1
|
Muñoz-Páez KM, Buitrón G, Vital-Jácome M. Predicting metabolic pathways and microbial interactions in dark fermentation systems treating real cheese whey effluents. BIORESOURCE TECHNOLOGY 2024; 413:131536. [PMID: 39326535 DOI: 10.1016/j.biortech.2024.131536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 07/03/2024] [Accepted: 09/23/2024] [Indexed: 09/28/2024]
Abstract
Dark fermentation of agro-industrial effluents is a promising way for waste valorization. However, understanding the complex microbial dynamics and metabolic interactions within the microbial communities remains challenging. This study investigates the microbial communities involved in continuous hydrogen production from cheese whey and fermented cheese whey using functional profiling with PICRUSt2. The analysis reveals the primary roles of key microbial genera. Lactobacillus dominates carbohydrate consumption and lactate production, while Clostridium sensu stricto 12 and Caproiciproducens are engaged in a competitive dynamic for lactate utilization. Clostridium sensu stricto 12 drives hydrogen production via electron bifurcation reactions, whereas Caproiciproducens may utilize alternative energy conservation mechanisms. The interaction between these genera is influenced by substrate availability and process conditions. This study highlights the utility of functional profiling in elucidating microbial interactions and metabolic pathways in dark fermentation. The findings emphasize the importance of understanding microbial interactions to optimize biohydrogen production processes.
Collapse
Affiliation(s)
- Karla M Muñoz-Páez
- CONAHCYT - Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, México.
| | - Germán Buitrón
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México.
| | - Miguel Vital-Jácome
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México.
| |
Collapse
|
2
|
Ruhl IA, Nelson RS, Katahira R, Kruger JS, Chen X, Haugen SJ, Ingraham MA, Woodworth SP, Alt H, Ramirez KJ, Peterson DJ, Ding L, Laible PD, Linger JG, Salvachúa D. Feedstock variability impacts the bioconversion of sugar and lignin streams derived from corn stover by Clostridium tyrobutyricum and engineered Pseudomonas putida. Microb Biotechnol 2024; 17:e70006. [PMID: 39235453 PMCID: PMC11376215 DOI: 10.1111/1751-7915.70006] [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: 06/11/2024] [Accepted: 08/15/2024] [Indexed: 09/06/2024] Open
Abstract
Feedstock variability represents a challenge in lignocellulosic biorefineries, as it can influence both lignocellulose deconstruction and microbial conversion processes for biofuels and biochemicals production. The impact of feedstock variability on microbial performance remains underexplored, and predictive tools for microbial behaviour are needed to mitigate risks in biorefinery scale-up. Here, twelve batches of corn stover were deconstructed via deacetylation, mechanical refining, and enzymatic hydrolysis to generate lignin-rich and sugar streams. These batches and their derived streams were characterised to identify their chemical components, and the streams were used as substrates for producing muconate and butyrate by engineered Pseudomonas putida and wildtype Clostridium tyrobutyricum, respectively. Bacterial performance (growth, product titers, yields, and productivities) differed among the batches, but no strong correlations were identified between feedstock composition and performance. To provide metabolic insights into the origin of these differences, we evaluated the effect of twenty-three isolated chemical components on these microbes, including three components in relevant bioprocess settings in bioreactors, and we found that growth-inhibitory concentrations were outside the ranges observed in the streams. Overall, this study generates a foundational dataset on P. putida and C. tyrobutyricum performance to enable future predictive models and underscores their resilience in effectively converting fluctuating lignocellulose-derived streams into bioproducts.
Collapse
Affiliation(s)
- Ilona A Ruhl
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Robert S Nelson
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Rui Katahira
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Jacob S Kruger
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Xiaowen Chen
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Stefan J Haugen
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Morgan A Ingraham
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Sean P Woodworth
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Hannah Alt
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Kelsey J Ramirez
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Darren J Peterson
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Ling Ding
- Energy and Environmental Science and Technology, Idaho National Laboratory, Idaho Falls, Idaho, USA
| | - Philip D Laible
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, USA
| | - Jeffrey G Linger
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| | - Davinia Salvachúa
- Bioenergy Sciences and Technology Directorate, National Renewable Energy Laboratory, Golden, Colorado, USA
| |
Collapse
|
3
|
Yu Y, Xu F, Zhao W, Thoma C, Che S, Richman JE, Jin B, Zhu Y, Xing Y, Wackett L, Men Y. Electron bifurcation and fluoride efflux systems implicated in defluorination of perfluorinated unsaturated carboxylic acids by Acetobacterium spp. SCIENCE ADVANCES 2024; 10:eado2957. [PMID: 39018407 PMCID: PMC466959 DOI: 10.1126/sciadv.ado2957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 06/12/2024] [Indexed: 07/19/2024]
Abstract
Enzymatic cleavage of C─F bonds in per- and polyfluoroalkyl substances (PFAS) is largely unknown but avidly sought to promote systems biology for PFAS bioremediation. Here, we report the reductive defluorination of α, β-unsaturated per- and polyfluorocarboxylic acids by Acetobacterium spp. The microbial defluorination products were structurally confirmed and showed regiospecificity and stereospecificity, consistent with their formation by enzymatic reactions. A comparison of defluorination activities among several Acetobacterium species indicated that a functional fluoride exporter was required for the detoxification of the released fluoride. Results from both in vivo inhibition tests and in silico enzyme modeling suggested the involvement of enzymes of the flavin-based electron-bifurcating caffeate reduction pathway [caffeoyl-CoA reductase (CarABCDE)] in the reductive defluorination. This is a report on specific microorganisms carrying out enzymatic reductive defluorination of PFAS, which could be linked to electron-bifurcating reductases that are environmentally widespread.
Collapse
Affiliation(s)
- Yaochun Yu
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Fengjun Xu
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Weiyang Zhao
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Calvin Thoma
- Department of Biochemistry, Molecular Biology and Biophysics and Biotechnology Institute, University of Minnesota, Twin Cities, MN 55108, USA
| | - Shun Che
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Jack E. Richman
- Department of Biochemistry, Molecular Biology and Biophysics and Biotechnology Institute, University of Minnesota, Twin Cities, MN 55108, USA
| | - Bosen Jin
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Yiwen Zhu
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Yue Xing
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Lawrence Wackett
- Department of Biochemistry, Molecular Biology and Biophysics and Biotechnology Institute, University of Minnesota, Twin Cities, MN 55108, USA
| | - Yujie Men
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
| |
Collapse
|
4
|
Martínez-Fraile C, Muñoz R, Teresa Simorte M, Sanz I, García-Depraect O. Biohydrogen production by lactate-driven dark fermentation of real organic wastes derived from solid waste treatment plants. BIORESOURCE TECHNOLOGY 2024; 403:130846. [PMID: 38754561 DOI: 10.1016/j.biortech.2024.130846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 05/18/2024]
Abstract
This study evaluated the hydrogen production potential through lactate-driven dark fermentation (LD-DF) of organic wastes from solid waste treatment plants, including the organic fraction of municipal solid waste (OFMSW), mixed sewage sludge, and two OFMSW leachates. In initial batch fermentations, only OFMSW supported a significant hydrogen yield (70.1 ± 7.7 NmL-H2/g-VS added) among the tested feedstocks. Lactate acted as an important hydrogen precursor, requiring the presence of carbohydrates for sequential two-step lactate-type fermentation. The impact of operational pH (5.5-6.5) and initial total solids (TS) concentration (5-12.5 % w/w) was also evaluated using OFMSW as substrate, obtaining hydrogen yields ranging from 6.6 to 55.9 NmL-H2/g-VSadded. The highest yield occurred at 6.5 pH and 7.5 % TS. The LD-DF pathway was indicated to be present under diverse pH and TS conditions, supported by employing a specialized microbial consortium capable of performing LD-DF, along with the observed changes in lactate levels during fermentation.
Collapse
Affiliation(s)
- Cristina Martínez-Fraile
- Institute of Sustainable Processes, Dr. Mergelina s/n, 47011 Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain
| | - Raúl Muñoz
- Institute of Sustainable Processes, Dr. Mergelina s/n, 47011 Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain
| | - María Teresa Simorte
- FCC Medio Ambiente, Avenida Camino de Santiago 40, CTR de Valladolid, Madrid 2850, Spain
| | - Inmaculada Sanz
- FCC Medio Ambiente, Avenida Camino de Santiago 40, CTR de Valladolid, Madrid 2850, Spain
| | - Octavio García-Depraect
- Institute of Sustainable Processes, Dr. Mergelina s/n, 47011 Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
| |
Collapse
|
5
|
Yu Y, Xu F, Zhao W, Thoma C, Che S, Richman JE, Jin B, Zhu Y, Xing Y, Wackett L, Men Y. Electron-bifurcation and fluoride efflux systems in Acetobacterium spp. drive defluorination of perfluorinated unsaturated carboxylic acids. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.12.13.568471. [PMID: 38168399 PMCID: PMC10760045 DOI: 10.1101/2023.12.13.568471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Enzymatic cleavage of C-F bonds in per- and polyfluoroalkyl substances (PFAS) is largely unknown but avidly sought to promote systems biology for PFAS bioremediation. Here, we report the reductive defluorination of α, β-unsaturated per- and polyfluorocarboxylic acids by Acetobacterium spp. Two critical molecular features in Acetobacterium species enabling reductive defluorination are (i) a functional fluoride efflux transporter (CrcB) and (ii) an electron-bifurcating caffeate reduction pathway (CarABCDE). The fluoride transporter was required for detoxification of released fluoride. Car enzymes were implicated in defluorination by the following evidence: (i) only Acetobacterium spp. with car genes catalyzed defluorination; (ii) caffeate and PFAS competed in vivo ; (iii) models from the X-ray structure of the electron-bifurcating reductase (CarC) positioned the PFAS substrate optimally for reductive defluorination; (iv) products identified by 19 F-NMR and high-resolution mass spectrometry were consistent with the model. Defluorination biomarkers identified here were found in wastewater treatment plant metagenomes on six continents.
Collapse
|