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Weiz G, González AL, Mansilla IS, Fernandez-Zapico ME, Molejón MI, Breccia JD. Rutinosides-derived from Sarocladium strictum 6-O-α-rhamnosyl-β-glucosidase show enhanced anti-tumoral activity in pancreatic cancer cells. Microb Cell Fact 2024; 23:133. [PMID: 38720294 PMCID: PMC11077868 DOI: 10.1186/s12934-024-02395-0] [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] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 04/16/2024] [Indexed: 05/12/2024] Open
Abstract
BACKGROUND Low targeting efficacy and high toxicity continue to be challenges in Oncology. A promising strategy is the glycosylation of chemotherapeutic agents to improve their pharmacodynamics and anti-tumoral activity. Herein, we provide evidence of a novel approach using diglycosidases from fungi of the Hypocreales order to obtain novel rutinose-conjugates therapeutic agents with enhanced anti-tumoral capacity. RESULTS Screening for diglycosidase activity in twenty-eight strains of the genetically related genera Acremonium and Sarocladium identified 6-O-α-rhamnosyl-β-glucosidase (αRβG) of Sarocladium strictum DMic 093557 as candidate enzyme for our studies. Biochemically characterization shows that αRβG has the ability to transglycosylate bulky OH-acceptors, including bioactive compounds. Interestingly, rutinoside-derivatives of phloroglucinol (PR) resorcinol (RR) and 4-methylumbelliferone (4MUR) displayed higher growth inhibitory activity on pancreatic cancer cells than the respective aglycones without significant affecting normal pancreatic epithelial cells. PR exhibited the highest efficacy with an IC50 of 0.89 mM, followed by RR with an IC50 of 1.67 mM, and 4MUR with an IC50 of 2.4 mM, whereas the respective aglycones displayed higher IC50 values: 4.69 mM for phloroglucinol, 5.90 mM for resorcinol, and 4.8 mM for 4-methylumbelliferone. Further, glycoconjugates significantly sensitized pancreatic cancer cells to the standard of care chemotherapy agent gemcitabine. CONCLUSIONS αRβG from S. strictum transglycosylate-based approach to synthesize rutinosides represents a suitable option to enhance the anti-proliferative effect of bioactive compounds. This finding opens up new possibilities for developing more effective therapies for pancreatic cancer and other solid malignancies.
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Affiliation(s)
- Gisela Weiz
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina.
| | - Alina L González
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Iara S Mansilla
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Martín E Fernandez-Zapico
- Schulze Center for Novel Therapeutics, Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - María I Molejón
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Javier D Breccia
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
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Baglioni M, Fries A, Müller JM, Omarini A, Müller M, Breccia JD, Mazzaferro LS. Acremonium sp. diglycosidase-aid chemical diversification: valorization of industry by-products. Appl Microbiol Biotechnol 2024; 108:250. [PMID: 38430417 PMCID: PMC10908641 DOI: 10.1007/s00253-023-12957-8] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 03/03/2024]
Abstract
The fungal diglycosidase α-rhamnosyl-β-glucosidase I (αRβG I) from Acremonium sp. DSM 24697 catalyzes the glycosylation of various OH-acceptors using the citrus flavanone hesperidin. We successfully applied a one-pot biocatalysis process to synthesize 4-methylumbellipheryl rutinoside (4-MUR) and glyceryl rutinoside using a citrus peel residue as sugar donor. This residue, which contained 3.5 % [w/w] hesperidin, is the remaining of citrus processing after producing orange juice, essential oil, and peel-juice. The low-cost compound glycerol was utilized in the synthesis of glyceryl rutinoside. We implemented a simple method for the obtention of glyceryl rutinoside with 99 % yield, and its purification involving activated charcoal, which also facilitated the recovery of the by-product hesperetin through liquid-liquid extraction. This process presents a promising alternative for biorefinery operations, highlighting the valuable role of αRβG I in valorizing glycerol and agricultural by-products. KEYPOINTS: • αRβG I catalyzed the synthesis of rutinosides using a suspension of OPW as sugar donor. • The glycosylation of aliphatic polyalcohols by the αRβG I resulted in products bearing a single rutinose moiety. • αRβG I catalyzed the synthesis of glyceryl rutinoside with high glycosylation/hydrolysis selectivity (99 % yield).
