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Alabiso A, Frasca S, Cantelmo V, Braglia R, Scuderi F, Costa F, Congestri R, Migliore L. From kitchen to crop: The efficacy and safety of the microbial consortium treated dishwasher wastewater for the Zero Mile system. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 214:108967. [PMID: 39053313 DOI: 10.1016/j.plaphy.2024.108967] [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: 03/30/2024] [Revised: 07/11/2024] [Accepted: 07/22/2024] [Indexed: 07/27/2024]
Abstract
A microbial consortium, based on the functional integration of photosynthetic and heterotrophic microorganisms, is the core of the Zero Mile System. This system is designed for reusing and upcycling household greywaters, a still untapped water resource. The previous challenges of dishwasher wastewater bioremediation demonstrated the capability of an ad hoc consortium (including a photosynthetic cyanobacterium and three heterotrophic bacterial isolates from dishwasher wastewater) to reclaim the wastewater at small/medium scale. In this study the wastewater treatment demonstrated to be effective in nutrient recycling and upcycling at a larger scale, i.e. 4 L (in three replicates to treat the total amount of wastewater discharged by the dishwasher), by removing high percentage of N and P from the wastewater (70% nitrogen, 50% phosphorous, respectively). Again, the reclaimed wastewater successfully fertilized lettuce plants both indoor (in the Zero Mile System demonstrator) and outdoor (in open field). Plants showed a significant higher biomass productivity in fresh weight compared to control plants and comparable or better values of the pigments and quality indices (e.g., soluble solids, total phenols, total flavonoids). Furthermore, the safety of the reclaimed wastewater is demonstrated by the analysis of the metabolic/ecologically relevant functions of the microbial communities in both untreated and treated wastewater. Colonizers were mainly organic matter degraders and bacteria involved in nitrogen cycling. The human related genera are quite few and no pathogens or potential microbiological contaminants of water bodies (as E. coli), were found. Hence, the utilization of treated dishwasher wastewater does not imply biological risks to agricultural products, soil, or groundwater.
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Affiliation(s)
- Annamaria Alabiso
- PhD Program in Evolutionary Biology and Ecology, Tor Vergata University of Rome, 00133, Rome, Italy; Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy
| | - Sara Frasca
- PhD Program in Evolutionary Biology and Ecology, Tor Vergata University of Rome, 00133, Rome, Italy; Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy
| | - Valerio Cantelmo
- Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy
| | - Roberto Braglia
- Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy; eCampus University, 22060, Novedrate, (CO), Italy
| | - Francesco Scuderi
- Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy
| | - Fiammetta Costa
- Department of Design, Polytechnic of Milan, 20133, Milan, Italy
| | - Roberta Congestri
- Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy
| | - Luciana Migliore
- Department of Biology, Tor Vergata University of Rome, 00133, Rome, Italy; eCampus University, 22060, Novedrate, (CO), Italy.
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Recovery of Phosphorus in Wastewater in the Form of Polyphosphates: A Review. Processes (Basel) 2022. [DOI: 10.3390/pr10010144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
As non-renewable resource, the recovery and utilization of phosphorus from wastewater is an enduring topic. Stimulated by the advances in research on polyphosphates (polyP) as well as the development of Enhanced Biological Phosphorus Removal (EBPR) technology to achieve the efficient accumulation of polyP via polyphosphate accumulating organisms (PAOs), a novel phosphorus removal strategy is considered with promising potential for application in real wastewater treatment processes. This review mainly focuses on the mechanism of phosphorus aggregation in the form of polyP during the phosphate removal process. Further discussion about the reuse of polyP with different chain lengths is provided herein so as to suggest possible application pathways for this biosynthetic product.
