involved in redox homeostasis also showed increased transcription levels, and the NADPH/NADP+ ratio was higher than that of the parental strain. Conclusion The stress response mechanism of CssR in C. glutamicum is realized via ligand-induced conformational changes of the protein, not via cysteine oxidation-based thiol modification. Moreover, the crucial role of CssR in the stress response was demonstrated by negatively controlling the expression of the ncgl1576-ncgl1577 operon, its structural gene, and/or redox homeostasis-related genes. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-021-01600-8.
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Affiliation(s)
- Yang Liu
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Wenzhi Yang
- School of Food Science and Nutrition, University of Leeds, Leeds, LS2 9JT, UK
| | - Tao Su
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Chengchuan Che
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Guizhi Li
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Can Chen
- Key Laboratory of Plant Genetics and Molecular Breeding, Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, 466001, Henan, China.
| | - Meiru Si
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China.
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Lee MJ, Park J, Park K, Kim JF, Kim P. Reverse Engineering Targets for Recombinant Protein Production in Corynebacterium glutamicum Inspired by a Fast-Growing Evolved Descendant. Front Bioeng Biotechnol 2020; 8:588070. [PMID: 33363126 PMCID: PMC7755716 DOI: 10.3389/fbioe.2020.588070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 11/09/2020] [Indexed: 11/13/2022] Open
Abstract
We previously reported a Corynebacterium glutamicum JH41 strain with a 58% faster growth rate through application of adaptive laboratory evolution. To verify that the fast-reproducing strain was useful as a host for recombinant protein expression, we introduced a plasmid responsible for the secretory production of a recombinant protein. The JH41 strain harboring the plasmid indeed produced the secretory recombinant protein at a 2.7-fold greater rate than its ancestral strain. To provide the reverse engineering targets responsible for boosting recombinant protein production and cell reproduction, we compared the genome sequence of the JH41 strain with its ancestral strain. Among the 15 genomic variations, a point mutation was confirmed in the 14 bases upstream of NCgl1959 (encoding a presumed siderophore-binding protein). This mutation allowed derepression of NCgl1959, thereby increasing iron consumption and ATP generation. A point mutation in the structural gene ramA (A239G), a LuxR-type global transcription regulator involved in central metabolism, allowed an increase in glucose consumption. Therefore, mutations to increase the iron and carbon consumption were concluded as being responsible for the enhanced production of recombinant protein and cell reproduction in the evolved host.
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Affiliation(s)
- Min Ju Lee
- Department of Biotechnology, The Catholic University of Korea, Gyeonggi, South Korea
| | - Jihoon Park
- Department of Biotechnology, The Catholic University of Korea, Gyeonggi, South Korea
| | - Kyunghoon Park
- Department of Biotechnology, The Catholic University of Korea, Gyeonggi, South Korea
| | - Jihyun F Kim
- Department of Systems Biology, Division of Life Sciences, and Institute for Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Pil Kim
- Department of Biotechnology, The Catholic University of Korea, Gyeonggi, South Korea
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Si M, Chen C, Zhong J, Li X, Liu Y, Su T, Yang G. MsrR is a thiol-based oxidation-sensing regulator of the XRE family that modulates C. glutamicum oxidative stress resistance. Microb Cell Fact 2020; 19:189. [PMID: 33008408 PMCID: PMC7532634 DOI: 10.1186/s12934-020-01444-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 09/25/2020] [Indexed: 11/10/2022] Open
Abstract
Background Corynebacterium glutamicum thrives under oxidative stress caused by the inevitably extreme environment during fermentation as it harbors antioxidative stress genes. Antioxidant genes are controlled by pathway-specific sensors that act in response to growth conditions. Although many families of oxidation-sensing regulators in C. glutamicum have been well described, members of the xenobiotic-response element (XRE) family, involved in oxidative stress, remain elusive. Results In this study, we report a novel redox-sensitive member of the XER family, MsrR (multiple stress resistance regulator). MsrR is encoded as part of the msrR-3-mst (3-mercaptopyruvate sulfurtransferase) operon; msrR-3-mst is divergent from multidrug efflux protein MFS. MsrR was demonstrated to bind to the intergenic region between msrR-3-mst and mfs. This binding was prevented by an MsrR oxidation-mediated increase in MsrR dimerization. MsrR was shown to use Cys62 oxidation to sense oxidative stress, resulting in its dissociation from the promoter. Elevated expression of msrR-3-mst and mfs was observed under stress. Furthermore, a ΔmsrR mutant strain displayed significantly enhanced growth, while the growth of strains lacking either 3-mst or mfs was significantly inhibited under stress. Conclusion This report is the first to demonstrate the critical role of MsrR-3-MST-MFS in bacterial stress resistance.