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Affiliation(s)
- Micaela Baglioni
- INCITAP-CONICET, FCEyN-Universidad Nacional de La Pampa (UNLPam), Av. Uruguay, 151, Santa Rosa, La Pampa, Argentina
| | - Alexander Fries
- INCITAP-CONICET, FCEyN-Universidad Nacional de La Pampa (UNLPam), Av. Uruguay, 151, Santa Rosa, La Pampa, Argentina
| | - Jan-Mathis Müller
- INCITAP-CONICET, FCEyN-Universidad Nacional de La Pampa (UNLPam), Av. Uruguay, 151, Santa Rosa, La Pampa, Argentina
- Institut für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstraße 25, 79104, Freiburg, Germany
| | - Alejandra Omarini
- Laboratorio de Biotecnología Fúngica y de los Alimentos. Asociación para el Desarrollo de Villa Elisa y Zona (ADVEZ), Héctor de Elia 1247, E3265, Villa Elisa, Entre Ríos, Argentina
| | - Michael Müller
- Institut für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstraße 25, 79104, Freiburg, Germany
| | - Javier D Breccia
- INCITAP-CONICET, FCEyN-Universidad Nacional de La Pampa (UNLPam), Av. Uruguay, 151, Santa Rosa, La Pampa, Argentina
| | - Laura S Mazzaferro
- INCITAP-CONICET, FCEyN-Universidad Nacional de La Pampa (UNLPam), Av. Uruguay, 151, Santa Rosa, La Pampa, Argentina.
- Institut für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstraße 25, 79104, Freiburg, Germany.
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Weiz G, Gonzalez AL, Piccioni F, Fusco M, Gutiérrez MD, Mazzolini G, Breccia JD, Malvicini M, Molejon MI. Abstract 5447: Enhanced antitumoral effect of the glycosylated 4-methylumbelliferone in hepatocellular carcinoma. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-5447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Hepatocellular carcinoma (HCC) is the fourth leading cause of cancer-related death worldwide, and is particularly refractory to the available therapeutic drugs. Unfortunately, curative treatments such as surgery, liver transplantation, or ablation are reserved for early stages and can only be applied in less than 30% of the patients with HCC. Glycosylation can be a potent and interesting strategy for drug delivery to a specific target. We enzymatically synthesized a glycosylated derivative of the coumarin 4-methylumbelliferone (4MU), namely 4MUR.The antitumoral effect of 4MUR in comparison with the aglycone 4MU was evaluated onto liver cancer cells. Cellular toxicity was determined on murine liver tumor cell lines as well as non-hepatic tumoral cells. Tumor cell lines were significantly more sensitive than non-tumoral cells to the glycosylated molecule in a dose-dependent manner (p<0.05). 4MUR was incorporated mostly into tumoral cells by the interaction with the asialoglycoprotein receptor (ASGPR), which is overexpressed in liver tumor cells. Hyaluronic acid (HA) is the major component of the extracellular matrix (ECM). It is produced at the plasma membrane by three hyaluronan synthases (HAS1, 2 and 3), which couple glucuronic acid and N-acetylglucosamine into a linear polymer using the corresponding UDP-sugars (UDP-GlcUA and UDP-GlcNAc) as substrates. Unlike 4MUR, the glucuronidation of 4MU competitively inhibits chain elongation of HA. Furthermore, 4MUR treatment regulates the levels of HAS2 and HAS3 expression in the tumoral cell line. Finally, 4MUR treatment induced apoptosis cell death in tumoral cells. Our results suggest that the 4MUR is safe and effective against liver tumor cells via a specific targeting to ASGPR receptor and decreasing HA synthesis.
Citation Format: Gisela Weiz, Alina L. Gonzalez, Flavia Piccioni, Mariel Fusco, Marco Diaz Gutiérrez, Guillermo Mazzolini, Javier D. Breccia, Mariana Malvicini, Maria I. Molejon. Enhanced antitumoral effect of the glycosylated 4-methylumbelliferone in hepatocellular carcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 5447.
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Affiliation(s)
- Gisela Weiz
- 1INCITAP-UNLPAM-CONICET, Santa Rosa, Argentina
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Weiz G, Molejon MI, Malvicini M, Sukowati CHC, Tiribelli C, Mazzolini G, Breccia JD. Glycosylated 4-methylumbelliferone as a targeted therapy for hepatocellular carcinoma. Liver Int 2022; 42:444-457. [PMID: 34800352 DOI: 10.1111/liv.15084] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 09/22/2021] [Accepted: 10/13/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS Reaching efficacious drug delivery to target cells/tissues represents a major obstacle in the current treatment of solid malignancies including hepatocellular carcinoma (HCC). In this study, we developed a pipeline to selective add complex-sugars to the aglycone 4-methylumbelliferone (4MU) to help their bioavailability and tumour cell intake. METHODS The therapeutic efficacy of sugar-modified rutinosyl-4-methylumbelliferone (4MUR) and 4MU were compared in vitro and in an orthotopic HCC model established in fibrotic livers. The mechanistic bases of its selective target to liver tumour cells were evaluated by the interaction with asialoglycoprotein receptor (ASGPR), the mRNA expression of hyaluronan synthases (HAS2 or HAS3) and hyaluronan deposition. RESULTS 4MUR showed a significant antiproliferative effect on liver tumoural cells as compared to non-tumoural cells in a dose-dependent manner. Further analysis showed that 4MUR is incorporated mostly into HCC cells by interaction with ASGPR, a receptor commonly overexpressed in HCC cells. 4MUR-treatment decreased the levels of HAS2 and HAS3 and the cytoplasmic deposition of hyaluronan. Moreover, 4MUR reduced CFSC-2G activation, hence reducing the fibrosis. In vivo efficacy showed that 4MUR treatment displayed a greater tumour growth inhibition and increased survival in comparison to 4MU. 4MUR administration was associated with a significant reduction of liver fibrosis without any signs of tissue damage. Further, 60% of 4MUR treated mice did not present macroscopically tumour mass post-treatment. CONCLUSION Our results provide evidence that 4MUR may be used as an effective HCC therapy, without damaging non-tumoural cells or other organs, most probably due to the specific targeting.
