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Olmedo GM, Debes MA, Sepúlveda M, Ramallo J, Rapisarda VA, Cerioni L, Volentini SI. Overcoming lemon postharvest molds caused by Penicillium spp. multiresistant isolates by the application of potassium sorbate in aqueous and wax treatments. J Food Sci 2023. [PMID: 37249091 DOI: 10.1111/1750-3841.16623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/25/2023] [Accepted: 05/13/2023] [Indexed: 05/31/2023]
Abstract
Penicillium digitatum and Penicillium italicum are the main causal agents of postharvest diseases in lemon. Over the last decades, the appearance of isolates resistant to the main commercial fungicides has been considered one of the most serious problems for the citrus industry. In this work, potassium sorbate (KS) was evaluated as an alternative to chemical fungicides to control postharvest diseases caused by Penicillium isolates resistant to imazalil, thiabendazol, and pyrimethanil. In vitro assays showed that 1% KS inhibited conidia germination and mycelial growth of sensitive and resistant P. digitatum and P. italicum isolates, being this effect stronger at pH 5 than at pH 9. In curative treatments, the immersion of inoculated lemons in 1% KS aqueous solution for 30 s reduced green and blue molds incidences by around 80%. No wound protection effect was observed when wounded lemons were immersed in 3% salt solution before inoculation. Noteworthy, the inclusion of KS in a commercial wax coating effectively controlled green and blue molds, even in decays caused by fungicide resistance isolates. Together, results encourage the use of KS in lemon postharvest treatments to contribute to the management of resistant strains, which represent a major challenge in packinghouses worldwide. PRACTICAL APPLICATION: The use of KS in citrus postharvest treatments would help producers to reduce spoilage caused by Penicillium fungicide-resistant strains. The inclusion of this generally recognized as safe compound in wax coatings improves its persistence on the fruit surface, keeping product quality during long-term overseas transport. In sum, KS constitutes an affordable and eco-friendly option for controlling postharvest molds in lemon fruit.
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Affiliation(s)
- Gabriela M Olmedo
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, San Miguel de Tucumán, Argentina
| | - Mario A Debes
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, San Miguel de Tucumán, Argentina
- Facultad de Ciencias Naturales e Instituto Miguel Lillo, San Miguel de Tucumán, Argentina
| | - Milena Sepúlveda
- Laboratorio de Desarrollo e Investigación, SA San Miguel, San Miguel de Tucumán, Argentina
| | - Jacqueline Ramallo
- Laboratorio de Desarrollo e Investigación, SA San Miguel, San Miguel de Tucumán, Argentina
| | - Viviana A Rapisarda
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, San Miguel de Tucumán, Argentina
| | - Luciana Cerioni
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, San Miguel de Tucumán, Argentina
| | - Sabrina I Volentini
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, San Miguel de Tucumán, Argentina
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Olmedo GM, Baigorria CG, Ramallo AC, Sepulveda M, Ramallo J, Volentini SI, Rapisarda VA, Cerioni L. Inhibition of the lemon brown rot causal agent Phytophthora citrophthora by low-toxicity compounds. J Sci Food Agric 2021; 101:3613-3619. [PMID: 33275277 DOI: 10.1002/jsfa.10990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 11/20/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND Phytophthora spp., soil-borne oomycetes, cause brown rot (BR) on postharvest lemons. The management of this disease is based on cultural practices and chemical control using inorganic salts of limited efficacy. In the search for new alternatives, the aim of this work was to evaluate the effect of low-toxicity compounds to inhibit the growth of P. citrophthora and to control BR disease on lemons. Sodium bicarbonate, potassium sorbate, polyhexamethylene guanidine, Ascophyllum nodosum extract and a formulation containing phosphite salts plus A. nodosum (P+An) were evaluated. RESULTS All tested products inhibited mycelial growth, sporangia formation and zoospore germination of P. citrophthora in vitro. In postharvest applications on artificially inoculated lemons, only P+An exhibited a BR curative effect, with incidence reduction of around 60%. When this formulation was applied in field treatments, BR incidence was reduced by 40% on lemons harvested and inoculated up to 30 days post application. CONCLUSION Our results demonstrate the in vitro direct anti-oomycete effect of low-toxicity compounds and the in vivo efficacy of P+An formulation to control BR, encouraging the incorporation of the latter in the management of citrus BR. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Gabriela M Olmedo
