1
|
Mitrović I, Grahovac J, Hrustić J, Jokić A, Dodić J, Mihajlović M, Grahovac M. Utilization of waste glycerol for the production of biocontrol agents nigericin and niphimycin by Streptomyces hygroscopicus: bioprocess development. ENVIRONMENTAL TECHNOLOGY 2022; 43:3000-3013. [PMID: 33820481 DOI: 10.1080/09593330.2021.1913241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
Search for more environment-friendly methods for controlling plant diseases that would contribute to the goal of sustainability in agriculture is in focus. In the present study, the potential of Streptomyces hygroscopicus isolated from soil sample in the production of biocontrol agents, nigericin and niphimycin, effective against Alternaria alternata storage apple pathogen was examined. Also, modelling and optimization of medium composition for biocontrol agent biosynthesis was performed. The results showed that the optimum amount of C3H8O3, (NH4)2SO4 and K2HPO4 in the medium for Streptomyces hygroscopicus biosynthesis is 20, 0.25 and 1.46 g/L, respectively. Scale-up and validation of the obtained results performed in the 3 L laboratory-scale bioreactor showed that on the optimized medium at an aeration rate of 0.7 vvm and an agitation speed of 200 rpm, produced nigericin and niphimycin, showed high activity. Under the same conditions, cultivation of S. hygroscopicus was performed in a 7 L laboratory bioreactor in a medium with waste glycerol instead of pure glycerol. Results showed that the methanol extract of S. hygroscopicus cultivation liquid, containing nigericin and niphimycin, was high effective against two Alternaria isolates. This was confirmed in vitro by obtaining large inhibition zone diameters on A. alternata KA10 (47 mm) and T1Jg3 (44.33 mm) isolates. After successful in vitro analysis, in planta testing was performed. It was found that necrosis diameters that were measured on artificially inoculated apple fruits with A. alternata compared to necrosis diameter measured on untreated, control fruits, were 4.47 and 3.56 times smaller.
Collapse
Affiliation(s)
- Ivana Mitrović
- Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad, Serbia
| | - Jovana Grahovac
- Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad, Serbia
| | - Jovana Hrustić
- Institute of Pesticides and Environmental Protection, Beograd-Zemun, Serbia
| | - Aleksandar Jokić
- Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad, Serbia
| | - Jelena Dodić
- Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad, Serbia
| | - Milica Mihajlović
- Institute of Pesticides and Environmental Protection, Beograd-Zemun, Serbia
| | - Mila Grahovac
- Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
| |
Collapse
|
2
|
Berthomieu R, Pérez-Bernal MF, Santa-Catalina G, Desmond-Le Quéméner E, Bernet N, Trably E. Mechanisms underlying Clostridium pasteurianum's metabolic shift when grown with Geobacter sulfurreducens. Appl Microbiol Biotechnol 2021; 106:865-876. [PMID: 34939136 DOI: 10.1007/s00253-021-11736-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 12/08/2021] [Accepted: 12/11/2021] [Indexed: 10/19/2022]
Abstract
Recently, a study showed that glycerol fermentation by Clostridium pasteurianum could be metabolically redirected when the electroactive bacterium Geobacter sulfurreducens was added in the culture. It was assumed that this metabolic shift of the fermentative species resulted from an interspecies electron transfer. The aim of this study was to find out the mechanisms used for this interaction and how they affect the metabolism of C. pasteurianum. To get insights into the mechanisms involved, several coculture setups and RNA sequencing with differential expression analysis were performed. As a result, a putative interaction model was proposed: G. sulfurreducens produces cobamide molecules that possibly modify C. pasteurianum metabolic pathway at the key enzyme glycerol dehydratase, and affect its vanadium nitrogenase expression. In addition, the results suggested that G. sulfurreducens' electrons could enter C. pasteurianum through its transmembrane flavin-bound polyferredoxin and cellular cytochrome b5-rubredoxin interplay, putatively reinforcing the metabolic shift. Unravelling the mechanisms behind the interaction between fermentative and electroactive bacteria helps to better understand the role of bacterial interactions in fermentation setups. KEY POINTS: • C. pasteurianum-G. sulfurreducens interaction inducing a metabolic shift is mediated • C. pasteurianum's metabolic shift in coculture might be induced by cobamides • Electrons possibly enter C. pasteurianum through a multiflavin polyferredoxin.