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Affiliation(s)
- Gisela Weiz
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Santa Rosa, Argentina
| | - Maria I Molejon
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Santa Rosa, Argentina
| | - Mariana Malvicini
- Laboratorio de Inmunobiología del Cáncer, Instituto de Investigaciones en Medicina Traslacional (IIMT) Facultad de Ciencias Biomédicas, CONICET, Universidad Austral, Derqui-Pilar, Argentina
| | | | - Claudio Tiribelli
- Fondazione Italiana Fegato, AREA Science Park Basovizza, Trieste, Italy
| | - Guillermo Mazzolini
- Gene Therapy Laboratory, Instituto de Investigaciones en Medicina Traslacional, Facultad de Ciencias Biomédicas, CONICET, Universidad Austral, Derqui-Pilar, Argentina.,Liver Unit, Hospital Universitario Austral, Universidad Austral, Derqui-Pilar, Argentina
| | - Javier D Breccia
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Santa Rosa, Argentina
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Molejon MI, Weiz G, Breccia JD, Vaccaro MI. Glycoconjugation: An approach to cancer therapeutics. World J Clin Oncol 2020; 11:110-120. [PMID: 32257842 PMCID: PMC7103525 DOI: 10.5306/wjco.v11.i3.110] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/31/2020] [Accepted: 02/08/2020] [Indexed: 02/06/2023] Open
Abstract
Cancer constitutes the second leading cause of death globally and is considered to have been responsible for an estimated 9.6 million fatalities in 2018. Although treatments against gastrointestinal tumors have recently advanced, those interventions can only be applied to a minority of patients at the time of diagnosis. Therefore, new therapeutic options are necessary for advanced stages of the disease. Glycosylation of antitumor agents, has been found to improve pharmacokinetic parameters, reduce side effects, and expand drug half-life in comparison with the parent compounds. In addition, glycosylation of therapeutic agents has been proven to be an effective strategy for their targeting tumor tissue, thereby reducing the doses of the glycodrugs administered to patients. This review focusses on the effect of the targeting properties of glycosylated antitumor agents on gastrointestinal tumors.
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Affiliation(s)
- Maria I Molejon
- Institute of Earth and Environmental Sciences from La Pampa (INCITAP), National University of La Pampa, School of Natural Sciences (CONICET-UNLPam), Santa Rosa 6300, La Pampa, Argentina
- Institute of Biochemistry and Molecular Medicine (UBA-CONICET), Department of Pathophysiology, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires C1113AAD, Argentina
| | - Gisela Weiz
- Institute of Earth and Environmental Sciences from La Pampa (INCITAP), National University of La Pampa, School of Natural Sciences (CONICET-UNLPam), Santa Rosa 6300, La Pampa, Argentina
| | - Javier D Breccia
- Institute of Earth and Environmental Sciences from La Pampa (INCITAP), National University of La Pampa, School of Natural Sciences (CONICET-UNLPam), Santa Rosa 6300, La Pampa, Argentina
| | - Maria Ines Vaccaro
- Institute of Biochemistry and Molecular Medicine (UBA-CONICET), Department of Pathophysiology, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires C1113AAD, Argentina
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Weiz G, Mazzaferro LS, Kotik M, Neher BD, Halada P, Křen V, Breccia JD. The flavonoid degrading fungus Acremonium sp. DSM 24697 produces two diglycosidases with different specificities. Appl Microbiol Biotechnol 2019; 103:9493-9504. [PMID: 31705182 DOI: 10.1007/s00253-019-10180-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/30/2019] [Accepted: 10/09/2019] [Indexed: 01/01/2023]
Abstract
AbstractDiglycosidases hydrolyze the heterosidic linkage of diglycoconjugates, releasing the disaccharide and the aglycone. Usually, these enzymes do not hydrolyze or present only low activities towards monoglycosylated compounds. The flavonoid degrading fungus Acremonium sp. DSM 24697 produced two diglycosidases, which were termed 6-O-α-rhamnosyl-β-glucosidase I and II (αRβG I and II) because of their function of releasing the disaccharide rutinose (6-O-α-L-rhamnosyl-β-D-glucose) from the diglycoconjugates hesperidin or rutin. In this work, the genome of Acremonium sp. DSM 24697 was sequenced and assembled with a size of ~ 27 Mb. The genes encoding αRβG I and II were expressed in Pichia pastoris KM71 and the protein products were purified with apparent molecular masses of 42 and 82 kDa, respectively. A phylogenetic analysis showed that αRβG I grouped in glycoside hydrolase family 5, subfamily 23 (GH5), together with other fungal diglycosidases whose substrate specificities had been reported to be different from αRβG I. On the other hand, αRβG II grouped in glycoside hydrolase family 3 (GH3) and thus is the first GH3 member that hydrolyzes the heterosidic linkage of rutinosylated compounds. The substrate scopes of the enzymes were different: αRβG I showed exclusive specificity toward 7-O-β-rutinosyl flavonoids, whereas αRβG II hydrolyzed both 7-O-β-rutinosyl- and 3-O-β-rutinosyl- flavonoids. None of the enzymes displayed activity toward 7-O-β-neohesperidosyl- flavonoids. The recombinant enzymes also exhibited transglycosylation activities, transferring rutinose from hesperidin or rutin onto various alcoholic acceptors. The different substrate scopes of αRβG I and II may be part of an optimized strategy of the original microorganism to utilize different carbon sources.