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
| | - Carina G Baigorria
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
| | - Ana C Ramallo
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
| | - Milena Sepulveda
- Laboratorio de Desarrollo e Investigación, SA San Miguel, San Miguel de Tucumán, Argentina
| | - Jacqueline Ramallo
- Laboratorio de Desarrollo e Investigación, SA San Miguel, San Miguel de Tucumán, Argentina
| | - Sabrina I Volentini
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
| | - Viviana A Rapisarda
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
| | - Luciana Cerioni
- Facultad de Bioquímica, Química y Farmacia, UNT, CONICET-UNT, and Instituto Superior de Investigaciones Biológicas (INSIBIO), and Instituto de Química Biológica 'Dr Bernabé Bloj', San Miguel de Tucumán, Argentina
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Grillo-Puertas M, Villegas JM, Pankievicz VCS, Tadra-Sfeir MZ, Teles Mota FJ, Hebert EM, Brusamarello-Santos L, Pedraza RO, Pedrosa FO, Rapisarda VA, Souza EM. Transcriptional Responses of Herbaspirillum seropedicae to Environmental Phosphate Concentration. Front Microbiol 2021; 12:666277. [PMID: 34177845 PMCID: PMC8222739 DOI: 10.3389/fmicb.2021.666277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 04/29/2021] [Indexed: 12/02/2022] Open
Abstract
Herbaspirillum seropedicae is a nitrogen-fixing endophytic bacterium associated with important cereal crops, which promotes plant growth, increasing their productivity. The understanding of the physiological responses of this bacterium to different concentrations of prevailing nutrients as phosphate (Pi) is scarce. In some bacteria, culture media Pi concentration modulates the levels of intracellular polyphosphate (polyP), modifying their cellular fitness. Here, global changes of H. seropedicae SmR1 were evaluated in response to environmental Pi concentrations, based on differential intracellular polyP levels. Cells grown in high-Pi medium (50 mM) maintained high polyP levels in stationary phase, while those grown in sufficient Pi medium (5 mM) degraded it. Through a RNA-seq approach, comparison of transcriptional profiles of H. seropedicae cultures revealed that 670 genes were differentially expressed between both Pi growth conditions, with 57% repressed and 43% induced in the high Pi condition. Molecular and physiological analyses revealed that aspects related to Pi metabolism, biosynthesis of flagella and chemotaxis, energy production, and polyhydroxybutyrate metabolism were induced in the high-Pi condition, while those involved in adhesion and stress response were repressed. The present study demonstrated that variations in environmental Pi concentration affect H. seropedicae traits related to survival and other important physiological characteristics. Since environmental conditions can influence the effectiveness of the plant growth-promoting bacteria, enhancement of bacterial robustness to withstand different stressful situations is an interesting challenge. The obtained data could serve not only to understand the bacterial behavior in respect to changes in rhizospheric Pi gradients but also as a base to design strategies to improve different bacterial features focusing on biotechnological and/or agricultural purposes.
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Affiliation(s)
- Mariana Grillo-Puertas
- Instituto de Química Biológica, “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán (UNT) and Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, San Miguel de Tucumán, Argentina
| | - Josefina M. Villegas
- Instituto de Química Biológica, “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán (UNT) and Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, San Miguel de Tucumán, Argentina
| | - Vânia C. S. Pankievicz
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Brazil
| | - Michelle Z. Tadra-Sfeir
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Brazil
| | - Francisco J. Teles Mota
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Brazil
| | - Elvira M. Hebert
- Centro de Referencia para Lactobacilos (CERELA-CONICET), San Miguel de Tucumán, Argentina
| | | | - Raul O. Pedraza
- Facultad de Agronomía y Zootecnia, Universidad Nacional de Tucumán (UNT), San Miguel de Tucumán, Argentina
| | - Fabio O. Pedrosa
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Brazil
| | - Viviana A. Rapisarda
- Instituto de Química Biológica, “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán (UNT) and Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, San Miguel de Tucumán, Argentina
| | - Emanuel M. Souza
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Brazil