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Song Y, Jiang CY, Liang ZL, Zhu HZ, Jiang Y, Yin Y, Qin YL, Huang HJ, Wang BJ, Wei ZY, Cheng RX, Liu ZP, Liu Y, Jin T, Wang AJ, Liu SJ. Candidatus Kaistella beijingensis sp. nov., Isolated from a Municipal Wastewater Treatment Plant, Is Involved in Sludge Foaming. Appl Environ Microbiol 2021; 87:e0153421. [PMID: 34586909 PMCID: PMC8612268 DOI: 10.1128/aem.01534-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 09/20/2021] [Indexed: 12/30/2022] Open
Abstract
Biological foaming (or biofoaming) is a frequently occurring problem in wastewater treatment plants (WWTPs) and is attributed to the overwhelming growth of filamentous bulking and foaming bacteria (BFB). Biological foaming has been intensively investigated, with BFB like Microthrix and Skermania having been identified from WWTPs and implicated in foaming. Nevertheless, studies are still needed to improve our understanding of the microbial diversity of WWTP biofoams and how microbial activities contribute to foaming. In this study, sludge foaming at the Qinghe WWTP of China was monitored, and sludge foams were investigated using culture-dependent and culture-independent microbiological methods. The foam microbiomes exhibited high abundances of Skermania, Mycobacterium, Flavobacteriales, and Kaistella. A previously unknown bacterium, Candidatus Kaistella beijingensis, was cultivated from foams, its genome was sequenced, and it was phenotypically characterized. Ca. K. beijingensis exhibits hydrophobic cell surfaces, produces extracellular polymeric substances (EPS), and metabolizes lipids. Ca. K. beijingensis abundances were proportional to EPS levels in foams. Several proteins encoded by the Ca. K. beijingensis genome were identified from EPS that was extracted from sludge foams. Ca. K. beijingensis populations accounted for 4 to 6% of the total bacterial populations in sludge foam samples within the Qinghe WWTP, although their abundances were higher in spring than in other seasons. Cooccurrence analysis indicated that Ca. K. beijingensis was not a core node among the WWTP community network, but its abundances were negatively correlated with those of the well-studied BFB Skermania piniformis among cross-season Qinghe WWTP communities. IMPORTANCE Biological foaming, also known as scumming, is a sludge separation problem that has become the subject of major concern for long-term stable activated sludge operation in decades. Biological foaming was considered induced by foaming bacteria. However, the occurrence and deterioration of foaming in many WWTPs are still not completely understood. Cultivation and characterization of the enriched bacteria in foaming are critical to understand their genetic, physiological, phylogenetic, and ecological traits, as well as to improve the understanding of their relationships with foaming and performance of WWTPs.
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Affiliation(s)
- Yang Song
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- CAS Key Laboratory of Environmental Biotechnology and RCEES-IMCAS-UCAS Joint Laboratory for Environmental Microbial Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- The Ecology and Environment Branch of State Center for Research and Development of Oil Shale Exploitation, PetroChina Planning and Engineering Institute, Beijing, China
| | - Cheng-Ying Jiang
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- CAS Key Laboratory of Environmental Biotechnology and RCEES-IMCAS-UCAS Joint Laboratory for Environmental Microbial Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zong-Lin Liang
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hai-Zhen Zhu
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yong Jiang
- Beijing Drainage Group Co., Ltd, Beijing, China
| | - Ye Yin
- BGI-Qingdao, Qingdao, China
| | - Ya-Ling Qin
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hao-Jie Huang
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- State Key Laboratory of Microbial Biotechnology, Shandong University, Qingdao, China
| | - Bao-Jun Wang
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Zi-Yan Wei
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Rui-Xue Cheng
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Zhi-Pei Liu
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yao Liu
- Beijing Drainage Group Co., Ltd, Beijing, China
| | | | - Ai-Jie Wang
- CAS Key Laboratory of Environmental Biotechnology and RCEES-IMCAS-UCAS Joint Laboratory for Environmental Microbial Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Shuang-Jiang Liu
- State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center at Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- State Key Laboratory of Microbial Biotechnology, Shandong University, Qingdao, China
- University of Chinese Academy of Sciences, Beijing, China
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Wu Q, Guo L, Li X, Wang Y. Effect of phosphorus concentration and light/dark condition on phosphorus uptake and distribution with microalgae. BIORESOURCE TECHNOLOGY 2021; 340:125745. [PMID: 34426241 DOI: 10.1016/j.biortech.2021.125745] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/05/2021] [Accepted: 08/07/2021] [Indexed: 06/13/2023]
Abstract
In this study, the effects of P concentration and light/dark condition on the distribution of P in microalgae were tracked with Scenedesmus sp.393. Results showed that different culture conditions affected the accumulation capacity and transformation of P in intracellular polymeric substances (IPS), extracellular polymeric substances (EPS), and soluble microbial products (SMP). At low P concentration (0.70 mg P/L), inorganic phosphorus (IP) absorbed in EPS (19.40%) and organic phosphorus (OP) accumulated in IPS (70.98%) were mainly P forms in microalgae. High P concentration (>21.42 mg P/L) promoted the luxury uptake and accumulation of IP by IPS, and the conversion of IP to OP. However, the adsorption of IP by EPS was inhibited when exposed to high external P concentration. Continuous illumination promoted the microalgae growth, and dark condition stimulated the P accumulation in microalgae biomass. The results of this study could provide valuable information for P recovery with microalgae.