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Affiliation(s)
- Gisela Weiz
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Laura S Mazzaferro
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Michael Kotik
- Laboratory of Biotransformation, Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic
| | - Bárbara D Neher
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina
| | - Petr Halada
- Laboratory of Molecular Structure Characterization, Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic
| | - Vladimír Křen
- Laboratory of Biotransformation, Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic
| | - Javier D Breccia
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Universidad Nacional de La Pampa - Consejo Nacional de Investigaciones Científicas y Técnicas (UNLPam-CONICET), Av. Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina.
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Mazzaferro LS, Weiz G, Braun L, Kotik M, Pelantová H, Křen V, Breccia JD. Enzyme-mediated transglycosylation of rutinose (6-O-α-l-rhamnosyl-d-glucose) to phenolic compounds by a diglycosidase fromAcremoniumsp. DSM 24697. Biotechnol Appl Biochem 2018; 66:53-59. [DOI: 10.1002/bab.1695] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 10/04/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Laura S. Mazzaferro
- INCITAP (CONICET-UNLPam) National Scientific and Technical Research Council, Department of Chemistry, Faculty of Natural Sciences; National University of La Pampa (UNLPam); Santa Rosa La Pampa Argentina
| | - Gisela Weiz
- INCITAP (CONICET-UNLPam) National Scientific and Technical Research Council, Department of Chemistry, Faculty of Natural Sciences; National University of La Pampa (UNLPam); Santa Rosa La Pampa Argentina
| | - Lucas Braun
- INCITAP (CONICET-UNLPam) National Scientific and Technical Research Council, Department of Chemistry, Faculty of Natural Sciences; National University of La Pampa (UNLPam); Santa Rosa La Pampa Argentina
| | - Michael Kotik
- Laboratory of Biotransformation, Institute of Microbiology; Czech Academy of Sciences; Prague Czech Republic
| | - Helena Pelantová
- Laboratory of Molecular Structure Characterization, Institute of Microbiology; Czech Academy of Sciences; Prague Czech Republic
| | - Vladimír Křen
- Laboratory of Biotransformation, Institute of Microbiology; Czech Academy of Sciences; Prague Czech Republic
| | - Javier D. Breccia
- INCITAP (CONICET-UNLPam) National Scientific and Technical Research Council, Department of Chemistry, Faculty of Natural Sciences; National University of La Pampa (UNLPam); Santa Rosa La Pampa Argentina
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Pisa JH, Manfredi AP, Perotti NI, Romero HG, Breccia JD, Martínez MA. Agrowastes as Feedstock for the Production of Endo-β-Xylanase from Cohnella sp. Strain AR92. J Mol Microbiol Biotechnol 2017; 27:277-288. [DOI: 10.1159/000480541] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 08/17/2017] [Indexed: 11/19/2022] Open
Abstract
Members of <i>Cohnella </i>sp. isolated from a variety of environments have been shown to be glycoside hydrolase producers. Nevertheless, most evaluations of members of this genus are limited to their taxonomic description. The strain AR92, previously identified as belonging to the genus <i>Cohnella</i>, formed a well-supported cluster with <i>C. thailandensis</i> and <i>C. formosensis</i> (>80% bootstrap confidence). Its growth and xylanase production were approached by using a mineral-based medium containing alkali-pretreated sugarcane bagasse as the main carbon source, which was assayed as a convenient source to produce biocatalysts potentially fitting its degradation. By means of a two-step statistical approach, the production of endoxylanase was moderately improved (20%). However, a far more significant improvement was observed (145%), by increasing the inoculum size and lowering the fermentation temperature to 25°C, which is below the optimal growth temperature of the strain AR92 (37°C). The xylanolytic preparation produced by <i>Cohnella</i> sp. AR92 contained mild temperature-active endoxylanase (identified as redundant GH10 family) for the main activity which resulted in xylobiose and xylo-oligosaccharides as the main products from birchwood xylan.