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Affiliation(s)
- Meiru Si
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China.
| | - Can Chen
- College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, 466001, Henan, China
| | - Jingyi Zhong
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Xiaona Li
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Yang Liu
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Tao Su
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Ge Yang
- College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China.
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Lee JH, Jeong H, Kim Y, Lee HS. Corynebacterium glutamicum whiA plays roles in cell division, cell envelope formation, and general cell physiology. Antonie van Leeuwenhoek 2019; 113:629-641. [DOI: 10.1007/s10482-019-01370-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 11/30/2019] [Indexed: 10/25/2022]
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The osnR gene of Corynebacterium glutamicum plays a negative regulatory role in oxidative stress responses. ACTA ACUST UNITED AC 2019; 46:241-248. [DOI: 10.1007/s10295-018-02126-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 12/20/2018] [Indexed: 11/26/2022]
Abstract
Abstract
Among the Corynebacterium glutamicum ORFs that have been implicated in stress responses, we chose ORF cg3230, designated osnR, and analyzed it further. Unlike the osnR-deleted strain (ΔosnR), the osnR-overexpressing strain (P180-osnR) developed growth defects and increased sensitivity to various oxidants including H2O2. Transcription in the P180-osnR strain of genes such as sodA (superoxide dismutase), ftn (ferritin biosynthesis), and ahpD (alkyl hydroperoxide reductase; cg2674), which are involved in the detoxification of reactive oxygen species, was only 40% that of the wild type. However, transcription of katA, encoding H2O2-detoxifying catalase, was unchanged in this strain. Genes such as trxB (thioredoxin reductase) and mtr (mycothiol disulfide reductase), which play roles in redox homeostasis, also showed decreased transcription in the strain. 2D-PAGE analysis indicated that genes involved in redox reactions were considerably affected by osnR overexpression. The NADPH/NADP+ ratio of the P180-osnR strain (1.35) was higher than that of the wild-type stain (0.78). Collectively, the phenotypes of the ΔosnR and P180-osnR strains suggest a global regulatory role as well as a negative role for the gene in stress responses, particularly in katA-independent oxidative stress responses.
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Hong EJ, Jeong H, Lee DS, Kim Y, Lee HS. TheahpDgene ofCorynebacterium glutamicumplays an important role in hydrogen peroxide-induced oxidative stress response. J Biochem 2018; 165:197-204. [DOI: 10.1093/jb/mvy097] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 11/14/2018] [Indexed: 12/17/2022] Open
Affiliation(s)
- Eun-Ji Hong
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si, Korea
| | - Haeri Jeong
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si, Korea
| | - Dong-Seok Lee
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si, Korea
| | - Younhee Kim
- Department of Korean Medicine, Semyung University, 65 Semyeong-ro, Jecheon-si, Chungbuk, Korea
| | - Heung-Shick Lee
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si, Korea
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Liu X, Yang S, Wang F, Dai X, Yang Y, Bai Z. RETRACTED ARTICLE: Comparative analysis of the Corynebacterium glutamicum transcriptome in response to changes in dissolved oxygen levels. ACTA ACUST UNITED AC 2017; 44:181-195. [DOI: 10.1007/s10295-016-1854-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 10/30/2016] [Indexed: 12/13/2022]
Abstract
Abstract
The dissolved oxygen (DO) level of a culture of Corynebacterium glutamicum (C. glutamicum) in a bioreactor has a significant impact on the cellular redox potential and the distribution of energy and metabolites. In this study, to gain a deeper understanding of the effects of DO on the metabolism of C. glutamicum, we sought to systematically explore the influence of different DO concentrations on genetic regulation and metabolism through transcriptomic analysis. The results revealed that after 20 h of fermentation, oxygen limitation enhanced the glucose metabolism, pyruvate metabolism and carbon overflow, and restricted NAD+ availability. A high oxygen supply enhanced the TCA cycle and reduced glyoxylate metabolism. Several key genes involved in response of C. glutamicum to different oxygen concentrations were examined, which provided suggestions for target site modifications in developing optimized oxygen supply strategies. These data provided new insights into the relationship between oxygen supply and metabolism of C. glutamicum.
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Affiliation(s)
- Xiuxia Liu
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
| | - Sun Yang
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
| | - Fen Wang
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
| | - Xiaofeng Dai
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
| | - Yankun Yang
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
| | - Zhonghu Bai
- grid.258151.a 0000000107081323 National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
- grid.258151.a 0000000107081323 The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology Jiangnan University 214122 Wuxi China
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