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Olmedo GM, Cerioni L, Sepulveda M, Ramallo J, Rapisarda VA, Volentini SI. Polyhexamethylene guanidine as a fungicide, disinfectant and wound protector in lemons challenged with Penicillium digitatum. Food Microbiol 2018; 76:128-134. [DOI: 10.1016/j.fm.2018.03.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 02/23/2018] [Accepted: 03/18/2018] [Indexed: 11/27/2022]
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Olmedo GM, Cerioni L, González MM, Cabrerizo FM, Rapisarda VA, Volentini SI. Antifungal activity of β-carbolines on Penicillium digitatum and Botrytis cinerea. Food Microbiol 2017; 62:9-14. [DOI: 10.1016/j.fm.2016.09.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 08/11/2016] [Accepted: 09/15/2016] [Indexed: 11/30/2022]
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Olmedo GM, Cerioni L, González MM, Cabrerizo FM, Volentini SI, Rapisarda VA. UVA Photoactivation of Harmol Enhances Its Antifungal Activity against the Phytopathogens Penicillium digitatum and Botrytis cinerea. Front Microbiol 2017; 8:347. [PMID: 28326067 PMCID: PMC5339243 DOI: 10.3389/fmicb.2017.00347] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 02/20/2017] [Indexed: 11/15/2022] Open
Abstract
Phytopathogenic fungi responsible for post-harvest diseases on fruit and vegetables cause important economic losses. We have previously reported that harmol (1-methyl-9H-pyrido[3,4-b]indol-7-ol) is active against the causal agents of green and gray molds Penicillium digitatum and Botrytis cinerea, respectively. Here, antifungal activity of harmol was characterized in terms of pH dependency and conidial targets; also photodynamic effects of UVA irradiation on the antimicrobial action were evaluated. Harmol was able to inhibit the growth of both post-harvest fungal disease agents only in acidic conditions (pH 5), when it was found in its protonated form. Conidia treated with harmol exhibited membrane integrity loss, cell wall disruption, and cytoplasm disorganization. All these deleterious effects were more evident for B. cinerea in comparison to P. digitatum. When conidial suspensions were irradiated with UVA in the presence of harmol, antimicrobial activity against both pathogens was enhanced, compared to non-irradiated conditions. B. cinerea exhibited a high intracellular production of reactive oxygen species (ROS) when was incubated with harmol in irradiated and non-irradiated treatments. P. digitatum showed a significant increase in ROS accumulation only when treated with photoexcited harmol. The present work contributes to unravel the antifungal activity of harmol and its photoexcited counterpart against phytopathogenic conidia, focusing on ROS accumulation which could account for damage on different cellular targets.
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Affiliation(s)
- Gabriela M. Olmedo
- INSIBIO (CONICET, UNT), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, UNTTucumán, Argentina
| | - Luciana Cerioni
- INSIBIO (CONICET, UNT), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, UNTTucumán, Argentina
| | | | | | - Sabrina I. Volentini
- INSIBIO (CONICET, UNT), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, UNTTucumán, Argentina
| | - Viviana A. Rapisarda
- INSIBIO (CONICET, UNT), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, UNTTucumán, Argentina
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Grillo-Puertas M, Rintoul MR, Rapisarda VA. PhoB activation in non-limiting phosphate condition by the maintenance of high polyphosphate levels in the stationary phase inhibits biofilm formation in Escherichia coli. Microbiology (Reading) 2016; 162:1000-1008. [PMID: 27023099 DOI: 10.1099/mic.0.000281] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Polyphosphate (polyP) degradation in Escherichia coli stationary phase triggers biofilm formation via the LuxS quorum sensing system. In media containing excess of phosphate (Pi), high polyP levels are maintained in the stationary phase with the consequent inhibition of biofilm formation. The transcriptional-response regulator PhoB, which is activated under Pi limitation, is involved in the inhibition of biofilm formation in several bacterial species. In the current study, we report, for the first time, we believe that E. coli PhoB can be activated in non-limiting Pi conditions, leading to inhibition of biofilm formation. In fact, PhoB was activated when high polyP levels were maintained in the stationary phase, whereas it remained inactive when the polymer was degraded or absent. PhoB activation was mediated by acetyl phosphate with the consequent repression of biofilm formation owing to the downregulation of c-di-GMP synthesis and the inhibition of autoinducer-2 production. These results allowed us to propose a model showing that PhoB is a component in the signal cascade regulating biofilm formation triggered by fluctuations of polyP levels in E. coli cells during stationary phase.