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Weiz G, Breccia JD, Mazzaferro LS. Screening and quantification of the enzymatic deglycosylation of the plant flavonoid rutin by UV–visible spectrometry. Food Chem 2017; 229:44-49. [DOI: 10.1016/j.foodchem.2017.02.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/02/2017] [Accepted: 02/07/2017] [Indexed: 10/20/2022]
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Fuchs LI, Fort MC, Cano D, Bonetti CM, Giménez HD, Vázquez PM, Bacigalupe D, Breccia JD, Campero CM, Oyhenart JA. Clearance of Tritrichomonas foetus in experimentally infected heifers protected with vaccines based on killed-T. foetus with different adjuvants. Vaccine 2017; 35:1341-1346. [PMID: 28185741 DOI: 10.1016/j.vaccine.2016.12.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/13/2016] [Accepted: 12/14/2016] [Indexed: 11/15/2022]
Abstract
Tritrichomonas foetus is a flagellated protozoan that causes a sexually transmitted disease in cattle. Trichomonosis is characterized by early abortions, subfertility and a significant decrease in productivity. Vaccine preparations containing whole T. foetus can reduce the time of residence of the pathogen in the host cervix after experimental infection. Here, T. foetus vaccines prepared with different adjuvants were tested, in parallel with a commercial vaccine, for their efficacy to clear the infection. The median time for clearance of infection was 69days in non-immunized animals, 55days in animals treated with aluminum hydroxide, 41days with oil-in-water or saponin based vaccines or with a commercial vaccine and 27days in animals treated with saponin plus aluminum hydroxide. A slight increase in the risk of T. foetus clearance from the genital tract was found with the saponin based vaccine (hazard ratio, 2.52; 95% confidence interval, 1.03-6.17) or the commercial vaccine (hazard ratio, 2.61; 95% confidence interval, 1.07-6.38). A significant increase in the risk of T. foetus clearance was found with the combination of saponin plus aluminum hydroxide based vaccine (hazard ratio, 5.12; 95% confidence interval, 2.04-12.83).
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Affiliation(s)
- Lumila I Fuchs
- Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta 5 km 580, Anguil, La Pampa, Argentina
| | - Marcelo C Fort
- Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta 5 km 580, Anguil, La Pampa, Argentina
| | - Dora Cano
- Instituto Nacional de Tecnología Agropecuaria (INTA), 7620 Balcarce, Argentina
| | - Carina M Bonetti
- Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta 5 km 580, Anguil, La Pampa, Argentina
| | - Hugo D Giménez
- Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta 5 km 580, Anguil, La Pampa, Argentina
| | - Pablo M Vázquez
- Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta 5 km 580, Anguil, La Pampa, Argentina
| | - Diana Bacigalupe
- Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata (UNLP), Argentina
| | - Javier D Breccia
- INCITAP, CONICET-UNLPam, Uruguay 151, Santa Rosa, La Pampa, Argentina
| | - Carlos M Campero
- Instituto Nacional de Tecnología Agropecuaria (INTA), 7620 Balcarce, Argentina
| | - Jorge A Oyhenart
- INCITAP, CONICET-UNLPam, Uruguay 151, Santa Rosa, La Pampa, Argentina.