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Affiliation(s)
- Qirui Wu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Liang Guo
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
| | - Xunzhou Li
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Yu Wang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
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Hinchliffe JD, Parassini Madappura A, Syed Mohamed SMD, Roy I. Biomedical Applications of Bacteria-Derived Polymers. Polymers (Basel) 2021; 13:1081. [PMID: 33805506 PMCID: PMC8036740 DOI: 10.3390/polym13071081] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 12/12/2022] Open
Abstract
Plastics have found widespread use in the fields of cosmetic, engineering, and medical sciences due to their wide-ranging mechanical and physical properties, as well as suitability in biomedical applications. However, in the light of the environmental cost of further upscaling current methods of synthesizing many plastics, work has recently focused on the manufacture of these polymers using biological methods (often bacterial fermentation), which brings with them the advantages of both low temperature synthesis and a reduced reliance on potentially toxic and non-eco-friendly compounds. This can be seen as a boon in the biomaterials industry, where there is a need for highly bespoke, biocompatible, processable polymers with unique biological properties, for the regeneration and replacement of a large number of tissue types, following disease. However, barriers still remain to the mass-production of some of these polymers, necessitating new research. This review attempts a critical analysis of the contemporary literature concerning the use of a number of bacteria-derived polymers in the context of biomedical applications, including the biosynthetic pathways and organisms involved, as well as the challenges surrounding their mass production. This review will also consider the unique properties of these bacteria-derived polymers, contributing to bioactivity, including antibacterial properties, oxygen permittivity, and properties pertaining to cell adhesion, proliferation, and differentiation. Finally, the review will select notable examples in literature to indicate future directions, should the aforementioned barriers be addressed, as well as improvements to current bacterial fermentation methods that could help to address these barriers.
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Affiliation(s)
| | | | | | - Ipsita Roy
- Department of Materials Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield S1 3JD, UK; (J.D.H.); (A.P.M.); (S.M.D.S.M.)
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6
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Using Microbial Aggregates to Entrap Aqueous Phosphorus. Trends Biotechnol 2020; 38:1292-1303. [DOI: 10.1016/j.tibtech.2020.03.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/23/2020] [Accepted: 03/24/2020] [Indexed: 02/06/2023]
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Cappelletti M, Presentato A, Piacenza E, Firrincieli A, Turner RJ, Zannoni D. Biotechnology of Rhodococcus for the production of valuable compounds. Appl Microbiol Biotechnol 2020; 104:8567-8594. [PMID: 32918579 PMCID: PMC7502451 DOI: 10.1007/s00253-020-10861-z] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/14/2020] [Accepted: 08/26/2020] [Indexed: 12/31/2022]
Abstract
Bacteria belonging to Rhodococcus genus represent ideal candidates for microbial biotechnology applications because of their metabolic versatility, ability to degrade a wide range of organic compounds, and resistance to various stress conditions, such as metal toxicity, desiccation, and high concentration of organic solvents. Rhodococcus spp. strains have also peculiar biosynthetic activities that contribute to their strong persistence in harsh and contaminated environments and provide them a competitive advantage over other microorganisms. This review is focused on the metabolic features of Rhodococcus genus and their potential use in biotechnology strategies for the production of compounds with environmental, industrial, and medical relevance such as biosurfactants, bioflocculants, carotenoids, triacylglycerols, polyhydroxyalkanoate, siderophores, antimicrobials, and metal-based nanostructures. These biosynthetic capacities can also be exploited to obtain high value-added products from low-cost substrates (industrial wastes and contaminants), offering the possibility to efficiently recover valuable resources and providing possible waste disposal solutions. Rhodococcus spp. strains have also recently been pointed out as a source of novel bioactive molecules highlighting the need to extend the knowledge on biosynthetic capacities of members of this genus and their potential utilization in the framework of bioeconomy. KEY POINTS: • Rhodococcus possesses promising biosynthetic and bioconversion capacities. • Rhodococcus bioconversion capacities can provide waste disposal solutions. • Rhodococcus bioproducts have environmental, industrial, and medical relevance. Graphical abstract.