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Affiliation(s)
- M Grillo-Puertas
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina.,Instituto de Química Biológica, 'Dr Bernabe Bloj', Facultad de Bioquímica, Química y Farmacia, UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina
| | - M R Rintoul
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina.,Instituto de Química Biológica, 'Dr Bernabe Bloj', Facultad de Bioquímica, Química y Farmacia, UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina
| | - V A Rapisarda
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina.,Instituto de Química Biológica, 'Dr Bernabe Bloj', Facultad de Bioquímica, Química y Farmacia, UNT, Chacabuco 461, T4000ILI - San Miguel de Tucumán, Tucumán, Argentina
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Grillo-Puertas M, Martínez-Zamora MG, Rintoul MR, Soto SM, Rapisarda VA. Environmental phosphate differentially affects virulence phenotypes of uropathogenic Escherichia coli isolates causative of prostatitis. Virulence 2015; 6:608-17. [PMID: 26083279 DOI: 10.1080/21505594.2015.1059561] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
K-12 Escherichia coli cells grown in static media containing a critical phosphate (Pi) concentration ≥25 mM maintained a high polyphosphate (polyP) level in stationary phase, impairing biofilm formation, a phenomenon that is triggered by polyP degradation. Pi concentration in human urine fluctuates according to health state. Here, the influence of environmental Pi concentration on the occurrence of virulence traits in uropathogenic E. coli (UPEC) isolated from acute prostatitis patients was evaluated. After a first screening, 3 isolates were selected according to differential biofilm formation profiles depending on media Pi concentration. For each isolate, biofilm positive and negative conditions were established. Regardless of the isolate, biofilm formation capacity was accompanied with curli and cellulose production and expression of some key virulence factors associated with adhesion. When the selected isolates were grown in their non-biofilm-forming condition, low concentrations of nalidixic acid and ciprofloxacin induced biofilm formation. Interestingly, similar to laboratory strains, polyP degradation induced biofilm formation in the selected isolates. Data demonstrated the complexity of UPEC responses to environmental Pi and the importance of polyP metabolism in the virulence of clinical isolates.
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Affiliation(s)
- M Grillo-Puertas
- a Instituto Superior de Investigaciones Biológicas , INSIBIO (CONICET-UNT) and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia (UNT) ; Tucumán , Argentina
| | - M G Martínez-Zamora
- a Instituto Superior de Investigaciones Biológicas , INSIBIO (CONICET-UNT) and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia (UNT) ; Tucumán , Argentina
| | - M R Rintoul
- a Instituto Superior de Investigaciones Biológicas , INSIBIO (CONICET-UNT) and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia (UNT) ; Tucumán , Argentina
| | - S M Soto
- b Barcelona Center for International Health Research (CRESIB; Hospital Clinic-University of Barcelona) ; Barcelona , Spain
| | - V A Rapisarda
- a Instituto Superior de Investigaciones Biológicas , INSIBIO (CONICET-UNT) and Instituto de Química Biológica "Dr Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia (UNT) ; Tucumán , Argentina
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Cerioni L, Rapisarda VA, Doctor J, Fikkert S, Ruiz T, Fassel R, Smilanick JL. Use of Phosphite Salts in Laboratory and Semicommercial Tests to Control Citrus Postharvest Decay. Plant Dis 2013; 97:201-212. [PMID: 30722345 DOI: 10.1094/pdis-03-12-0299-re] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Potassium phosphite (KP) concentrations that inhibited the germination of 50% of Penicillium digitatum conidia were 229, 334, 360, 469, 498, or 580 mg/liter at pH 3, 4, 5, 6, 7, or 8, respectively. Increasing phosphate content in media reduced phosphite toxicity. To control green or blue mold, fruit were inoculated with P. digitatum or P. italicum, then immersed 24 h later in KP, calcium phosphite (CaP), sodium carbonate, sodium bicarbonate, or potassium sorbate for 1 min at 20 g/liter for each at 25 or 50°C. Mold incidence was lowest after potassium sorbate, CaP, or KP treatments at 50°C. CaP was often more effective than KP but left a white residue on fruit. KP was significantly more effective when fruit were stored at 10 or 15°C after treatment compared with 20°C. Acceptable levels of control were achieved only when KP was used in heated solutions or with fungicides. KP was compatible with imazalil (IMZ) and other fungicides and improved their effectiveness. KP increased thiabendazole or IMZ residues slightly. Phosphite residues did not change during storage for 3 weeks, except they declined when KP was applied with IMZ. KP caused no visible injuries or alteration in the rate of color change of citrus fruit in air or ethylene at 5 μl/liter.