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Piñuel L, Breccia JD, Guisán JM, López-Gallego F. Production of hesperetin using a covalently multipoint immobilized diglycosidase from Acremonium sp. DSM24697. J Mol Microbiol Biotechnol 2013; 23:410-7. [PMID: 24022493 DOI: 10.1159/000353208] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The diglycosidase α-rhamnosyl-β-glucosidase (EC 3.2.1.168) from the fungus Acremonium sp. DSM24697 was immobilized on several agarose-based supports. Covalent multipoint immobilization onto glyoxyl-activated agarose was selected as the more stable preparation at high concentration of dimethyl sulfoxide (DMSO) and high temperature. The optimal conditions for the immobilization process involved an incubation of the enzyme with agarose beads containing 220 μmol of glyoxyl groups per gram at pH 10 and 25°C for 24 h. The hydrolysis of hesperidin carried out in 10% v/v DMSO at 60°C for 2 h reached 64.6% substrate conversion and a specific productivity of 2.40 mmol h(-1) g(-1). Under these conditions, the process was performed reutilizing the catalyst for up to 18 cycles, maintaining >80% of the initial activity and a constant productivity 2.96 ± 0.42 µmol(-1) h(-1) g(-1). To the best of our knowledge, such productivity is the highest achieved for hesperetin production through an enzymatic approach.
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Affiliation(s)
- Lucrecia Piñuel
- INCITAP-CONICET Facultad Ciencias Exactas y Naturales, Universidad Nacional de La Pampa (UNLPam), Santa Rosa, Argentina
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12
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Oyhenart J, Martínez F, Ramírez R, Fort M, Breccia JD. Loop mediated isothermal amplification of 5.8S rDNA for specific detection of Tritrichomonas foetus. Vet Parasitol 2012; 193:59-65. [PMID: 23265811 PMCID: PMC7116945 DOI: 10.1016/j.vetpar.2012.11.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [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: 03/21/2012] [Revised: 11/14/2012] [Accepted: 11/27/2012] [Indexed: 01/12/2023]
Abstract
Tritrichomonas foetus is the causative agent of bovine trichomonosis, a sexually transmitted disease leading to infertility and abortion. A test based on loop mediated isothermal amplification (LAMP) targeting the 5.8S rDNA subunit was designed for the specific identification of T. foetus. The LAMP assay was validated using 28 T. foetus and 35 non-T. foetus trichomonads strains. It did not exhibit cross-reaction with closely related parasites commonly found in smegma cultures like Tetratrichomonas spp. and Pentatrichomonas hominis. Bovine smegma did not show interferences for the detection of the parasite and, the sensitivity of the method (4 × 103 CFU/mL, approximately 10 cells/reaction) was slightly higher than that found for PCR amplification with TFR3 and TFR4 primers. The LAMP approach has potential applications for diagnosis and control of T. foetus and, practical use for low skill operators in rural areas.
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Affiliation(s)
- Jorge Oyhenart
- INCITAP - CONICET - Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina.
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13
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Mazzaferro LS, Breccia JD. Quantification of hesperidin in citrus-based foods using a fungal diglycosidase. Food Chem 2012; 134:2338-44. [DOI: 10.1016/j.foodchem.2012.03.107] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Revised: 03/07/2012] [Accepted: 03/24/2012] [Indexed: 10/28/2022]
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14
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Góngora HG, Ledesma P, Valvo VRL, Ruiz AE, Breccia JD. Screening of lactic acid bacteria for fermentation of minced wastes of Argentinean hake (Merluccius hubbsi). Food and Bioproducts Processing 2012. [DOI: 10.1016/j.fbp.2012.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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15
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16
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Mazzaferro LS, Piñuel L, Erra-Balsells R, Giudicessi SL, Breccia JD. Transglycosylation specificity of Acremonium sp. α-rhamnosyl-β-glucosidase and its application to the synthesis of the new fluorogenic substrate 4-methylumbelliferyl-rutinoside. Carbohydr Res 2011; 347:69-75. [PMID: 22169180 DOI: 10.1016/j.carres.2011.11.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 11/08/2011] [Accepted: 11/11/2011] [Indexed: 10/15/2022]
Abstract
Transglycosylation potential of the fungal diglycosidase α-rhamnosyl-β-glucosidase was explored. The biocatalyst was shown to have broad acceptor specificity toward aliphatic and aromatic alcohols. This feature allowed the synthesis of the diglycoconjugated fluorogenic substrate 4-methylumbelliferyl-rutinoside. The synthesis was performed in one step from the corresponding aglycone, 4-methylumbelliferone, and hesperidin as rutinose donor. 4-Methylumbelliferyl-rutinoside was produced in an agitated reactor using the immobilized biocatalyst with a 16% yield regarding the sugar acceptor. The compound was purified by solvent extraction and silica gel chromatography. MALDI-TOF/TOF data recorded for the [M+Na](+) ions correlated with the theoretical monoisotopic mass (calcd [M+Na](+): 507.44 m/z; obs. [M+Na](+): 507.465 m/z). 4-Methylumbelliferyl-rutinoside differs from 4-methylumbelliferyl-glucoside in the rhamnosyl substitution at the C-6 of glucose, and this property brings about the possibility to explore in nature the occurrence of endo-β-glucosidases by zymographic analysis.
