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Leathers TD, Saunders LP, Bowman MJ, Price NPJ, Bischoff KM, Rich JO, Skory CD, Nunnally MS. Inhibition of Erwinia amylovora by Bacillus nakamurai. Curr Microbiol 2020; 77:875-881. [PMID: 31938805 DOI: 10.1007/s00284-019-01845-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 12/11/2019] [Indexed: 11/29/2022]
Abstract
A variety of potential inhibitors were tested for the first time for the suppression of Erwinia amylovora, the causal agent of fire blight in apples and pears. Strain variability was evident in susceptibility to inhibitors among five independently isolated virulent strains of E. amylovora. However, most strains were susceptible to culture supernatants from strains of Bacillus spp., and particularly to the recently described species B. nakamurai. Minimal inhibitory concentrations (MICs) were 5-20% (vol/vol) of culture supernatant from B. nakamurai against all five strains of E. amylovora. Although Bacillus species have been previously reported to produce lipopeptide inhibitors of E. amylovora, matrix-assisted laser desorption time of flight mass spectrometry (MALDI-TOF MS) and column chromatography indicated that the inhibitor from B. nakamurai was not a lipopeptide, but rather a novel inhibitor.
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Affiliation(s)
- Timothy D Leathers
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA.
| | - Lauren P Saunders
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Michael J Bowman
- Bioenergy Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Neil P J Price
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Kenneth M Bischoff
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Joseph O Rich
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Christopher D Skory
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
| | - Melinda S Nunnally
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA
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Ceccato-Antonini SR. Conventional and nonconventional strategies for controlling bacterial contamination in fuel ethanol fermentations. World J Microbiol Biotechnol 2018; 34:80. [PMID: 29802468 DOI: 10.1007/s11274-018-2463-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/23/2018] [Indexed: 12/17/2022]
Abstract
Ethanol bio-production in Brazil has some unique characteristics that inevitably lead to bacterial contamination, which results in the production of organic acids and biofilms and flocculation that impair the fermentation yield by affecting yeast viability and diverting sugars to metabolites other than ethanol. The ethanol-producing units commonly give an acid treatment to the cells after each fermentative cycle to decrease the bacterial number, which is not always effective. An alternative strategy must be employed to avoid bacterial multiplication but must be compatible with economic, health and environmental aspects. This review analyzes the issue of bacterial contamination in sugarcane-based fuel ethanol fermentation, and the potential strategies that may be utilized to control bacterial growth besides acid treatment and antibiotics. We have emphasized the efficiency and suitability of chemical products other than acids and those derived from natural sources in industrial conditions. In addition, we have also presented bacteriocins, bacteriophages, and beneficial bacteria as non-conventional antimicrobial agents to mitigate bacterial contamination in the bioethanol industry.
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Affiliation(s)
- Sandra Regina Ceccato-Antonini
- Laboratory of Molecular and Agricultural Microbiology, Department Tecnologia Agroindustrial e Sócio-Economia Rural, Centro de Ciencias Agrárias, Universidade Federal de São Carlos, Via Anhanguera km 174, Araras, SP, 13600-970, Brazil.
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Leathers TD, Bischoff KM, Rich JO, Price NPJ, Manitchotpisit P, Nunnally MS, Anderson AM. Inhibitors of biofilm formation by biofuel fermentation contaminants. BIORESOURCE TECHNOLOGY 2014; 169:45-51. [PMID: 25022836 DOI: 10.1016/j.biortech.2014.06.065] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 06/17/2014] [Accepted: 06/18/2014] [Indexed: 06/03/2023]
Abstract
Biofuel fermentation contaminants such as Lactobacillus sp. may persist in production facilities by forming recalcitrant biofilms. In this study, biofilm-forming strains of Lactobacillus brevis, Lactobacillus fermentum, and Lactobacillus plantarum were isolated and characterized from a dry-grind fuel ethanol plant. A variety of potential biofilm inhibitors were tested, including microbial polysaccharides, commercial enzymes, ferric ammonium citrate, liamocins, phage endolysin, xylitol, and culture supernatants from Bacillus sp. A commercial enzyme mixture (Novozyme 188) and culture supernatants from Bacillus subtilis strains ALT3A and RPT-82412 were identified as the most promising biofilm inhibitors. In biofilm flow cells, these inhibitors reduced the density of viable biofilm cells by 0.8-0.9 log cfu/cm(2). Unlike B. subtilis strain RPT-82412, B. subtilis strain ALT3A and Novozyme 188 did not inhibit planktonic growth of Lactobacillus sp. MALDI-TOF mass spectra showed the production of surfactin-like molecules by both B. subtilis strains, and the coproduction of iturin-like molecules by strain RPT-82412.
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Affiliation(s)
- Timothy D Leathers
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1).
| | - Kenneth M Bischoff
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1)
| | - Joseph O Rich
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1)
| | - Neil P J Price
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1)
| | - Pennapa Manitchotpisit
- Biochemistry Unit, Department of Medical Sciences, Faculty of Science, Rangsit University, 52/347 Muang Ake, Phaholyothin Rd., Lakhok, Pathumthani 12000, Thailand
| | - Melinda S Nunnally
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1)
| | - Amber M Anderson
- Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA(1)
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