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Affiliation(s)
- L Cerioni
- Instituto Superior de Investigaciones Biológicas-INSIBIO (CONICET-UNT), Chacabuco 461, Tucumán, CP T4000ILI, Argentina
| | - V A Rapisarda
- Instituto Superior de Investigaciones Biológicas-INSIBIO (CONICET-UNT), Chacabuco 461, Tucumán, CP T4000ILI, Argentina
| | - J Doctor
- FGS Packing Services, Exeter, CA 93221
| | - S Fikkert
- Plant Protectants, Inc., Visalia, CA 93291
| | - T Ruiz
- Pace International Co., Seattle 98101
| | - R Fassel
- Pace International Co., Seattle 98101
| | - J L Smilanick
- Instituto Superior de Investigaciones Biológicas-INSIBIO (CONICET-UNT), Chacabuco 461, Tucumán, CP T4000ILI, Argentina
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Grillo-Puertas M, Villegas JM, Rintoul MR, Rapisarda VA. Polyphosphate degradation in stationary phase triggers biofilm formation via LuxS quorum sensing system in Escherichia coli. PLoS One 2012; 7:e50368. [PMID: 23226268 PMCID: PMC3511525 DOI: 10.1371/journal.pone.0050368] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 10/19/2012] [Indexed: 12/12/2022] Open
Abstract
In most natural environments, association with a surface in a structure known as biofilm is the prevailing microbial life-style of bacteria. Polyphosphate (polyP), an ubiquitous linear polymer of hundreds of orthophosphate residues, has a crucial role in stress responses, stationary-phase survival, and it was associated to bacterial biofilm formation and production of virulence factors. In previous work, we have shown that Escherichia coli cells grown in media containing a critical phosphate concentration >37 mM maintained an unusual high polyP level in stationary phase. The aim of the present work was to analyze if fluctuations in polyP levels in stationary phase affect biofilm formation capacity in E. coli. Polymer levels were modulated by the media phosphate concentration or using mutant strains in polyP metabolism. Cells grown in media containing phosphate concentrations higher than 25 mM were defective in biofilm formation. Besides, there was a disassembly of 24 h preformed biofilm by the addition of high phosphate concentration to the medium. These phenotypes were related to the maintenance or re-synthesis of polyP in stationary phase in static conditions. No biofilm formation was observed in ppk(-)ppx(-) or ppk(-)ppx(-)/ppk(+) strains, deficient in polyP synthesis and hydrolysis, respectively. luxS and lsrK mutants, impaired in autoinducer-2 quorum sensing signal metabolism, were unable to form biofilm unless conditioned media from stationary phase wild type cells grown in low phosphate were used. We conclude that polyP degradation is required for biofilm formation in sufficient phosphate media, activating or triggering the production of autoinducer-2. According to our results, phosphate concentration of the culture media should be carefully considered in bacterial adhesion and virulence studies.
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Affiliation(s)
| | | | | | - Viviana A. Rapisarda
- Instituto Superior de Investigaciones Biológicas (Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de Tucumán), and Instituto de Química Biológica “Dr Bernabé Bloj” (Universidad Nacional de Tucumán), San Miguel de Tucumán, Tucumán, Argentina
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Villegas JM, Volentini SI, Rintoul MR, Rapisarda VA. Amphipathic C-terminal region of Escherichia coli NADH dehydrogenase-2 mediates membrane localization. Arch Biochem Biophys 2010; 505:155-9. [PMID: 20933494 DOI: 10.1016/j.abb.2010.10.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 10/02/2010] [Accepted: 10/04/2010] [Indexed: 01/19/2023]
Abstract
Respiratory NADH dehydrogenase-2 (NDH-2) of Escherichia coli is a membrane-bound flavoprotein. Bioinformatics approaches suggested the involvement of NDH-2 C-terminal region in membrane anchorage. Here, we demonstrated that NDH-2 is a peripheral membrane protein and that its predicted C-terminal amphipathic Arg390-Ala406 helix is sufficient to bind the protein to lipid membranes. Additionally, a cytosolic NDH-2 protein (Trun-3), lacking the last 43 aminoacids, was purified and characterized. FAD cofactor was absent in purified Trun-3. Upon the addition of FAD, Trun-3 maximum velocity was similar to native NDH-2 rate with ferricyanide and MTT acceptors. However, Trun-3 activity was around 5-fold lower with quinones. No significant difference in K(m) values was observed for both enzymes. For the first time, an active and water soluble NDH-2 was obtained, representing a major improvement for structural/functional characterizations.
