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Román-Camacho JJ, Mauricio JC, Sánchez-León I, Santos-Dueñas IM, Fuentes-Almagro CA, Amil-Ruiz F, García-Martínez T, García-García I. Implementation of a Novel Method for Processing Proteins from Acetic Acid Bacteria via Liquid Chromatography Coupled with Tandem Mass Spectrometry. Molecules 2024; 29:2548. [PMID: 38893424 PMCID: PMC11173641 DOI: 10.3390/molecules29112548] [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: 04/14/2024] [Revised: 05/22/2024] [Accepted: 05/27/2024] [Indexed: 06/21/2024] Open
Abstract
Acetic acid bacteria (AAB) and other members of the complex microbiotas, whose activity is essential for vinegar production, display biodiversity and richness that is difficult to study in depth due to their highly selective culture conditions. In recent years, liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) has emerged as a powerful tool for rapidly identifying thousands of proteins present in microbial communities, offering broader precision and coverage. In this work, a novel method based on LC-MS/MS was established and developed from previous studies. This methodology was tested in three studies, enabling the characterization of three submerged acetification profiles using innovative raw materials (synthetic alcohol medium, fine wine, and craft beer) while working in a semicontinuous mode. The biodiversity of existing microorganisms was clarified, and both the predominant taxa (Komagataeibacter, Acetobacter, Gluconacetobacter, and Gluconobacter) and others never detected in these media (Asaia and Bombella, among others) were identified. The key functions and adaptive metabolic strategies were determined using comparative studies, mainly those related to cellular material biosynthesis, energy-associated pathways, and cellular detoxification processes. This study provides the groundwork for a highly reliable and reproducible method for the characterization of microbial profiles in the vinegar industry.
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Affiliation(s)
- Juan J. Román-Camacho
- Department of Agricultural Chemistry, Edaphology and Microbiology Agrifood Campus of International Excellence ceiA3, University of Cordoba, 14014 Cordoba, Spain; (J.J.R.-C.); (I.S.-L.); (T.G.-M.)
| | - Juan C. Mauricio
- Department of Agricultural Chemistry, Edaphology and Microbiology Agrifood Campus of International Excellence ceiA3, University of Cordoba, 14014 Cordoba, Spain; (J.J.R.-C.); (I.S.-L.); (T.G.-M.)
| | - Irene Sánchez-León
- Department of Agricultural Chemistry, Edaphology and Microbiology Agrifood Campus of International Excellence ceiA3, University of Cordoba, 14014 Cordoba, Spain; (J.J.R.-C.); (I.S.-L.); (T.G.-M.)
| | - Inés M. Santos-Dueñas
- Department of Inorganic Chemistry and Chemical Engineering, Agrifood Campus of International Excellence ceiA3, Institute of Chemistry for Energy and Environment (IQUEMA), University of Cordoba, 14014 Cordoba, Spain; (I.M.S.-D.); (I.G.-G.)
| | - Carlos A. Fuentes-Almagro
- Proteomics Unit, Central Service for Research Support (SCAI), University of Cordoba, 14014 Cordoba, Spain;
| | - Francisco Amil-Ruiz
- Bioinformatics Unit, Central Service for Research Support (SCAI), University of Cordoba, 14014 Cordoba, Spain;
| | - Teresa García-Martínez
- Department of Agricultural Chemistry, Edaphology and Microbiology Agrifood Campus of International Excellence ceiA3, University of Cordoba, 14014 Cordoba, Spain; (J.J.R.-C.); (I.S.-L.); (T.G.-M.)
| | - Isidoro García-García
- Department of Inorganic Chemistry and Chemical Engineering, Agrifood Campus of International Excellence ceiA3, Institute of Chemistry for Energy and Environment (IQUEMA), University of Cordoba, 14014 Cordoba, Spain; (I.M.S.-D.); (I.G.-G.)
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2
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El-Askri T, Yatim M, Sehli Y, Rahou A, Belhaj A, Castro R, Durán-Guerrero E, Hafidi M, Zouhair R. Screening and Characterization of New Acetobacter fabarum and Acetobacter pasteurianus Strains with High Ethanol−Thermo Tolerance and the Optimization of Acetic Acid Production. Microorganisms 2022; 10:microorganisms10091741. [PMID: 36144343 PMCID: PMC9500637 DOI: 10.3390/microorganisms10091741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/16/2022] Open
Abstract
The production of vinegar on an industrial scale from different raw materials is subject to constraints, notably the low tolerance of acetic acid bacteria (AAB) to high temperatures and high ethanol concentrations. In this study, we used 25 samples of different fruits from seven Moroccan biotopes with arid and semi-arid environmental conditions as a basic substrate to isolate thermo- and ethanol-tolerant AAB strains. The isolation and morphological, biochemical and metabolic characterization of these bacteria allowed us to isolate a total number of 400 strains with characters similar to AAB, of which six strains (FAGD1, FAGD10, FAGD18 and GCM2, GCM4, GCM15) were found to be mobile and immobile Gram-negative bacteria with ellipsoidal rod-shaped colonies that clustered in pairs and in isolated chains. These strains are capable of producing acetic acid from ethanol, growing on peptone and oxidizing acetate to CO2 and H2O. Strains FAGD1, FAGD10 and FAGD18 show negative growth on YPG medium containing D-glucose > 30%, while strains GCM2, GCM4 and GCM15 show positive growth. These six strains stand out on CARR indicator medium as isolates of the genus Acetobacter ssp. Analysis of 16S rDNA gene sequencing allowed us to differentiate these strains as Acetobacter fabarum and Acetobacter pasteurianus. The study of the tolerance of these six isolates towards pH showed that most of the six strains are unable to grow at pH 3 and pH 9, with an ideal pH of 5. The behavior of the six strains at different concentrations of ethanol shows an optimal production of acetic acid after incubation at concentrations between 6% and 8% (v/v) of ethanol. All six strains tolerated an ethanol concentration of 16% (v/v). The resistance of the strains to acetic acid differs between the species of AAB. The optimum acetic acid production is obtained at a concentration of 1% (v/v) for the strains of FAGD1, FAGD10 and FAGD18, and 3% (v/v) for GCM2, GCM4 and GCM15. These strains are able to tolerate an acetic acid concentration of up to 6% (v/v). The production kinetics of the six strains show the highest levels of growth and acetic acid production at 30 °C. This rate of growth and acetic acid production is high at 35 °C, 37 °C and 40 °C. Above 40 °C, the production of acid is reduced. All six strains continue to produce acetic acid, even at high temperatures up to 48 °C. These strains can be used in the vinegar production industry to minimize the load on cooling systems, especially in countries with high summer temperatures.