Collapse
Affiliation(s)
| | | | | | | | | | - Eric Trably
- INRAE, Univ Montpellier, LBE, Narbonne, France.
| |
Collapse
|
3
|
Vasconcelos EAF, Santaella ST, Viana MB, Dos Santos AB, Pinheiro GC, Leitão RC. Composition and ecology of bacterial and archaeal communities in anaerobic reactor fed with residual glycerol. Anaerobe 2019; 59:145-153. [PMID: 31254652 DOI: 10.1016/j.anaerobe.2019.06.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 05/31/2019] [Accepted: 06/26/2019] [Indexed: 11/28/2022]
Abstract
Glycerol, the main residue of biodiesel production, can be used to produce organic acids and energy through anaerobic digestion. This study aimed to assess microbial structure, diversity, productivity, and stability and the influence of these parameters on the performance of an anaerobic reactor. The experimental setup consisted of an upflow anaerobic sludge blanket (UASB) reactor fed residual glycerol and nutrients. The organic loading rate (OLR) was gradually increased through five stages, and sludge samples were collected at each, followed by DNA extraction and PCR denaturing gradient gel electrophoresis (PCR-DGGE). The resulting bands were excised, amplified, and purified. The results showed increased bacterial diversity and richness from the inoculum (Rr 38.72 and H 2.32) and along stages I and II, reaching the highest populational parameters (Rr 194.06 and H 3.32). The following stages promote decreases in richness and diversity, achieving the lowest populational parameters on this study (Rr 11.53 and H 2.04). Biogas production increased along with functional organization due to the specialization of the bacterial community and a decrease in the methanogenic population, both promoted by the increase in OLR.
Collapse
Affiliation(s)
- E A F Vasconcelos
- Ecology and Natural Resources, Department of Biology, Federal University of Ceará, Campus Pici, Block 902, 60455-970, Fortaleza, CE, Brazil
| | - S T Santaella
- Institute of Marine Science, Federal University of Ceará, Av Abolição, 3207, 60165-081, Fortaleza, CE, Brazil
| | - M B Viana
- Institute of Marine Science, Federal University of Ceará, Av Abolição, 3207, 60165-081, Fortaleza, CE, Brazil
| | - A B Dos Santos
- Department of Hydraulics and Environmental Engineering, Federal University of Ceará, Campus Pici, Block 713, 60.451-970, Fortaleza, CE, Brazil
| | - G C Pinheiro
- Department of Technology and Environmental Management, Federal Institute of Education, Science and Technology of Ceará, Campus Maracanaú, Avenida Parque Central, Distrito Industrial I, Maracanaú, 61939-140, Brazil
| | - R C Leitão
- Embrapa Agroindústria Tropical, Rua Dra, Sara Mesquita, 2270, 60511-110, Fortaleza, CE, Brazil.
| |
Collapse
|
4
|
Wang XL, Zhou JJ, Sun YQ, Xiu ZL. Bioconversion of Raw Glycerol From Waste Cooking-Oil-Based Biodiesel Production to 1,3-Propanediol and Lactate by a Microbial Consortium. Front Bioeng Biotechnol 2019; 7:14. [PMID: 30834245 PMCID: PMC6387908 DOI: 10.3389/fbioe.2019.00014] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 01/18/2019] [Indexed: 01/04/2023] Open
Abstract
Waste cooking oil (WCO) is a sustainable alternative to raw vegetable oils and fats for biodiesel production considering both environmental and economic benefits. Raw glycerol from WCO-based biodiesel production (GWCO) is difficult to utilize via biological method, as multiple toxic impurities have inhibitory effects on microbial growth especially for pure cultures. In this work, four microbial consortia were selected from activated sludge by 30 serial transfers under different conditions. The obtained consortia exhibited lower diversity and species difference with the transfers. The consortium LS30 exhibited unique advantages for bioconversion of GWCO to 1,3-propanediol (1,3-PDO) and lactate (LA). Moreover, the fermentation could be performed economically under microaerobic and non-sterile conditions. The consortium consisted of 57.97% Enterobacter and 39.25% Escherichia could effectively convert 60 g/L GWCO to 1,3-PDO and LA in batch fermentation. In addition, this consortium exhibited better tolerance to fatty acid-derived crude glycerol (100 g/L), which demonstrated that specific toxic impurities in GWCO did pose a great challenge to microbial growth and metabolism. In fed batch fermentation, 27.77 g/L 1,3-PDO and 14.68 g/L LA were achieved. Compared with the consortium, a long lag phase in cell growth associated with a decreased glycerol consumption was observed in four single-strain fermentations. Furthermore, neither the consortium DL38 with excellent glycerol tolerance nor consortium C2-2M with high yield of 1,3-PDO could effectively transform GWCO into valuable products. The results demonstrated that the selected microbial consortium has the advanced adaptability to the toxic impurities in GWCO compared with other reported consortia and isolated single strain. This process can contribute to added-value use of GWCO.
Collapse
Affiliation(s)
| | | | | | - Zhi-Long Xiu
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| |
Collapse
|
5
|
Yang Y, Nie X, Jiang Y, Yang C, Gu Y, Jiang W. Metabolic regulation in solventogenic clostridia: regulators, mechanisms and engineering. Biotechnol Adv 2018; 36:905-914. [DOI: 10.1016/j.biotechadv.2018.02.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 01/05/2018] [Accepted: 02/20/2018] [Indexed: 12/31/2022]
|