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Affiliation(s)
- Josefina M Villegas
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina
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Schurig-Briccio LA, Farías RN, Rodríguez-Montelongo L, Rintoul MR, Rapisarda VA. Protection against oxidative stress in Escherichia coli stationary phase by a phosphate concentration-dependent genes expression. Arch Biochem Biophys 2008; 483:106-10. [PMID: 19138658 DOI: 10.1016/j.abb.2008.12.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Revised: 12/18/2008] [Accepted: 12/23/2008] [Indexed: 11/17/2022]
Abstract
Escherichia coli gradually decline the capacity to resist oxidative stress during stationary phase. Besides the aerobic electron transport chain components are down-regulated in response to growth arrest. However, we have previously reported that E. coli cells grown in media containing at least 37mM phosphate maintained ndh expression in stationary phase, having high viability and low NADH/NAD(+) ratio. Here we demonstrated that, in the former condition, other aerobic respiratory genes (nuoAB, sdhC, cydA, and ubiC) expression was maintained. In addition, reactive oxygen species production was minimal and consequently the levels of thiobarbituric acid-reactive substances and protein carbonylation were lower than the expected for stationary cells. Interestingly, defense genes (katG and ahpC) expression was also maintained during this phase. Our results indicate that cells grown in high phosphate media exhibit advantages to resist endogenous and exogenous oxidative stress in stationary phase.
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Affiliation(s)
- Lici A Schurig-Briccio
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Técnicas-Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina
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Hilal M, Rodríguez-Montelongo L, Rosa M, Gallardo M, González JA, Interdonato R, Rapisarda VA, Prado FE. Solar and Supplemental UV-B Radiation Effects in Lemon Peel UV-B-absorbing Compound Content-Seasonal Variations. Photochem Photobiol 2008; 84:1480-6. [DOI: 10.1111/j.1751-1097.2008.00370.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Schurig-Briccio LA, Rintoul MR, Volentini SI, Farías RN, Baldomà L, Badía J, Rodríguez-Montelongo L, Rapisarda VA. A critical phosphate concentration in the stationary phase maintains ndh gene expression and aerobic respiratory chain activity in Escherichia coli. FEMS Microbiol Lett 2008; 284:76-83. [PMID: 18492062 DOI: 10.1111/j.1574-6968.2008.01188.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Escherichia coli NADH dehydrogenase-2 (NDH-2) is a primary dehydrogenase in aerobic respiration that shows cupric-reductase activity. The enzyme is encoded by ndh, which is highly regulated by global transcription factors. It was described that the gene is expressed in the exponential growth phase and repressed in late stationary phase. We report the maintenance of NDH-2 activity and ndh expression in the stationary phase when cells were grown in media containing at least 37 mM phosphate. Gene regulation was independent of RpoS and other transcription factors described to interact with the ndh promoter. At this critical phosphate concentration, cell viability, oxygen consumption rate, and NADH/NAD+ ratio were maintained in the stationary phase. These physiological parameters gradually changed, but NDH-2 activity remained high for up to 94 h. Phosphate seems to trigger an internal signal in the stationary phase mediated by systems not yet described.
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Affiliation(s)
- Lici A Schurig-Briccio
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas (Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de Tucumán), San Miguel de Tucumán, Argentina
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Radovic S, Rapisarda VA, Tosato V, Bruschi CV. Functional and comparative characterization of Saccharomyces cerevisiae RVB1 and RVB2 genes with bacterial Ruv homologues. FEMS Yeast Res 2007; 7:527-39. [PMID: 17302941 DOI: 10.1111/j.1567-1364.2006.00205.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Expression of yeast RuvB-like gene analogues of bacterial RuvB is self-regulated, as episomal overexpression of RVB1 and RVB2 decreases the expression of their chromosomal copies by 85%. Heterozygosity for either gene correlates with lower double-strand break repair of inverted-repeat DNA and decreased survival after UV irradiation, suggesting their haploinsufficiency, while overexpression of the bacterial RuvAB complex improves UV survival in yeast. Rvb2p preferentially binds artificial DNA Holiday junctions like the bacterial RuvAB complex, whereas Rvb1p binds to duplex or cruciform DNA. As both proteins also interact with chromatin, their role in recombination and repair through chromatin remodelling, and their evolutionary relationship to the bacterial homologue, is discussed.