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Affiliation(s)
- Laura S Mazzaferro
- INCITAP-CONICET, Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina
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17
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Fort M, Baldone V, Fuchs L, Giménez H, Rojas M, Breccia JD, Oyhenart J. Experimental infection of rabbits (Oryctolagus cuniculus) with Brucella suis biovar 1 isolated from wild hares (Lepus europaeus). Vet Microbiol 2011; 156:439-42. [PMID: 22137773 DOI: 10.1016/j.vetmic.2011.11.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 11/04/2011] [Accepted: 11/07/2011] [Indexed: 11/25/2022]
Abstract
Brucella suis biovar 1 is the causative agent of brucellosis in several domestic and wild animals and it is a common agent of human brucellosis. European hares (Lepus europaeus) have been shown to be infected by B. suis biovar 1 and the transmission to other animals has been suggested. In this work, experimental rabbits (Cuniculus orictolagus) were infected with B. suis biovar 1 isolated from wild hares. Infected rabbits showed high serological response in 2 weeks after discharge and typical granulomatous lesions (2mm diameter) were found in liver, spleen and kidneys after 50 days. B. suis biovar 1 was cultured from the lesion of the organs mentioned above as well as from urine, placenta and fetuses. These data suggest that hares are a potential source for horizontal transmission of B. suis biovar 1 to other mammalians.
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Affiliation(s)
- Marcelo Fort
- INTA-Estación Experimental Agropecuaria de Anguil, La Pampa, Argentina
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Minig M, Mazzaferro LS, Erra-Balsells R, Petroselli G, Breccia JD. α-Rhamnosyl-β-glucosidase-catalyzed reactions for analysis and biotransformations of plant-based foods. J Agric Food Chem 2011; 59:11238-11243. [PMID: 21834586 DOI: 10.1021/jf202412e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Most aroma compounds exist in vegetal tissues as disaccharide conjugates, rutinose being an abundant sugar moiety in grapes. The availability of aroma precursors would facilitate analytical analysis of plant-based foods. The diglycosidase α-rhamnosyl-β-glucosidase from Acremonium sp. DSM 24697 efficiently transglycosylated the rutinose moiety from hesperidin to 2-phenylethanol, geraniol, and nerol in an aqueous-organic biphasic system. 2-Phenethyl rutinoside was synthesized up to millimolar level with an 80% conversion regarding the donor hesperidin. The hydrolysis of the synthesized aroma precursors was not detected in an aqueous medium. However, in the presence of ethanol as a sugar acceptor, the enzyme was able to transfer the disaccharide residue forming the alkyl-rutinoside. The aroma precursors were significantly hydrolyzed (up to 3-4% in 2 h at 30 °C), which indicated the potential use of the enzyme for biotechnological applications, for example, in aroma modulation of fermented foods.
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Affiliation(s)
- Marisol Minig
- INCITAP-Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Av. Uruguay 151, (6300) Santa Rosa, La Pampa, Argentina
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19
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20
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Mazzaferro L, Breccia JD, Andersson MM, Hitzmann B, Hatti-Kaul R. Polyethyleneimine–protein interactions and implications on protein stability. Int J Biol Macromol 2010; 47:15-20. [DOI: 10.1016/j.ijbiomac.2010.04.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 04/13/2010] [Accepted: 04/14/2010] [Indexed: 10/19/2022]
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Mazzaferro L, Piñuel L, Minig M, Breccia JD. Extracellular monoenzyme deglycosylation system of 7-O-linked flavonoid beta-rutinosides and its disaccharide transglycosylation activity from Stilbella fimetaria. Arch Microbiol 2010; 192:383-93. [PMID: 20358178 DOI: 10.1007/s00203-010-0567-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 03/02/2010] [Accepted: 03/10/2010] [Indexed: 11/24/2022]
Abstract
We screened for microorganisms able to use flavonoids as a carbon source; and one isolate, nominated Stilbella fimetaria SES201, was found to possess a disaccharide-specific hydrolase. It was a cell-bound ectoenzyme that was released to the medium during conidiogenesis. The enzyme was shown to cleave the flavonoid hesperidin (hesperetin 7-O-alpha-rhamnopyranosyl-beta-glucopyranoside) into rutinose (alpha-rhamnopyranosyl-beta-glucopyranose) and hesperetin. Since only intracellular traces of monoglycosidase activities (beta-glucosidase, alpha-rhamnosidase) were produced, the disaccharidase alpha-rhamnosyl-beta-glucosidase was the main system utilized by the microorganism for hesperidin hydrolysis. The enzyme was a glycoprotein with a molecular weight of 42224 Da and isoelectric point of 5.7. Even when maximum activity was found at 70 degrees C, it was active at temperatures as low as 5 degrees C, consistent with the psychrotolerant character of S. fimetaria. Substrate preference studies indicated that the enzyme exhibits high specificity toward 7-O-linked flavonoid beta-rutinosides. It did not act on flavonoid 3-O-beta-rutinoside and 7-O-beta-neohesperidosides, neither monoglycosylated substrates. In an aqueous medium, the alpha-rhamnosyl-beta-glucosidase was also able to transfer rutinose to other acceptors besides water, indicating its potential as biocatalyst for organic synthesis. The monoenzyme strategy of Acremonium sp. SES201 = DSM 24697, [corrected] as well as the enzyme substrate preference for 7-O-beta-flavonoid rutinosides, is unique characteristics among the microbial flavonoid deglycosylation systems reported.