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Affiliation(s)
- Martina Cappelletti
- Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy.
| | - Alessandro Presentato
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
| | - Elena Piacenza
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Florence, Italy
| | - Andrea Firrincieli
- Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - Raymond J Turner
- Department of Biological Sciences, Calgary University, Calgary, AB, Canada
| | - Davide Zannoni
- Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
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8
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Abstract
Bacteria are prime cell factories that can efficiently convert carbon and nitrogen sources into a large diversity of intracellular and extracellular biopolymers, such as polysaccharides, polyamides, polyesters, polyphosphates, extracellular DNA and proteinaceous components. Bacterial polymers have important roles in pathogenicity, and their varied chemical and material properties make them suitable for medical and industrial applications. The same biopolymers when produced by pathogenic bacteria function as major virulence factors, whereas when they are produced by non-pathogenic bacteria, they become food ingredients or biomaterials. Interdisciplinary research has shed light on the molecular mechanisms of bacterial polymer synthesis, identified new targets for antibacterial drugs and informed synthetic biology approaches to design and manufacture innovative materials. This Review summarizes the role of bacterial polymers in pathogenesis, their synthesis and their material properties as well as approaches to design cell factories for production of tailor-made bio-based materials suitable for high-value applications.
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Affiliation(s)
- M Fata Moradali
- Department of Oral Biology, College of Dentistry, University of Florida, Gainesville, FL, USA
| | - Bernd H A Rehm
- Centre for Cell Factories and Biopolymers, Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD, Australia.
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9
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Wei R, Wang X, Tang W, Yang Y, Gao Y, Zhong H, Yang L. Bioaccumulations and potential human health risks assessment of heavy metals in ppk-expressing transgenic rice. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:136496. [PMID: 31927296 DOI: 10.1016/j.scitotenv.2020.136496] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/29/2019] [Accepted: 01/01/2020] [Indexed: 06/10/2023]
Abstract
In order to reduce the phosphorus (P) resource consume, the polyphosphatekinase (ppk)-expressing transgenic rice (ETR) with high utilization efficiency of P fertilizer had been constructed. However, synthesis polyphosphates (polyP) mediated byppkin the plants have the ability of chelating heavy metals, so the potential hazards of the new elite rice variety have raised concerns. In the study, we planted ETR and wild-type Nipponbare (WT) in paddy fields in southern China. After harvest, the concentrations of eight heavy metals in rice tissues were measured, and health risks assessments were performed. The field experiment showed that the ppkexpressions were detected in the roots and straws of ETR plants but did not increase the concentrations of As, Cd, Cr, Ni and Pb in rice tissues. The Hg concentration in the ETRD root was 1.70-fold higher than that in WT, but the abundant Hg bioaccumulation in ETRD only occurred in the root. The bioaccumulation factors (BAFs) of all the detected heavy metals in the ETRS were no different from WT except for Cu and Zn. The results of human health risks assessment of heavy metals in brown rice showed that the non-carcinogenic risks of Cu or Zn in ETRD were higher than that in WT, while there was no difference in the total noncarcinogenic risk of the eight heavy metals in ETR. The carcinogenic risks of heavy metals in ETR were also comparable to that in WT. The results of this study indicated that the ppk expression in rice did not increase human health risks of heavy metals by consuming brown rice, which would provide a safety guarantee for agricultural and environmental applications of ETR not only with single-copy line but also with double-copy line.
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Affiliation(s)
- Ruping Wei
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Xin Wang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210023, PR China
| | - Wenli Tang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Yicheng Yang
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States
| | - Yan Gao
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Huan Zhong
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Liuyan Yang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
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Wang X, Shi C, Mo J, Xu Y, Wei W, Zhao J. An Inorganic Biopolymer Polyphosphate Controls Positively Charged Protein Phase Transitions. Angew Chem Int Ed Engl 2020; 59:2679-2683. [DOI: 10.1002/anie.201913833] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Xin Wang
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Chenke Shi
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Jianbin Mo
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
| | - Yun Xu
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Wei Wei
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
- Shenzhen Research InstituteNanjing University Shenzhen 518000 P. R. China
| | - Jing Zhao
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- Shenzhen Research InstituteNanjing University Shenzhen 518000 P. R. China
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11
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Wang X, Shi C, Mo J, Xu Y, Wei W, Zhao J. An Inorganic Biopolymer Polyphosphate Controls Positively Charged Protein Phase Transitions. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xin Wang
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Chenke Shi
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Jianbin Mo
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
| | - Yun Xu
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
| | - Wei Wei
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- State Key Laboratory of Pharmaceutical BiotechnologySchool of Life ScienceNanjing University Nanjing 210093 P. R. China
- Shenzhen Research InstituteNanjing University Shenzhen 518000 P. R. China
| | - Jing Zhao
- State Key Laboratory of Coordination ChemistryChemistry and Biomedicine Innovation Center (ChemBIC)School of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
- Shenzhen Research InstituteNanjing University Shenzhen 518000 P. R. China
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Mukherjee C, Chowdhury R, Begam MM, Ganguli S, Basak R, Chaudhuri B, Ray K. Effect of Varying Nitrate Concentrations on Denitrifying Phosphorus Uptake by DPAOs With a Molecular Insight Into Pho Regulon Gene Expression. Front Microbiol 2019; 10:2586. [PMID: 31787959 PMCID: PMC6856094 DOI: 10.3389/fmicb.2019.02586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 10/25/2019] [Indexed: 11/16/2022] Open
Abstract
Bacterial Pho regulon is a key regulator component in biological phosphorus-uptake. Poly-phosphate accumulating bacteria used in enhanced biological phosphorus removal (EBPR) system encounter negative regulation of the Pho regulon, resulting in reduced phosphorus-uptake from phosphorus-replete waste effluents. This study demonstrates possible trends of overcoming the PhoU negative regulation, resulting in excessive PO4 3--P uptake at varying concentrations of NO3 --N through denitrifying phosphorus removal process. We investigated the Pho regulon gene expression pattern and kinetic studies of P-removal by denitrifying phosphate accumulating organisms (DPAOs) which are able to remove both PO4 3--P and NO3 --N in single anoxic stage with the utilization of external carbon sources, without the use of stored polyhydroxyalkanoate (PHA) and without any anaerobic-aerobic or anaerobic-anoxic switches. Our study establishes that a minimum addition of 100 ppm NO3 --N leads to the withdrawal of the negative regulation of Pho regulon and results in ∼100% P-removal with concomitant escalated poly-phosphate accumulation by our established DPAO isolates and their artificially made consortium, isolated from sludge sample of PO4 3- -rich parboiled rice mill effluent, in a settling tank within 12 h of treatment. The same results were obtained when a phosphate rich effluent (stillage from distillery) mixed with a nitrate rich effluent (from explosive industry) was treated together in a single phase anoxic batch reactor, eliminating the need for alternating anaerobic/aerobic or anaerobic/anoxic switches for removing both the pollutants simultaneously. The highest poly-phosphate accumulation was observed to be more than 17% of cell dry weight. Our studies unequivocally establish that nitrate induction of Pho regulon is parallely associated with the repression of PhoU gene transcription, which is the negative regulator of Pho regulon. Based on earlier observations where similar nitrate mediated transcriptional repression was cited, we hypothesize the possible involvement of NarL/NarP transcriptional regulator proteins in PhoU repression. At present, we propose this denitrifying phosphorus removal endeavor as an innovative methodology to overcome the negative regulation of Pho regulon for accelerated unhindered phosphorus remediation from phosphate rich wastewater in India and the developing world where the stringency of EBPR and other reactors prevent their use due to financial reasons.