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Affiliation(s)
- Slobodanka Radovic
- Yeast Molecular Genetics Group, ICGEB, Area Science Park - W, Trieste, Italy
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Rodríguez-Montelongo L, Volentini SI, Farías RN, Massa EM, Rapisarda VA. The Cu(II)-reductase NADH dehydrogenase-2 of Escherichia coli improves the bacterial growth in extreme copper concentrations and increases the resistance to the damage caused by copper and hydroperoxide. Arch Biochem Biophys 2006; 451:1-7. [PMID: 16759635 DOI: 10.1016/j.abb.2006.04.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2006] [Revised: 04/06/2006] [Accepted: 04/28/2006] [Indexed: 11/24/2022]
Abstract
NADH dehydrogenase-2 (NDH-2) from Escherichia coli respiratory chain is a membrane-bound cupric-reductase encoded by ndh gene. Here, we report that the respiratory system of a ndh deficient strain suffered a faster inactivation than that of the parental strain in the presence of tert-butyl hydroperoxide due to endogenous copper. The inactivation was similar for both strains when copper concentration increased in the culture media. Furthermore, several ndh deficient mutants grew less well than the corresponding parental strains in media containing either high or low copper concentrations. A mutant strain complemented with ndh gene almost recovered the parental phenotype for growing in copper limitation or excess. Then, NDH-2 gives the bacteria advantages to diminish the susceptibility of the respiratory chain to damaging effects produced by copper and hydroperoxides and to survive in extreme copper conditions. These results suggest that NDH-2 contributes in the bacterial oxidative protection and in the copper homeostasis.
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Affiliation(s)
- Luisa Rodríguez-Montelongo
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas (Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de Tucumán), San Miguel de Tucumán 4000, Argentina
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Rapisarda VA, Chehín RN, De Las Rivas J, Rodríguez-Montelongo L, Farías RN, Massa EM. Evidence for Cu(I)-thiolate ligation and prediction of a putative copper-binding site in the Escherichia coli NADH dehydrogenase-2. Arch Biochem Biophys 2002; 405:87-94. [PMID: 12176061 DOI: 10.1016/s0003-9861(02)00277-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
NADH dehydrogenase-2 (NDH-2) from Escherichia coli is a membrane-bound flavoprotein linked to the respiratory chain. We have previously shown that this enzyme has cupric reductase activity that is involved in hydroperoxide-induced oxidative stress. In this paper we present spectroscopic evidence that NDH-2 contains thiolate-bound Cu(I) with luminescence properties. Purified NDH-2 exhibits an emission band at 670nm with excitation wavelengths of 280 and 580nm. This emission is quenched by the specific Cu(I) chelator bathocuproine disulfonate, but not by EDTA. The luminescence intensity is sensitive to the enzyme substrates and, thus, the Cu(I)-thiolate chromophore reflects the redox and/or conformational states of the protein. There is one copper atom per polypeptide chain of the purified NDH-2, as determined by atomic absorption spectroscopy. Bioinformatics allowed us to recognize a putative copper-binding site and to predict four structural/functional domains in NDH-2: (I) the FAD-binding domain, (II) the NAD(H)-binding domain, (III) the copper-binding domain, and (IV) the domain of anchorage to the membrane containing two transmembrane helices, at the C-terminus. A NDH-2 topology model, based on the secondary structure prediction, is proposed. This is the first description of a copper-containing NADH dehydrogenase. Comparative sequence analysis allowed us to identify a branch of homologous dehydrogenases that bear a similar metal-binding motif.
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Affiliation(s)
- Viviana A Rapisarda
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Universidad Nacional de Tucumán, Chacabuco 461, San Miguel de Tucumán, Argentina
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Abstract
In this paper we report the up to now ignored fluorescence properties of the specific Cu(I)-chelator bathocuproine disulfonate and their application in assays of total copper and Cu(I). The method is based on the linear quenching of the bathocuproine disulfonate emission at 770 nm (lambda(ex)580 nm) by increasing concentrations of Cu(I), at pH 7.5. Copper concentrations as low as 0.1 microM can be determined. Other metal ions (iron, manganese, zinc, cadmium, cobalt, nickel) do not interfere. The procedure for total copper determination in proteins includes HCl treatment to release the copper, neutralization to pH 7.5 in the presence of citrate to stabilize the copper, and reduction of the copper to Cu(I) by ascorbate in the presence of the chelator. This assay gave results coincident with the analysis by atomic absorption spectroscopy in two selected proteins. In addition, conditions are described (omitting HCl treatment and reduction by ascorbate) for direct measurement of Cu(I) in native proteins, as illustrated for the Escherichia coli NADH dehydrogenase-2. Data show that the fluorometric assays described in this paper are simple and convenient procedures for total copper and direct Cu(I) quantification in determined biological samples.
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Affiliation(s)
- Viviana A Rapisarda
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina
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Rapisarda VA, Montelongo LR, Farías RN, Massa EM. Characterization of an NADH-linked cupric reductase activity from the Escherichia coli respiratory chain. Arch Biochem Biophys 1999; 370:143-50. [PMID: 10510271 DOI: 10.1006/abbi.1999.1398] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous results from our laboratory have shown that NADH-supported electron flow through the Escherichia coli respiratory chain promotes the reduction of cupric ions to Cu(I), which mediates damage of the respiratory system by hydroperoxides. The aim of this work was to characterize the NADH-linked cupric reductase activity from the E. coli respiratory chain. We have used E. coli strains that either overexpress or are deficient in the NADH dehydrogenase-2 (NDH-2) to demonstrate that this membrane-bound protein catalyzes the electron transfer from NADH to Cu(II), but not to Fe(III). We also show that purified NDH-2 exhibits NADH-supported Cu(II) reductase activity in the presence of either FAD or quinone, but is unable to reduce Fe(III). The K(m) values for free Cu(II) were 32 +/- 5 pM in the presence of saturating duroquinone and 22 +/- 2 pM in the presence of saturating FAD. The K(m) values for NADH were 6.9 +/- 1.5 microM and 6.1 +/- 0.7 microM in the presence of duroquinone and FAD, respectively. The quinone-dependent Cu(II) reduction occurred through both O(*-)(2)-mediated and O(*-)(2)-independent pathways, as evidenced by the partial inhibitory effect (30-50%) of superoxide dismutase, by the reaction stoichiometry, and by the enzyme turnover numbers for NADH and Cu(II). The cupric reductase activity of NDH-2 was dependent on thiol groups which were accessible to p-chloromercuribenzoate at low, but not at high, ionic strength of the medium, a fact apparently connected to a conformational change of the protein. To our knowledge, this is the first protein with cupric reductase activity to be isolated and characterized in its biochemical properties.
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Affiliation(s)
- V A Rapisarda
- Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas (Consejo Nacional de Investigaciones Científicas y Tecnológicas-Universidad Nacional de Tucumán), San Miguel de Turcumán, Argentina
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Abstract
In this work we investigated to what extent cellular metabolism and energetics regulate sporulation in Saccharomyces cerevisiae and which metabolic pathways are involved in such regulation. Sporulation, meiosis, and associated metabolic fluxes in S. cerevisiae strain CH1211 were studied in several experimental protocols involving changes of carbon source (acetate, lactate, or pyruvate) or cell density in sporulation medium, or changing the phase of batch growth at which cells were harvested before transfer to sporulation medium. In acetate-based sporulation medium, the rate at which cells utilized glyoxylate and gluconeogenic pathways correlated positively with the percentage of asci per cell at 72 h. In contrast, in lactate sporulation medium the frequency of sporulation correlated negatively with both the rate of lactate consumption and the fluxes through gluconeogenesis and the pyruvate-carboxylase catalyzed step. In the presence of lactate, the respiratory capacity did correlate positively with the percentage of asci per cell. The experimental data suggest that acetate limits fluxes to anabolic precursors during sporulation. In contrast, sporulation on lactate appears to be influenced by catabolic processes or, even more precisely, by the respiratory capacity of yeast cells. The results obtained are discussed in terms of the hypothesis that an imbalance between anabolic and catabolic fluxes may be required for an efficient sporulation.
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Affiliation(s)
- J C Aon
- Departamento de Bioquímica de la Nutrición, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Argentina
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