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Li Y, Liu B, Tu Q, Xue S, Liu X, Wu Z, An S, Chen J, Wang Z. The ecological roles of assembling genomes for Bacillales and Clostridiales in coal seams. FEMS Microbiol Lett 2022; 369:6605329. [PMID: 35687414 DOI: 10.1093/femsle/fnac053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 03/11/2022] [Accepted: 06/08/2022] [Indexed: 11/13/2022] Open
Abstract
Biogenic coalbed methane is produced by biological processes mediated by synergistic interactions of microbial complexes in coal seams. However, the ecological role of functional bacteria in biogenic coalbed methane remains poorly understood. Here, we studied the metagenome assembled genomes (MAGs) of Bacillales and Clostridiales from coal seams, revealing further expansion of hydrogen and acetogen producers involved in organic matter decomposition. In this study, Bacillales and Clostridiales were dominant orders (91.85 ± 0.94%) in cultured coal seams, and a total of 16 MAGs from 6 families, including Bacillus, Paenibacillus, Staphylococcus, Anaerosalibacter, Hungatella and Paeniclostridium, were reconstructed. These microbial groups possessed multiple metabolic pathways (glycolysis/gluconeogenesis, pentose phosphate, β-oxidation, TCA cycle, assimilatory sulfate reduction, nitrogen metabolism and encoding hydrogenase) that provided metabolic substrates (acetate and/or H2) for the methanogenic processes. Therein, the hydrogenase-encoding gene and hydrogenase maturation factors were merely found in all the Clostridiales MAGs. β-oxidation was the main metabolic pathway involved in short-chain fatty acid degradation and acetate production, and most of these pathways were detected and exhibited different operon structures in Bacillales MAGs. In addition, assimilatory sulfate reduction and nitrogen metabolism processes were also detected in some MAGs, and these processes were also closely related to acetate production and/or organic matter degradation according to their operon structures and metabolic pathways. In summary, this study enabled a better understanding of the ecological roles of Bacillales and Clostridiales in biogenic methane in coal seams based on a combination of bioinformatic techniques.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science & Technology, Huainan, Anhui province, China
| | - Bingjun Liu
- Institute of Energy, Hefei Comprehensive National Science Center, Anhui, Hefei, 230031, China
| | - Qingyi Tu
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science & Technology, Huainan, Anhui province, China
| | - Sheng Xue
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science & Technology, Huainan, Anhui province, China
| | - Xiaozhou Liu
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science & Technology, Huainan, Anhui province, China
| | - Zhijian Wu
- Coal Mining National Engineering and Technology Research Institute, Huainan, Anhui Province, China
| | - Shikai An
- Coal Mining National Engineering and Technology Research Institute, Huainan, Anhui Province, China
| | - Jian Chen
- Coal Mining National Engineering and Technology Research Institute, Huainan, Anhui Province, China
| | - Zhigen Wang
- China National Coal Xinji Group Corporation, Huainan, Anhui Province, China
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Salakkam A, Sittijunda S, Mamimin C, Phanduang O, Reungsang A. Valorization of microalgal biomass for biohydrogen generation: A review. BIORESOURCE TECHNOLOGY 2021; 322:124533. [PMID: 33348113 DOI: 10.1016/j.biortech.2020.124533] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 12/05/2020] [Accepted: 12/08/2020] [Indexed: 05/16/2023]
Abstract
Third generation biomass, i.e. microalgae, has emerged as a promising alternative to first and second generation biomass for biohydrogen production. However, its utilization is still low at present, due to several reasons including the strong and rigidity of the microalgal cell wall that limit the hydrolysis efficiency during dark fermentation (DF) and photofermentation (PF) processes. To improve the utilization efficiency of microalgal biomass, it is crucial that important aspects related to the production of the biomass and the following processes are elaborated. Thus, this article provides detailed overview of algal strains, cultivation, and harvesting. It also presents recent research and detailed information on microalgal biomass pretreatment, and biohydrogen production through DF, PF, and co-digestion of microalgal biomass with organic materials. Furthermore, factors affecting fermentation processes performance and the use of molecular techniques in biohydrogen production are presented. This review also discusses challenges and future prospects towards biohydrogen production from microalgal biomass.
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Affiliation(s)
- Apilak Salakkam
- Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Sureewan Sittijunda
- Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Chonticha Mamimin
- Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Orawan Phanduang
- Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Alissara Reungsang
- Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand; Research Group for Development of Microbial Hydrogen Production Process from Biomass, Khon Kaen University, Khon Kaen 40002, Thailand; Academy of Science, Royal Society of Thailand, Bangkok 10300, Thailand.
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Sangavai C, Chellapandi P. Growth-associated catabolic potential of Acetoanaerobium sticklandii DSM 519 on gelatin and amino acids. J Basic Microbiol 2020; 60:882-893. [PMID: 32812241 DOI: 10.1002/jobm.202000292] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/31/2020] [Accepted: 08/09/2020] [Indexed: 11/07/2022]
Abstract
Acetoanaerobium sticklandii DSM 519 is a hyperammonia-producing anaerobe that catabolizes proteins and amino acids into organic solvents and volatile acids via the Stickland reactions. However, the specific growth rate and metabolic capability of this organism on proteins and amino acids are not yet known. Therefore, the present study was intended to evaluate its specific growth rate and metabolic potential on gelatin and amino acids in the experimental media. We carried out metabolic assay experiments to calculate its ability to utilize pure gelatin, single amino acids, and amino acid pairs at different growth phases. The results of this study show that complete assimilation of gelatin was achieved by its log-phase culture. The subsequent fermentation of amino acids was much faster than gelatin hydrolysis. The rate of gelatin degradation was associated with the growth and catabolic rates of this organism. Many amino acids were not assimilated completely for its growth and energy conservation. A log-phase culture of this organism preferably utilized l-cysteine, l-arginine, and l-serine, and released more fraction of ammonia. As shown by our analysis, the catabolic rates of these amino acids were determined by the rates of respective enzymes involved in amino acid catabolic pathways and feedback repression of ammonia. The growth kinetic data indicated that at the initial growth stage, a metabolic shift in its solventogenesis and acidogenesis phases was associated with catabolism of certain amino acids. Thus, the results of this study provide a new insight to exploit its log-phase culture as a starter for the production of biofuel components from gelatin processing industries.
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Affiliation(s)
- Chinnadurai Sangavai
- Molecular Systems Engineering Lab, Department of Bioinformatics, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Paulchamy Chellapandi
- Molecular Systems Engineering Lab, Department of Bioinformatics, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
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