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Affiliation(s)
- Taoufik El-Askri
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
- Analytical Chemistry Department, Faculty of Sciences-IVAGRO, Agrifood Campus of International Excellence (CeiA3), University of Cadiz, Polígono Río San Pedro, s/n, 11510 Cadiz, Spain
- Correspondence: ; Tel.: +212-706-801-037
| | - Meriem Yatim
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
| | - Youness Sehli
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
| | - Abdelilah Rahou
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
| | - Abdelhaq Belhaj
- Laboratory of Ecology and Biodiversity of Wetlands Team, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
| | - Remedios Castro
- Analytical Chemistry Department, Faculty of Sciences-IVAGRO, Agrifood Campus of International Excellence (CeiA3), University of Cadiz, Polígono Río San Pedro, s/n, 11510 Cadiz, Spain
| | - Enrique Durán-Guerrero
- Analytical Chemistry Department, Faculty of Sciences-IVAGRO, Agrifood Campus of International Excellence (CeiA3), University of Cadiz, Polígono Río San Pedro, s/n, 11510 Cadiz, Spain
| | - Majida Hafidi
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
| | - Rachid Zouhair
- Laboratory of Plant Biotechnology and Bio-Resources Valorization, Department of Biology, Faculty of Sciences, Moulay Ismail University, Zitoune, Meknes 50050, Morocco
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3
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Yang H, Chen T, Wang M, Zhou J, Liebl W, Barja F, Chen F. Molecular biology: Fantastic toolkits to improve knowledge and application of acetic acid bacteria. Biotechnol Adv 2022; 58:107911. [PMID: 35033586 DOI: 10.1016/j.biotechadv.2022.107911] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 12/27/2021] [Accepted: 01/09/2022] [Indexed: 12/24/2022]
Abstract
Acetic acid bacteria (AAB) are a group of gram-negative, obligate aerobic bacteria within the Acetobacteraceae family of the alphaproteobacteria class, which are distributed in a wide variety of different natural sources that are rich in sugar and alcohols, as well as in several traditionally fermented foods. Their capabilities are not limited to the production of acetic acid and the brewing of vinegar, as their names suggest. They can also fix nitrogen and produce various kinds of aldehydes, ketones and other organic acids by incomplete oxidation (also referred to as oxidative fermentation) of the corresponding alcohols and/or sugars, as well as pigments and exopolysaccharides (EPS). In order to gain more insight into these organisms, molecular biology techniques have been extensively applied in almost all aspects of AAB research, including their identification and classification, acid resistance mechanisms, oxidative fermentation, EPS production, thermotolerance and so on. In this review, we mainly focus on the application of molecular biological technologies in the advancement of research into AAB while presenting the progress of the latest studies using these techniques.
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Affiliation(s)
- Haoran Yang
- Hubei International Scientific and Technological Cooperation Base of Traditional Fermented Foods, Huazhong Agricultural University, Wuhan, Hubei, China; College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Tao Chen
- Hubei International Scientific and Technological Cooperation Base of Traditional Fermented Foods, Huazhong Agricultural University, Wuhan, Hubei, China; College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Min Wang
- State Key Laboratory of Food Nutrition and Safety, College of Biotechnology, Tianjin University of Science &Technology, Tianjin, China
| | - Jingwen Zhou
- School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, China
| | | | - François Barja
- Microbiology Unit, Department of Botany and Plant Biology, University of Geneva, Sciences III, Geneva, Switzerland
| | - Fusheng Chen
- Hubei International Scientific and Technological Cooperation Base of Traditional Fermented Foods, Huazhong Agricultural University, Wuhan, Hubei, China; College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
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4
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WANG LITING, HONG HOUSHENG, ZHANG CHENGBO, HUANG ZUNXI, GUO HUIMING. Transcriptome Analysis of Komagataeibacter europaeus CGMCC 20445 Responses to Different Acidity Levels During Acetic Acid Fermentation. Pol J Microbiol 2021; 70:305-313. [PMID: 34584524 PMCID: PMC8459000 DOI: 10.33073/pjm-2021-027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 06/19/2021] [Accepted: 06/20/2021] [Indexed: 01/13/2023] Open
Abstract
In the industrial production of high-acidity vinegar, the initial ethanol and acetic acid concentrations are limiting factors that will affect acetic acid fermentation. In this study, Komagataeibacter europaeus CGMCC 20445 was used for acetic acid shake flask fermentation at an initial ethanol concentration of 4.3% (v/v). We conducted transcriptome analysis of K. europaeus CGMCC 20445 samples under different acidity conditions to elucidate the changes in differentially expressed genes throughout the fermentation process. We also analyzed the expression of genes associated with acid-resistance mechanisms. Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis showed that the differentially expressed genes were enriched in ribosomes, citrate cycle, butanoate metabolism, oxidative phosphorylation, pentose phosphate, and the fatty acid biosynthetic pathways. In addition, this study found that K. europaeus CGMCC 20445 regulates the gene expression levels of cell envelope proteins and stress-responsive proteins to adapt to the gradual increase in acidity during acetic acid fermentation. This study improved the understanding of the acid resistance mechanism of K. europaeus and provided relevant reference information for the further genetic engineering of this bacterium.
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Affiliation(s)
- LITING WANG
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, China
| | - HOUSHENG HONG
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - CHENGBO ZHANG
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, China
| | - ZUNXI HUANG
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, China
| | - HUIMING GUO
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, China
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5
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Román-Camacho JJ, Mauricio JC, Santos-Dueñas IM, García-Martínez T, García-García I. Functional metaproteomic analysis of alcohol vinegar microbiota during an acetification process: A quantitative proteomic approach. Food Microbiol 2021; 98:103799. [PMID: 33875225 DOI: 10.1016/j.fm.2021.103799] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 03/20/2021] [Accepted: 03/30/2021] [Indexed: 11/16/2022]
Abstract
Vinegar is elaborated using a semi-continuous submerged culture of a complex microbiota of acetic acid bacteria. The genus Komagataeibacter provides much of the proteins of the metaproteome, being K. europaeus the main species working in this environment. In this work, the protein profile of the vinegar microbiota, obtained by means of liquid chromatography-tandem mass spectrometry (LC-MS/MS) in samples from different cycle times of an acetification process using an alcohol medium, has been used to describe the functional metaproteome throughout the process. The analysis was focused on Komagataeibacter species which supplied about 90% of the metaproteome and particularly K. europaeus which accounts for more than 70%. According to these results, the natural behaviour of a microbial community in vinegar has been predicted at a quantitative proteomic level. The results revealed that most of the identified proteins involved in the metabolism of amino acids, biosynthesis of proteins, and energy production related-metabolic pathways increased their expression throughout the cycle loading phase and afterwards experimented a decrease coming into play other proteins acting against acetic acid stress. These findings may facilitate a better understanding of the microbiota's role and contributing to obtain a quality product.
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Affiliation(s)
- Juan J Román-Camacho
- Department of Agricultural Chemistry, Edaphology and Microbiology, Microbiology Area, Severo Ochoa Building (C6), Agrifood Campus of International Excellence ceiA3, University of Cordoba, Ctra. N-IV-A, Km 396, 14014, Córdoba, Spain.
| | - Juan C Mauricio
- Department of Agricultural Chemistry, Edaphology and Microbiology, Microbiology Area, Severo Ochoa Building (C6), Agrifood Campus of International Excellence ceiA3, University of Cordoba, Ctra. N-IV-A, Km 396, 14014, Córdoba, Spain.
| | - Inés M Santos-Dueñas
- Department of Inorganic Chemistry and Chemical Engineering, Chemical Engineering Area, Marie Curie Building (C3), Agrifood Campus of International Excellence ceiA3, University of Cordoba, Ctra. N-IV-A, Km 396, 14014, Córdoba, Spain.
| | - Teresa García-Martínez
- Department of Agricultural Chemistry, Edaphology and Microbiology, Microbiology Area, Severo Ochoa Building (C6), Agrifood Campus of International Excellence ceiA3, University of Cordoba, Ctra. N-IV-A, Km 396, 14014, Córdoba, Spain.
| | - Isidoro García-García
- Department of Inorganic Chemistry and Chemical Engineering, Chemical Engineering Area, Marie Curie Building (C3), Agrifood Campus of International Excellence ceiA3, University of Cordoba, Ctra. N-IV-A, Km 396, 14014, Córdoba, Spain.