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Affiliation(s)
- Laura Mazzaferro
- Departamento de Química, Universidad Nacional de La Pampa, Santa Rosa, La Pampa, Argentina
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22
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Grassano AE, Ronchi AL, Garcia PG, Mazzaferro L, Breccia JD. Quantitative relationship between maximum growth rates and the intracellular pattern of alpha-esterase and beta-esterase activity of leguminous infecting bacteria. N Biotechnol 2009; 26:234-8. [PMID: 19833241 DOI: 10.1016/j.nbt.2009.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2008] [Revised: 09/08/2009] [Accepted: 10/04/2009] [Indexed: 10/20/2022]
Abstract
Sixteen strains belonging to three families of the Rhizobiales order (Bradyrhizobiaceae, Phyllobacteriaceae and Rhizobiaceae) were evaluated according their specific growth rates (micro) and the activity of intracellular alpha-esterase and beta-esterase isoenzymes. The average esterase activity of 48 isoenzymes assayed belonging to five strains with low (micro(max) = 0.08-0.12 h(-1)), four medium (micro(max) = 0.13-0.22 h(-1)) and seven high (micro(max) = 0.24-0.28 h(-1)) growth rate values were 22.1 +/- 4.3; 8.7 +/- 2.2 and 3.9 +/-1.7 U g(-1) respectively. An inversely proportional relationship between the activity of the whole pattern of esterases and micro(max) was found. Our results illustrate a feature of intracellular esterases, ascribable in a variety of cellular functions, which might be related to characteristics micro(max) of legume infecting bacteria.
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Affiliation(s)
- Alicia E Grassano
- Depto. de Química, CONICET, (FCEyN) Universidad Nacional de La Pampa (UNLPam), (6300) Santa Rosa, La Pampa, Argentina
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23
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Ledesma P, González CF, Breccia JD, Siñriz F. Zymographic assay to differentiate Lactobacillus reuteri among other Lactobacillus. ACTA ACUST UNITED AC 2006. [DOI: 10.3166/sda.26.283-287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Olivera N, Siñeriz F, Breccia JD. Bacillus patagoniensis sp. nov., a novel alkalitolerant bacterium from the rhizosphere of Atriplex lampa in Patagonia, Argentina. Int J Syst Evol Microbiol 2005; 55:443-447. [PMID: 15653916 DOI: 10.1099/ijs.0.63348-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [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: 11/18/2022] Open
Abstract
A Gram-positive, rod-shaped, spore-forming bacterium (PAT 05T) was isolated from the rhizosphere of the perennial shrub Atriplex lampa in north-eastern Patagonia, Argentina. Its overall biochemical and physiological characteristics indicated that this strain should be placed in the alkaliphilic Bacillus group. Strain PAT 05T grew at pH 7-10 (optimum pH 8), but not at pH 6. Its DNA G+C content was 39.7 mol%. Sequence analysis of the 16S rRNA gene of PAT 05T revealed the closest match (99.6 % similarity) with Bacillus sp. DSM 8714. The highest level of DNA-DNA relatedness (88.6 %) was also found with this strain. On the basis of 16S rRNA gene sequence similarity and phylogenetic analysis, G+C content and DNA-DNA hybridization data, strain PAT 05T is related at the species level to Bacillus sp. DSM 8714, a member of a group referred as phenon 4a by Nielsen et al. [Nielsen, P., Fritze, D. & Priest, F. G. (1995). Microbiology 141, 1745-1761], which still lacks taxonomic standing. These results support the proposal of strain PAT 05T (=DSM 16117T=ATCC BAA-965T) as the type strain of Bacillus patagoniensis sp. nov.
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Affiliation(s)
- Nelda Olivera
- PROIMI Planta Piloto de Procesos Industriales Microbiológicos, Av. Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Tucumán, Argentina
| | - Faustino Siñeriz
- Cátedra de Microbiología Superior, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina
- PROIMI Planta Piloto de Procesos Industriales Microbiológicos, Av. Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Tucumán, Argentina
| | - