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Wang Y, Li J, Liu M, Gu L, Xu L, Li J, Ao L. Enhancement of anaerobic digestion of high salinity food waste by magnetite and potassium ions: Digestor performance, microbial and metabolomic analyses. BIORESOURCE TECHNOLOGY 2023; 388:129769. [PMID: 37722541 DOI: 10.1016/j.biortech.2023.129769] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/29/2023] [Accepted: 09/11/2023] [Indexed: 09/20/2023]
Abstract
The study investigated the effectiveness of magnetite and potassium ions (K+) in enhancing anaerobic digestion of high salinity food waste. Results indicated that both magnetite and K+ improved anaerobic digestion in high-salt environments, and their combination yielded even better results. The combination of magnetite and K+ promoted microorganism activity, and resulted in increased abundance of DMER64, Halobacteria and Methanosaeta. Metabolomic analysis revealed that magnetite mainly influenced quorum sensing, while K+ mainly stimulated the synthesis of compatible solutes, aiding in maintaining osmotic balance. The combined additives regulated pathways such as ATP binding cassette transport, methane metabolism, and inhibitory substance metabolism, enabling cells to resist environmental stress and maintain normal metabolic activity. Overall, this study demonstrated the potential of magnetite and K+ to enhance food waste anaerobic digestion in high salt conditions and provided valuable insights into the molecular mechanism.
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Affiliation(s)
- Yi Wang
- Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, 400045, PR China
| | - Jianhao Li
- Yangtze River Delta (jiaxing) Ecological Development Co.,LTD, 32 Qinyi Road, 314050, Zhejiang, PR China
| | - Miao Liu
- Gastrointestinal Cancer Center, Chongqing University Cancer Hospital, 174 Shapingba Road, 400045, PR China
| | - Li Gu
- Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, 400045, PR China.
| | - Linji Xu
- Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, 400045, PR China
| | - Jinze Li
- Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, 400045, PR China
| | - Lianggen Ao
- Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, 400045, PR China
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Koester I, Quinlan ZA, Nothias LF, White ME, Rabines A, Petras D, Brunson JK, Dührkop K, Ludwig M, Böcker S, Azam F, Allen AE, Dorrestein PC, Aluwihare LI. Illuminating the dark metabolome of Pseudo-nitzschia-microbiome associations. Environ Microbiol 2022; 24:5408-5424. [PMID: 36222155 PMCID: PMC9707391 DOI: 10.1111/1462-2920.16242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 10/09/2022] [Indexed: 11/28/2022]
Abstract
The exchange of metabolites mediates algal and bacterial interactions that maintain ecosystem function. Yet, while thousands of metabolites are produced, only a few molecules have been identified in these associations. Using the ubiquitous microalgae Pseudo-nitzschia sp., as a model, we employed an untargeted metabolomics strategy to assign structural characteristics to the metabolites that distinguished specific diatom-microbiome associations. We cultured five species of Pseudo-nitzschia, including two species that produced the toxin domoic acid, and examined their microbiomes and metabolomes. A total of 4826 molecular features were detected by tandem mass spectrometry. Only 229 of these could be annotated using available mass spectral libraries, but by applying new in silico annotation tools, characterization was expanded to 2710 features. The metabolomes of the Pseudo-nitzschia-microbiome associations were distinct and distinguished by structurally diverse nitrogen compounds, ranging from simple amines and amides to cyclic compounds such as imidazoles, pyrrolidines and lactams. By illuminating the dark metabolomes, this study expands our capacity to discover new chemical targets that facilitate microbial partnerships and uncovers the chemical diversity that underpins algae-bacteria interactions.
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Affiliation(s)
- Irina Koester
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
| | - Zachary A. Quinlan
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
| | - Louis-Félix Nothias
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
| | - Margot E. White
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
| | - Ariel Rabines
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
- Microbial and Environmental Genomics Group, J. Craig Venter Institute, La Jolla, CA 92037, USA
| | - Daniel Petras
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
| | - John K. Brunson
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
- Microbial and Environmental Genomics Group, J. Craig Venter Institute, La Jolla, CA 92037, USA
| | - Kai Dührkop
- Chair for Bioinformatics, Friedrich Schiller University, Jena, Germany
| | - Marcus Ludwig
- Chair for Bioinformatics, Friedrich Schiller University, Jena, Germany
| | - Sebastian Böcker
- Chair for Bioinformatics, Friedrich Schiller University, Jena, Germany
| | - Farooq Azam
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
| | - Andrew E. Allen
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
- Microbial and Environmental Genomics Group, J. Craig Venter Institute, La Jolla, CA 92037, USA
| | - Pieter C. Dorrestein
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, USA
| | - Lihini I. Aluwihare
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
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Marine dissolved organic matter: a vast and unexplored molecular space. Appl Microbiol Biotechnol 2021; 105:7225-7239. [PMID: 34536106 PMCID: PMC8494709 DOI: 10.1007/s00253-021-11489-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 07/29/2021] [Accepted: 07/31/2021] [Indexed: 01/02/2023]
Abstract
Abstract Marine dissolved organic matter (DOM) comprises a vast and unexplored molecular space. Most of it resided in the oceans for thousands of years. It is among the most diverse molecular mixtures known, consisting of millions of individual compounds. More than 1 Eg of this material exists on the planet. As such, it comprises a formidable source of natural products promising significant potential for new biotechnological purposes. Great emphasis has been placed on understanding the role of DOM in biogeochemical cycles and climate attenuation, its lifespan, interaction with microorganisms, as well as its molecular composition. Yet, probing DOM bioactivities is in its infancy, largely because it is technically challenging due to the chemical complexity of the material. It is of considerable interest to develop technologies capable to better discern DOM bioactivities. Modern screening technologies are opening new avenues allowing accelerated identification of bioactivities for small molecules from natural products. These methods diminish a priori the need for laborious chemical fractionation. We examine here the application of untargeted metabolomics and multiplexed high-throughput molecular-phenotypic screening techniques that are providing first insights on previously undetectable DOM bioactivities. Key points • Marine DOM is a vast, unexplored biotechnological resource. • Untargeted bioscreening approaches are emerging for natural product screening. • Perspectives for developing bioscreening platforms for marine DOM are discussed.
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