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6
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Kim Y, Lama S, Agrawal D, Kumar V, Park S. Acetate as a potential feedstock for the production of value-added chemicals: Metabolism and applications. Biotechnol Adv 2021; 49:107736. [PMID: 33781888 DOI: 10.1016/j.biotechadv.2021.107736] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 02/22/2021] [Accepted: 03/19/2021] [Indexed: 10/21/2022]
Abstract
Acetate is regarded as a promising carbon feedstock in biological production owing to its possible derivation from C1 gases such as CO, CO2 and methane. To best use of acetate, comprehensive understanding of acetate metabolisms from genes and enzymes to pathways and regulations is needed. This review aims to provide an overview on the potential of acetate as carbon feedstock for industrial biotechnology. Biochemical, microbial and biotechnological aspects of acetate metabolism are described. Especially, the current state-of-the art in the production of value-added chemicals from acetate is summarized. Challenges and future perspectives are also provided.
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Affiliation(s)
- Yeonhee Kim
- School of Energy and Chemical Engineering, UNIST, 50, UNIST-gil, Ulsan 44919, Republic of Korea
| | - Suman Lama
- School of Energy and Chemical Engineering, UNIST, 50, UNIST-gil, Ulsan 44919, Republic of Korea
| | - Deepti Agrawal
- Biochemistry and Biotechnology Area, Material Resource Efficiency Division, CSIR- Indian Institute of Petroleum, Mohkampur, Dehradun 248005, India
| | - Vinod Kumar
- Centre for Climate and Environmental Protection, School of Water, Energy and Environment, Cranfield University, Cranfield, MK430AL, United Kingdom.
| | - Sunghoon Park
- School of Energy and Chemical Engineering, UNIST, 50, UNIST-gil, Ulsan 44919, Republic of Korea.
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Li Y, Yang S, Ma D, Song W, Gao C, Liu L, Chen X. Microbial engineering for the production of C 2-C 6 organic acids. Nat Prod Rep 2021; 38:1518-1546. [PMID: 33410446 DOI: 10.1039/d0np00062k] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Covering: up to the end of 2020Organic acids, as building block compounds, have been widely used in food, pharmaceutical, plastic, and chemical industries. Until now, chemical synthesis is still the primary method for industrial-scale organic acid production. However, this process encounters some inevitable challenges, such as depletable petroleum resources, harsh reaction conditions and complex downstream processes. To solve these problems, microbial cell factories provide a promising approach for achieving the sustainable production of organic acids. However, some key metabolites in central carbon metabolism are strictly regulated by the network of cellular metabolism, resulting in the low productivity of organic acids. Thus, multiple metabolic engineering strategies have been developed to reprogram microbial cell factories to produce organic acids, including monocarboxylic acids, hydroxy carboxylic acids, amino carboxylic acids, dicarboxylic acids and monomeric units for polymers. These strategies mainly center on improving the catalytic efficiency of the enzymes to increase the conversion rate, balancing the multi-gene biosynthetic pathways to reduce the byproduct formation, strengthening the metabolic flux to promote the product biosynthesis, optimizing the metabolic network to adapt the environmental conditions and enhancing substrate utilization to broaden the substrate spectrum. Here, we describe the recent advances in producing C2-C6 organic acids by metabolic engineering strategies. In addition, we provide new insights as to when, what and how these strategies should be taken. Future challenges are also discussed in further advancing microbial engineering and establishing efficient biorefineries.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.
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8
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Gao L, Wu X, Xia X, Jin Z. Fine-tuning ethanol oxidation pathway enzymes and cofactor PQQ coordinates the conflict between fitness and acetic acid production by Acetobacter pasteurianus. Microb Biotechnol 2020; 14:643-655. [PMID: 33174682 PMCID: PMC7936290 DOI: 10.1111/1751-7915.13703] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 09/23/2020] [Accepted: 10/22/2020] [Indexed: 12/28/2022] Open
Abstract
The very high concentrations required for industrial production of free acetic acid create toxicity and low pH values, which usually conflict with the host cell growth, leading to a poor productivity. Achieving a balance between cell fitness and product synthesis is the key challenge to improving acetic acid production efficiency in metabolic engineering. Here, we show that the synergistic regulation of alcohol/aldehyde dehydrogenase expression and cofactor PQQ level could not only efficiently relieve conflict between increased acetic acid production and compromised cell fitness, but also greatly enhance acetic acid tolerance of Acetobacter pasteurianus to a high initial concentration (3% v/v) of acetic acid. Combinatorial expression of adhA and pqqABCDE greatly shortens the duration of starting‐up process from 116 to 99 h, leading to a yield of 69 g l‐1 acetic acid in semi‐continuous fermentation. As a final result, average acetic acid productivity has been raised to 0.99 g l‐1 h‐1, which was 32% higher than the parental A. pasteurianus. This study is of great significance for decreasing cost of semi‐continuous fermentation for producing high‐strength acetic acid industrially. We envisioned that this strategy will be useful for production of many other desired organic acids, especially those involving cofactor reactions.
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Affiliation(s)
- Ling Gao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China.,State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Xiaodan Wu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Xiaole Xia
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China.,The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Zhengyu Jin
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
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9
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Gao L, Wu X, Zhu C, Jin Z, Wang W, Xia X. Metabolic engineering to improve the biomanufacturing efficiency of acetic acid bacteria: advances and prospects. Crit Rev Biotechnol 2020; 40:522-538. [DOI: 10.1080/07388551.2020.1743231] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ling Gao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, PR China
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences, Jinan, PR China
| | - Xiaodan Wu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Cailin Zhu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Zhengyu Jin
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, PR China
| | - Wu Wang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Xiaole Xia
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
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10
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Lynch KM, Zannini E, Wilkinson S, Daenen L, Arendt EK. Physiology of Acetic Acid Bacteria and Their Role in Vinegar and Fermented Beverages. Compr Rev Food Sci Food Saf 2019; 18:587-625. [DOI: 10.1111/1541-4337.12440] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 02/06/2019] [Accepted: 02/18/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Kieran M. Lynch
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
| | - Emanuele Zannini
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
| | - Stuart Wilkinson
- Global Innovation & Technology CentreAnheuser‐Busch InBev nv/sa Leuven 3000 Belgium
| | - Luk Daenen
- Global Innovation & Technology CentreAnheuser‐Busch InBev nv/sa Leuven 3000 Belgium
| | - Elke K. Arendt
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
- APC Microbiome IrelandUniv. College Cork Cork T12 K8AF Ireland
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11
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Wu X, Yao H, Cao L, Zheng Z, Chen X, Zhang M, Wei Z, Cheng J, Jiang S, Pan L, Li X. Improving Acetic Acid Production by Over-Expressing PQQ-ADH in Acetobacter pasteurianus. Front Microbiol 2017; 8:1713. [PMID: 28932219 PMCID: PMC5592214 DOI: 10.3389/fmicb.2017.01713] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 08/24/2017] [Indexed: 11/24/2022] Open
Abstract
Pyrroquinoline quinone-dependent alcohol dehydrogenase (PQQ-ADH) is a key enzyme in the ethanol oxidase respiratory chain of acetic acid bacteria (AAB). To investigate the effect of PQQ-ADH on acetic acid production by Acetobacter pasteurianus JST-S, subunits I (adhA) and II (adhB) of PQQ-ADH were over-expressed, the fermentation parameters and the metabolic flux analysis were compared in the engineered strain and the original one. The acetic acid production was improved by the engineered strain (61.42 g L−1) while the residual ethanol content (4.18 g L−1) was decreased. Analysis of 2D maps indicated that 19 proteins were differently expressed between the two strains; of these, 17 were identified and analyzed by mass spectrometry and two-dimensional gel electrophoresis. With further investigation of metabolic flux analysis (MFA) of the pathway from ethanol and glucose, the results reveal that over-expression of PQQ-ADH is an effective way to improve the ethanol oxidation respiratory chain pathway and these can offer theoretical references for potential mechanism of metabolic regulation in AAB and researches with its acetic acid resistance.