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Affiliation(s)
- Chandan Mukherjee
- Environmental Biotechnology Group, Department of Botany, West Bengal State University, Kolkata, India
| | - Rajojit Chowdhury
- Environmental Biotechnology Group, Department of Botany, West Bengal State University, Kolkata, India
| | - Mst. Momtaj Begam
- Environmental Biotechnology Group, Department of Botany, West Bengal State University, Kolkata, India
| | - Sayak Ganguli
- Theoretical and Computational Biology Division, AIIST and The Biome, Kolkata, India
| | - Ritabrata Basak
- Department of Biochemistry, Ballygunge Science College, University of Calcutta, Kolkata, India
| | | | - Krishna Ray
- Environmental Biotechnology Group, Department of Botany, West Bengal State University, Kolkata, India
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13
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A Stringent Analysis of Polyphosphate Dynamics in Escherichia coli. J Bacteriol 2019; 201:JB.00070-19. [PMID: 30782636 DOI: 10.1128/jb.00070-19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
During stress, bacterial cells activate a conserved pathway called the stringent response that promotes survival. Polyphosphates are long chains of inorganic phosphates that modulate this response in diverse bacterial species. In this issue, Michael J. Gray provides an important correction to the model of how polyphosphate accumulation is regulated during the stringent response in Escherichia coli (M. J. Gray, J. Bacteriol, 201:e00664-18, 2019, https://doi.org/10.1128/JB.00664-18). With other recent publications, this study provides a revised framework for understanding how bacterial polyphosphate dynamics might be exploited in infection control and industrial applications.
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Rudat AK, Pokhrel A, Green TJ, Gray MJ. Mutations in Escherichia coli Polyphosphate Kinase That Lead to Dramatically Increased In Vivo Polyphosphate Levels. J Bacteriol 2018; 200:e00697-17. [PMID: 29311274 PMCID: PMC5826030 DOI: 10.1128/jb.00697-17] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 12/20/2017] [Indexed: 11/20/2022] Open
Abstract
Bacteria synthesize inorganic polyphosphate (polyP) in response to a wide variety of stresses, and production of polyP is essential for stress response and survival in many important pathogens and bacteria used in biotechnological processes. However, surprisingly little is known about the molecular mechanisms that control polyP synthesis. We have therefore developed a novel genetic screen that specifically links growth of Escherichia coli to polyP synthesis, allowing us to isolate mutations leading to enhanced polyP production. Using this system, we have identified mutations in the polyP-synthesizing enzyme polyP kinase (PPK) that lead to dramatic increases in in vivo polyP synthesis but do not substantially affect the rate of polyP synthesis by PPK in vitro These mutations are distant from the PPK active site and found in interfaces between monomers of the PPK tetramer. We have also shown that high levels of polyP lead to intracellular magnesium starvation. Our results provide new insights into the control of bacterial polyP accumulation and suggest a simple, novel strategy for engineering bacteria with increased polyP contents.IMPORTANCE PolyP is an ancient, universally conserved biomolecule and is important for stress response, energy metabolism, and virulence in a remarkably broad range of microorganisms. PolyP accumulation by bacteria is also important in biotechnology applications. For example, it is critical to enhanced biological phosphate removal (EBPR) from wastewater. Understanding how bacteria control polyP synthesis is therefore of broad importance in both the fields of bacterial pathogenesis and biological engineering. Using Escherichia coli as a model organism, we have identified the first known mutations in polyP kinase that lead to increases in cellular polyP content.
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Affiliation(s)
- Amanda K Rudat
- Department of Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Arya Pokhrel
- Department of Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Todd J Green
- Department of Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Michael J Gray
- Department of Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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