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Affiliation(s)
- Xuefeng Wu
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Hongli Yao
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China
| | - Lili Cao
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Zhi Zheng
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Xiaoju Chen
- School of Chemical Engineering and Life Sciences, Chaohu UniversityHefei, China
| | - Min Zhang
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China
| | - Zhaojun Wei
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China
| | - Jieshun Cheng
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Shaotong Jiang
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Lijun Pan
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
| | - Xingjiang Li
- School of Food Science and Engineering, Hefei University of TechnologyHefei, China.,Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of TechnologyHefei, China
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Yin H, Zhang R, Xia M, Bai X, Mou J, Zheng Y, Wang M. Effect of aspartic acid and glutamate on metabolism and acid stress resistance of Acetobacter pasteurianus. Microb Cell Fact 2017; 16:109. [PMID: 28619110 PMCID: PMC5472864 DOI: 10.1186/s12934-017-0717-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 06/05/2017] [Indexed: 11/25/2022] Open
Abstract
Background Acetic acid bacteria (AAB) are widely applied in food, bioengineering and medicine fields. However, the acid stress at low pH conditions limits acetic acid fermentation efficiency and high concentration of vinegar production with AAB. Therefore, how to enhance resistance ability of the AAB remains as the major challenge. Amino acids play an important role in cell growth and cell survival under severe environment. However, until now the effects of amino acids on acetic fermentation and acid stress resistance of AAB have not been fully studied. Results In the present work the effects of amino acids on metabolism and acid stress resistance of Acetobacter pasteurianus were investigated. Cell growth, culturable cell counts, acetic acid production, acetic acid production rate and specific production rate of acetic acid of A. pasteurianus revealed an increase of 1.04, 5.43, 1.45, 3.30 and 0.79-folds by adding aspartic acid (Asp), and cell growth, culturable cell counts, acetic acid production and acetic acid production rate revealed an increase of 0.51, 0.72, 0.60 and 0.94-folds by adding glutamate (Glu), respectively. For a fully understanding of the biological mechanism, proteomic technology was carried out. The results showed that the strengthening mechanism mainly came from the following four aspects: (1) Enhancing the generation of pentose phosphates and NADPH for the synthesis of nucleic acid, fatty acids and glutathione (GSH) throughout pentose phosphate pathway. And GSH could protect bacteria from low pH, halide, oxidative stress and osmotic stress by maintaining the viability of cells through intracellular redox equilibrium; (2) Reinforcing deamination of amino acids to increase intracellular ammonia concentration to maintain stability of intracellular pH; (3) Enhancing nucleic acid synthesis and reparation of impaired DNA caused by acid stress damage; (4) Promoting unsaturated fatty acids synthesis and lipid transport, which resulted in the improvement of cytomembrane fluidity, stability and integrity. Conclusions The present work is the study to show the effectiveness of Asp and Glu on metabolism and acid stress resistance of A. pasteurianus as well as their working mechanism. The research results will be helpful for development of nutrient salts, the optimization and regulation of high concentration of cider vinegar production process. Electronic supplementary material The online version of this article (doi:10.1186/s12934-017-0717-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Haisong Yin
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China.,School of Bioengineering, Tianjin Modern Vocational Technology College, Tianjin, 300350, People's Republic of China
| | - Renkuan Zhang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China
| | - Menglei Xia
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China
| | - Xiaolei Bai
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China
| | - Jun Mou
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China
| | - Yu Zheng
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China
| | - Min Wang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, People's Republic of China.
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13
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Culture medium pH influence on Gluconacetobacter physiology: Cellulose production rate and yield enhancement in presence of multiple carbon sources. Carbohydr Polym 2016; 146:282-91. [DOI: 10.1016/j.carbpol.2016.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 01/10/2016] [Accepted: 02/01/2016] [Indexed: 12/14/2022]
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14
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Andrés-Barrao C, Saad MM, Cabello Ferrete E, Bravo D, Chappuis ML, Ortega Pérez R, Junier P, Perret X, Barja F. Metaproteomics and ultrastructure characterization of Komagataeibacter spp. involved in high-acid spirit vinegar production. Food Microbiol 2016; 55:112-22. [DOI: 10.1016/j.fm.2015.10.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/15/2015] [Accepted: 10/18/2015] [Indexed: 02/06/2023]
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15
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Wang Z, Zang N, Shi J, Feng W, Liu Y, Liang X. Comparative Proteome of Acetobacter pasteurianus Ab3 During the High Acidity Rice Vinegar Fermentation. Appl Biochem Biotechnol 2015; 177:1573-88. [PMID: 26369782 DOI: 10.1007/s12010-015-1838-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 09/07/2015] [Indexed: 01/20/2023]
Abstract
As a traditional Asian food for several centuries, vinegar is known to be produced by acetic acid bacteria. The Acetobacter species is the primary starter for vinegar fermentation and has evolutionarily acquired acetic acid resistance, in which Acetobacter pasteurianus Ab3 is routinely used for industrial production of rice vinegar with a high acidity (9 %, w/v). In contrast to the documented short-term and low acetic acid effects on A. pasteurianus, here we investigated the molecular and cellular signatures of long-term and high acetic acid responses by proteomic profiling with bidimensional gel electrophoresis and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI TOF/MS) analyses. Protein spots of interest were selected based on the threshold ANOVA p value of 0.05 and minimal twofold of differential expression, leading to the identification of 26 proteins that are functionally enriched in oxidoreductase activity, cell membrane, and metabolism. The alterations in protein functioning in respiratory chain and protein denaturation may underlay cellular modifications at the outer membrane. Significantly, we found that at higher acidity fermentation phase, the A. pasteurianus Ab3 cells would adapt to distinct physiological processes from that of an ordinary vinegar fermentation with intermediate acidity, indicating increasing energy requirement and dependency of membrane integrity during the transition of acetic acid production. Together, our study provided new insights into the adaptation mechanisms in A. pasteurianus to high acetic acid environments and yield novel regulators and key pathways during the development of acetic acid resistance.
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Affiliation(s)
- Zhe Wang
- Department of Biochemical Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Ning Zang
- Medical Scientific Research Center, Guangxi Medical University, Nanning, 530021, China
| | - Jieyan Shi
- Department of Biochemical Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Wei Feng
- Hangzhou Xihu Brewing Company, Hangzhou, 310012, China
| | - Ye Liu
- Hangzhou Xihu Brewing Company, Hangzhou, 310012, China
| | - Xinle Liang
- Department of Biochemical Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
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16
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Adaptation and tolerance of bacteria against acetic acid. Appl Microbiol Biotechnol 2015; 99:6215-29. [DOI: 10.1007/s00253-015-6762-3] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/05/2015] [Accepted: 06/15/2015] [Indexed: 10/23/2022]
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17
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Liu Y, Tang H, Lin Z, Xu P. Mechanisms of acid tolerance in bacteria and prospects in biotechnology and bioremediation. Biotechnol Adv 2015; 33:1484-92. [PMID: 26057689 DOI: 10.1016/j.biotechadv.2015.06.001] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 06/02/2015] [Accepted: 06/02/2015] [Indexed: 02/05/2023]
Abstract
Acidogenic and aciduric bacteria have developed several survival systems in various acidic environments to prevent cell damage due to acid stress such as that on the human gastric surface and in the fermentation medium used for industrial production of acidic products. Common mechanisms for acid resistance in bacteria are proton pumping by F1-F0-ATPase, the glutamate decarboxylase system, formation of a protective cloud of ammonia, high cytoplasmic urease activity, repair or protection of macromolecules, and biofilm formation. The field of synthetic biology has rapidly advanced and generated an ever-increasing assortment of genetic devices and biological modules for applications in biofuel and novel biomaterial productions. Better understanding of aspects such as overproduction of general shock proteins, molecular mechanisms, and responses to cell density adopted by microorganisms for survival in low pH conditions will prove useful in synthetic biology for potential industrial and environmental applications.
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Affiliation(s)
- Yuping Liu
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Hongzhi Tang
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Zhanglin Lin
- Department of Chemical Engineering, Tsinghua University, One Tsinghua Garden Road, Beijing 100084, People's Republic of China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
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18
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Zhang Z, Ma H, Yang Y, Dai L, Chen K. Protein profile of Acetobacter pasteurianus HSZ3-21. Curr Microbiol 2015; 70:724-9. [PMID: 25648427 DOI: 10.1007/s00284-015-0777-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 12/12/2014] [Indexed: 11/26/2022]
Abstract
Acetobacter pasteurianus plays an important role in the process of traditional vinegar production and is also essential for the fermentation of Zhenjiang aromatic vinegar. In this study, we utilized the proteomic approach to analyze the proteomic profile of A. pasteurianus HSZ3-21, and 258 proteins were successfully identified by MALDI-TOF-MS and database search. The hydropathy and GO analyse combined with COG results of the identified proteins revealed the molecular biological characteristics of A. pasteurianus proteins, that is, most proteins of A. pasteurianus were related to metabolic process, binding, catalytic or cellular response. Meanwhile, our results also showed that some proteins of A. pasteurianus may be responsible for acetic acid tolerance, thermotolerance, and stress response. Therefore, the identification of 258 proteins not only deciphers protein composition and functional classification of A. pasteurianus, but also provides useful information for improving quality of Zhenjiang aromatic vinegar.
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Affiliation(s)
- Zhiyan Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, Jiangsu, People's Republic of China,
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19
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Overview on mechanisms of acetic acid resistance in acetic acid bacteria. World J Microbiol Biotechnol 2015; 31:255-63. [PMID: 25575804 DOI: 10.1007/s11274-015-1799-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Accepted: 01/05/2015] [Indexed: 10/24/2022]
Abstract
Acetic acid bacteria (AAB) are a group of gram-negative or gram-variable bacteria which possess an obligate aerobic property with oxygen as the terminal electron acceptor, meanwhile transform ethanol and sugar to corresponding aldehydes, ketones and organic acids. Since the first genus Acetobacter of AAB was established in 1898, 16 AAB genera have been recorded so far. As the main producer of a world-wide condiment, vinegar, AAB have evolved an elegant adaptive system that enables them to survive and produce a high concentration of acetic acid. Some researches and reviews focused on mechanisms of acid resistance in enteric bacteria and made the mechanisms thoroughly understood, while a few investigations did in AAB. As the related technologies with proteome, transcriptome and genome were rapidly developed and applied to AAB research, some plausible mechanisms conferring acetic acid resistance in some AAB strains have been published. In this review, the related mechanisms of AAB against acetic acid with acetic acid assimilation, transportation systems, cell morphology and membrane compositions, adaptation response, and fermentation conditions will be described. Finally, a framework for future research for anti-acid AAB will be provided.
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20
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Akasaka N, Astuti W, Ishii Y, Hidese R, Sakoda H, Fujiwara S. Change in the plasmid copy number in acetic acid bacteria in response to growth phase and acetic acid concentration. J Biosci Bioeng 2015; 119:661-8. [PMID: 25575969 DOI: 10.1016/j.jbiosc.2014.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 10/14/2014] [Accepted: 11/04/2014] [Indexed: 10/24/2022]
Abstract
Plasmids pGE1 (2.5 kb), pGE2 (7.2 kb), and pGE3 (5.5 kb) were isolated from Gluconacetobacter europaeus KGMA0119, and sequence analyses revealed they harbored 3, 8, and 4 genes, respectively. Plasmid copy numbers (PCNs) were determined by real-time quantitative PCR at different stages of bacterial growth. When KGMA0119 was cultured in medium containing 0.4% ethanol and 0.5% acetic acid, PCN of pGE1 increased from 7 copies/genome in the logarithmic phase to a maximum of 12 copies/genome at the beginning of the stationary phase, before decreasing to 4 copies/genome in the late stationary phase. PCNs for pGE2 and pGE3 were maintained at 1-3 copies/genome during all phases of growth. Under a higher concentration of ethanol (3.2%) the PCN for pGE1 was slightly lower in all the growth stages, and those of pGE2 and pGE3 were unchanged. In the presence of 1.0% acetic acid, PCNs were higher for pGE1 (10 copies/genome) and pGE3 (6 copies/genome) during the logarithmic phase. Numbers for pGE2 did not change, indicating that pGE1 and pGE3 increase their PCNs in response to acetic acid. Plasmids pBE2 and pBE3 were constructed by ligating linearized pGE2 and pGE3 into pBR322. Both plasmids were replicable in Escherichia coli, Acetobacter pasteurianus and G. europaeus, highlighting their suitability as vectors for acetic acid bacteria.
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Affiliation(s)
- Naoki Akasaka
- Institute of Applied Microbiology, Marukan Vinegar Co. Ltd., 5-6 Koyo-cho West, Higashinada-ku, Kobe, Hyogo 658-0033, Japan
| | - Wiwik Astuti
- Department of Bioscience, Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Yuri Ishii
- Department of Bioscience, Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Ryota Hidese
- Research Center for Environmental Bioscience, Graduate School of Science and Technology, Kwansei-Gakuin University, Sanda, Hyogo 669-1337, Japan
| | - Hisao Sakoda
- Institute of Applied Microbiology, Marukan Vinegar Co. Ltd., 5-6 Koyo-cho West, Higashinada-ku, Kobe, Hyogo 658-0033, Japan
| | - Shinsuke Fujiwara
- Department of Bioscience, Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan; Research Center for Environmental Bioscience, Graduate School of Science and Technology, Kwansei-Gakuin University, Sanda, Hyogo 669-1337, Japan.
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21
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Qi Z, Yang H, Xia X, Wang W, Yu X. High strength vinegar fermentation by Acetobacter pasteurianus via enhancing alcohol respiratory chain. BIOTECHNOL BIOPROC E 2014. [DOI: 10.1007/s12257-013-0727-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Qi Z, Yang H, Xia X, Xin Y, Zhang L, Wang W, Yu X. A protocol for optimization vinegar fermentation according to the ratio of oxygen consumption versus acid yield. J FOOD ENG 2013. [DOI: 10.1016/j.jfoodeng.2012.12.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Sakurai K, Arai H, Ishii M, Igarashi Y. Changes in the gene expression profile of Acetobacter aceti during growth on ethanol. J Biosci Bioeng 2012; 113:343-8. [DOI: 10.1016/j.jbiosc.2011.11.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 10/28/2011] [Accepted: 11/07/2011] [Indexed: 11/30/2022]
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24
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Andrés-Barrao C, Saad MM, Chappuis ML, Boffa M, Perret X, Ortega Pérez R, Barja F. Proteome analysis of Acetobacter pasteurianus during acetic acid fermentation. J Proteomics 2011; 75:1701-17. [PMID: 22155126 DOI: 10.1016/j.jprot.2011.11.027] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 11/06/2011] [Accepted: 11/22/2011] [Indexed: 12/29/2022]
Abstract
Acetic acid bacteria (AAB) are Gram-negative, strictly aerobic microorganisms that show a unique resistance to ethanol (EtOH) and acetic acid (AcH). Members of the Acetobacter and Gluconacetobacter genera are capable of transforming EtOH into AcH via the alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) enzymes and are used for the industrial production of vinegar. Several mechanisms have been proposed to explain how AAB resist high concentrations of AcH, such as the assimilation of acetate through the tricarboxylic acid (TCA) cycle, the export of acetate by various transporters and modifications of the outer membrane. However, except for a few acetate-specific proteins, little is known about the global proteome responses to AcH. In this study, we used 2D-DIGE to compare the proteome of Acetobacter pasteurianus LMG 1262(T) when growing in glucose or ethanol and in the presence of acetic acid. Interesting protein spots were selected using the ANOVA p-value of 0.05 as threshold and 1.5-fold as the minimal level of differential expression, and a total of 53 proteins were successfully identified. Additionally, the size of AAB was reduced by approximately 30% in length as a consequence of the acidity. A modification in the membrane polysaccharides was also revealed by PATAg specific staining.
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Affiliation(s)
- Cristina Andrés-Barrao
- Department of Botany and Plant Biology, Microbiology Unit, University of Geneva, Chemin des Embrouchis 10, CH-1254 Jussy-Geneva, Switzerland
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25
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Sakurai K, Arai H, Ishii M, Igarashi Y. Transcriptome response to different carbon sources in Acetobacter aceti. Microbiology (Reading) 2011; 157:899-910. [DOI: 10.1099/mic.0.045906-0] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The draft genome sequence of Acetobacter aceti NBRC 14818 was determined by whole-genome shotgun sequencing and the transcriptome profile in cells exponentially grown on ethanol, acetate or glucose was analysed by using a DNA microarray. The genes for all enzymes that constitute the complete tricarboxylic acid (TCA) cycle and glyoxylate pathway were identified in the genome. The TCA cycle genes showed higher expression levels in A. aceti cells grown on acetate or glucose and the glyoxylate pathway genes were significantly induced by ethanol or acetate. Many SOS-response genes were upregulated in cells grown on ethanol, indicating that ethanol provoked damage of DNA and proteins. The superoxide dismutase and catalase genes showed high expression levels in culture on glucose, indicating that oxidation of glucose induced oxidative stress. A. aceti NBRC 14818 was found to have a highly branched respiratory chain. The genes for two type I and one type II NADH dehydrogenase were identified. The genes for one of the type I enzymes were highly expressed when cells were grown on acetate or glucose, but were significantly downregulated in culture on ethanol, probably because ubiquinones were directly reduced by pyrroloquinoline quinone-dependent alcohol dehydrogenase. Four sets of the genes for quinol oxidases, one bo
3-type (BO3), one bd-type and two cyanide-insensitive-types (CIOs), were identified in the genome. The genes for BO3, which might have proton-pumping activity, were highly expressed under the conditions tested, but were downregulated in the glucose culture. In contrast, the genes for one of the CIOs were significantly upregulated in cells grown on glucose. The two CIOs, which are expected to have lower energy-coupling efficiency, seemed to have a higher contribution in glucose-grown cells. These results indicate that energy conservation efficiency is fine-tuned by changing the respiratory components according to the growth conditions in A. aceti cells.
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Affiliation(s)
- Kenta Sakurai
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hiroyuki Arai
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Masaharu Ishii
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yasuo Igarashi
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
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26
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Zheng Y, Zhang K, Wang C, Liu H, Luo J, Wang M. Improving acetic acid production of Acetobacter pasteurianus AC2005 in hawthorn vinegar fermentation by using beer for seed culture. Int J Food Sci Technol 2010. [DOI: 10.1111/j.1365-2621.2010.02413.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Masud U, Matsushita K, Theeragool G. Cloning and functional analysis of adhS gene encoding quinoprotein alcohol dehydrogenase subunit III from Acetobacter pasteurianus SKU1108. Int J Food Microbiol 2010; 138:39-49. [DOI: 10.1016/j.ijfoodmicro.2009.12.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 12/25/2009] [Accepted: 12/29/2009] [Indexed: 11/28/2022]
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28
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Fermentation and metabolic characteristics of Gluconacetobacter oboediens for different carbon sources. Appl Microbiol Biotechnol 2010; 87:127-36. [DOI: 10.1007/s00253-010-2474-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Revised: 01/22/2010] [Accepted: 01/25/2010] [Indexed: 11/26/2022]
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Abstract
The acetic acid bacteria (AAB) have important roles in food and beverage production, as well as in the bioproduction of industrial chemicals. In recent years, there have been major advances in understanding their taxonomy, molecular biology, and physiology, and in methods for their isolation and identification. AAB are obligate aerobes that oxidize sugars, sugar alcohols, and ethanol with the production of acetic acid as the major end product. This special type of metabolism differentiates them from all other bacteria. Recently, the AAB taxonomy has been strongly rearranged as new techniques using 16S rRNA sequence analysis have been introduced. Currently, the AAB are classified in ten genera in the family Acetobacteriaceae. AAB can not only play a positive role in the production of selected foods and beverages, but they can also spoil other foods and beverages. AAB occur in sugar- and alcohol-enriched environments. The difficulty of cultivation of AAB on semisolid media in the past resulted in poor knowledge of the species present in industrial processes. The first step of acetic acid production is the conversion of ethanol from a carbohydrate carried out by yeasts, and the second step is the oxidation of ethanol to acetic acid carried out by AAB. Vinegar is traditionally the product of acetous fermentation of natural alcoholic substrates. Depending on the substrate, vinegars can be classified as fruit, starch, or spirit substrate vinegars. Although a variety of bacteria can produce acetic acid, mostly members of Acetobacter, Gluconacetobacter, and Gluconobacter are used commercially. Industrial vinegar manufacturing processes fall into three main categories: slow processes, quick processes, and submerged processes. AAB also play an important role in cocoa production, which represents a significant means of income for some countries. Microbial cellulose, produced by AAB, possesses some excellent physical properties and has potential for many applications. Other products of biotransformations by AAB or their enzymes include 2-keto-L-gulonic acid, which is used for the production of vitamin C; D-tagatose, which is used as a bulking agent in food and a noncalorific sweetener; and shikimate, which is a key intermediate for a large number of antibiotics. Recently, for the first time, a pathogenic acetic acid bacterium was described, representing the newest and tenth genus of AAB.
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Affiliation(s)
- Peter Raspor
- Department of Food Science and Technology, University of Ljubljana, Ljubljana, Slovenia
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30
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Nakano S, Fukaya M. Analysis of proteins responsive to acetic acid in Acetobacter: Molecular mechanisms conferring acetic acid resistance in acetic acid bacteria. Int J Food Microbiol 2008; 125:54-9. [DOI: 10.1016/j.ijfoodmicro.2007.05.015] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Revised: 05/08/2007] [Accepted: 05/16/2007] [Indexed: 11/26/2022]
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31
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A specialized citric acid cycle requiring succinyl-coenzyme A (CoA):acetate CoA-transferase (AarC) confers acetic acid resistance on the acidophile Acetobacter aceti. J Bacteriol 2008; 190:4933-40. [PMID: 18502856 DOI: 10.1128/jb.00405-08] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Microbes tailor macromolecules and metabolism to overcome specific environmental challenges. Acetic acid bacteria perform the aerobic oxidation of ethanol to acetic acid and are generally resistant to high levels of these two membrane-permeable poisons. The citric acid cycle (CAC) is linked to acetic acid resistance in Acetobacter aceti by several observations, among them the oxidation of acetate to CO2 by highly resistant acetic acid bacteria and the previously unexplained role of A. aceti citrate synthase (AarA) in acetic acid resistance at a low pH. Here we assign specific biochemical roles to the other components of the A. aceti strain 1023 aarABC region. AarC is succinyl-coenzyme A (CoA):acetate CoA-transferase, which replaces succinyl-CoA synthetase in a variant CAC. This new bypass appears to reduce metabolic demand for free CoA, reliance upon nucleotide pools, and the likely effect of variable cytoplasmic pH upon CAC flux. The putative aarB gene is reassigned to SixA, a known activator of CAC flux. Carbon overflow pathways are triggered in many bacteria during metabolic limitation, which typically leads to the production and diffusive loss of acetate. Since acetate overflow is not feasible for A. aceti, a CO(2) loss strategy that allows acetic acid removal without substrate-level (de)phosphorylation may instead be employed. All three aar genes, therefore, support flux through a complete but unorthodox CAC that is needed to lower cytoplasmic acetate levels.
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Altieri C, Speranza B, Cardillo D, Sinigaglia M. Survival of planktonic and sessile Acetobacter cerevisiae. Int J Food Sci Technol 2008. [DOI: 10.1111/j.1365-2621.2006.01476.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Control of acetic acid fermentation by quorum sensing via N-acylhomoserine lactones in Gluconacetobacter intermedius. J Bacteriol 2008; 190:2546-55. [PMID: 18245283 DOI: 10.1128/jb.01698-07] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A number of gram-negative bacteria regulate gene expression in a cell density-dependent manner by quorum sensing via N-acylhomoserine lactones (AHLs). Gluconacetobacter intermedius NCI1051, a gram-negative acetic acid bacterium, produces three different AHLs, N-decanoyl-l-homoserine lactone, N-dodecanoyl-L-homoserine lactone, and an N-dodecanoyl-L-homoserine lactone with a single unsaturated bond in its acyl chain, as determined by liquid chromatography-tandem mass spectrometry. Two genes encoding an AHL synthase and a cognate regulator were cloned from strain NCI1051 and designated ginI and ginR, respectively. Disruption of ginI or ginR abolished AHL production, indicating that NCI1051 contains a single set of quorum-sensing genes. Transcriptional analysis showed that ginI is activated by GinR, which is consistent with the finding that there is an inverted repeat whose nucleotide sequence is similar to the sequence bound by members of the LuxR family at position -45 with respect to the transcriptional start site of ginI. A single gene, designated ginA, located just downstream of ginI is transcribed by read-through from the GinR-inducible ginI promoter. A ginA mutant, as well as the ginI and ginR mutants, grew more rapidly in medium containing 2% (vol/vol) ethanol and accumulated acetic acid at a higher rate with a greater final yield than parental strain NCI1051. In addition, these mutants produced larger amounts of gluconic acid than the parental strain. These data demonstrate that the GinI/GinR quorum-sensing system in G. intermedius controls the expression of ginA, which in turn represses oxidative fermentation, including acetic acid and gluconic acid fermentation.
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Trcek J, Jernejc K, Matsushita K. The highly tolerant acetic acid bacterium Gluconacetobacter europaeus adapts to the presence of acetic acid by changes in lipid composition, morphological properties and PQQ-dependent ADH expression. Extremophiles 2007; 11:627-35. [PMID: 17487444 DOI: 10.1007/s00792-007-0077-y] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Accepted: 03/12/2007] [Indexed: 10/23/2022]
Abstract
The strain of acetic acid bacterium, Gluconacetobacter europaeus V3, previously isolated from industrial vinegar-producing bioreactor, tolerates extremely high acetic acid concentrations of up to 10% (v/v). Increased concentration of acetic acid changed the total fatty acid composition of cells by increasing the concentration of a major unsaturated fatty acid, the cis-vaccenic acid. Among the phospholipids, the most significant change was observed for phosphatidylglycerol with 7.3-fold increase and phosphatidylethanolamin with 2.7-fold decrease in the presence of 3% (v/v) of acetic acid. The sizes of cells analyzed with scanning electron microscopy changed from short to long rods in the presence of acetic acid. The cells were covered with spongy layer. The increase of acetic acid concentration from 1 to 2% (v/v) induced the expression of PQQ-dependent alcohol dehydrogenase, but the regulation could not be demonstrated at the transcriptional level. All together, our results suggest that Ga. europaeus activates several adaptive mechanisms to resist the stress of acetic acid.
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Affiliation(s)
- Janja Trcek
- Limnos, Podlimbarskega 31, 1000 Ljubljana, Slovenia.
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USCANGA MAGUILAR, ABARCA BESCUDERO, RODRIGUEZ JGOMEZ, GARCIA RCORTES. CARBON SOURCES AND THEIR EFFECT ON GROWTH, ACETIC ACID AND ETHANOL PRODUCTION BY BRETTANOMYCES BRUXELLENSIS IN BATCH CULTURE. J FOOD PROCESS ENG 2007. [DOI: 10.1111/j.1745-4530.2007.00097.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Francois JA, Starks CM, Sivanuntakorn S, Jiang H, Ransome AE, Nam JW, Constantine CZ, Kappock TJ. Structure of a NADH-insensitive hexameric citrate synthase that resists acid inactivation. Biochemistry 2007; 45:13487-99. [PMID: 17087502 DOI: 10.1021/bi061083k] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Acetobacter aceti converts ethanol to acetic acid, and strains highly resistant to both are used to make vinegar. A. aceti survives acetic acid exposure by tolerating cytoplasmic acidification, which implies an unusual adaptation of cytoplasmic components to acidic conditions. A. aceti citrate synthase (AaCS), a hexameric type II citrate synthase, is required for acetic acid resistance and, therefore, would be expected to function at low pH. Recombinant AaCS has intrinsic acid stability that may be a consequence of strong selective pressure to function at low pH, and unexpectedly high thermal stability for a protein that has evolved to function at approximately 30 degrees C. The crystal structure of AaCS, complexed with oxaloacetate (OAA) and the inhibitor carboxymethyldethia-coenzyme A (CMX), was determined to 1.85 A resolution using protein purified by a tandem affinity purification procedure. This is the first crystal structure of a "closed" type II CS, and its active site residues interact with OAA and CMX in the same manner observed in the corresponding type I chicken CS.OAA.CMX complex. While AaCS is not regulated by NADH, it retains many of the residues used by Escherichia coli CS (EcCS) for NADH binding. The surface of AaCS is abundantly decorated with basic side chains and has many fewer uncompensated acidic charges than EcCS; this constellation of charged residues is stable in varied pH environments and may be advantageous in the A. aceti cytoplasm.
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Affiliation(s)
- Julie A Francois
- Department of Chemistry, Washington University, St. Louis, Missouri 63130-4899, USA
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Trcek J, Toyama H, Czuba J, Misiewicz A, Matsushita K. Correlation between acetic acid resistance and characteristics of PQQ-dependent ADH in acetic acid bacteria. Appl Microbiol Biotechnol 2006; 70:366-73. [PMID: 16133326 DOI: 10.1007/s00253-005-0073-z] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2005] [Revised: 06/24/2005] [Accepted: 06/24/2005] [Indexed: 11/30/2022]
Abstract
In this study, we compared the growth properties and molecular characteristics of pyrroloquinoline quinone (PQQ)-dependent alcohol dehydrogenase (ADH) among highly acetic acid-resistant strains of acetic acid bacteria. Gluconacetobacter europaeus exhibited the highest resistance to acetic acid (10%), whereas Gluconacetobacter intermedius and Acetobacter pasteurianus resisted up to 6% of acetic acid. In media with different concentrations of acetic acid, the maximal acetic acid production rate of Ga. europaeus slowly increased, but specific growth rates decreased concomitant with increased concentration of acetic acid in medium. The lag phase of A. pasteurianus was twice and four times longer in comparison to the lag phases of Ga. europaeus and Ga. intermedius, respectively. PQQ-dependent ADH activity was twice as high in Ga. europaeus and Ga. intermedius as in A. pasteurinus. The purified enzymes showed almost the same specific activity to each other, but in the presence of acetic acid, the enzyme activity decreased faster in A. pasteurianus and Ga. intermedius than in Ga. europaeus. These results suggest that high ADH activity in the Ga. europaeus cells and high acetic acid stability of the purified enzyme represent two of the unique features that enable this species to grow and stay metabolically active at extremely high concentrations of acetic acid.
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Affiliation(s)
- Janja Trcek
- Limnos, Podlimbarskega 31, 1000, Ljubljana, Slovenia.
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Nakano S, Fukaya M, Horinouchi S. Putative ABC transporter responsible for acetic acid resistance in Acetobacter aceti. Appl Environ Microbiol 2006; 72:497-505. [PMID: 16391084 PMCID: PMC1352267 DOI: 10.1128/aem.72.1.497-505.2006] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two-dimensional gel electrophoretic analysis of the membrane fraction of Acetobacter aceti revealed the presence of several proteins that were produced in response to acetic acid. A 60-kDa protein, named AatA, which was mostly induced by acetic acid, was prepared; aatA was cloned on the basis of its NH2-terminal amino acid sequence. AatA, consisting of 591 amino acids and containing ATP-binding cassette (ABC) sequences and ABC signature sequences, belonged to the ABC transporter superfamily. The aatA mutation with an insertion of the neomycin resistance gene within the aatA coding region showed reduced resistance to acetic acid, formic acid, propionic acid, and lactic acid, whereas the aatA mutation exerted no effects on resistance to various drugs, growth at low pH (adjusted with HCl), assimilation of acetic acid, or resistance to citric acid. Introduction of plasmid pABC101 containing aatA under the control of the Escherichia coli lac promoter into the aatA mutant restored the defect in acetic acid resistance. In addition, pABC101 conferred acetic acid resistance on E. coli. These findings showed that AatA was a putative ABC transporter conferring acetic acid resistance on the host cell. Southern blot analysis and subsequent nucleotide sequencing predicted the presence of aatA orthologues in a variety of acetic acid bacteria belonging to the genera Acetobacter and Gluconacetobacter. The fermentation with A. aceti containing aatA on a multicopy plasmid resulted in an increase in the final yield of acetic acid.
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Affiliation(s)
- Shigeru Nakano
- Central Research Institute, Mizkan Group Co., Ltd., Handa-shi, Aichi 475-8585, Japan.
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Matsushita K, Inoue T, Adachi O, Toyama H. Acetobacter aceti possesses a proton motive force-dependent efflux system for acetic acid. J Bacteriol 2005; 187:4346-52. [PMID: 15968043 PMCID: PMC1151782 DOI: 10.1128/jb.187.13.4346-4352.2005] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Acetic acid bacteria are obligate aerobes able to oxidize ethanol, sugar alcohols, and sugars into their corresponding acids. Among them, Acetobacter and Gluconacetobacter species have very high ethanol oxidation capacity, leading to accumulation of vast amounts of acetic acid outside the cell. Since these bacteria are able to grow in media with high concentrations of acetic acid, they must possess a specific mechanism such as an efflux pump by which they can resist the toxic effects of acetic acid. In this study, the efflux pump of Acetobacter aceti IFO 3283 was examined using intact cells and membrane vesicles. The accumulation of acetic acid/acetate in intact cells was increased by the addition of a proton uncoupler and/or cyanide, suggesting the presence of an energy-dependent efflux system. To confirm this, right-side-out and inside-out membrane vesicles were prepared from A. aceti IFO 3283, and the accumulation of acetic acid/acetate in the vesicles was examined. Upon the addition of a respiratory substrate, the accumulation of acetic acid/acetate in the right-side-out vesicles was largely decreased, while its accumulation was very much increased in the inside-out vesicles. These respiration-dependent phenomena observed in both types of membrane vesicles were all sensitive to a proton uncoupler. Acetic acid/acetate uptake in the inside-out membrane vesicles was dependent not on ATP but on the proton motive force. Furthermore, uptake was shown to be rather specific for acetic acid and to be pH dependent, because higher uptake was observed at lower pH. Thus, A. aceti IFO 3283 possesses a proton motive force-dependent efflux pump for acetic acid.
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Affiliation(s)
- Kazunobu Matsushita
- Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan.
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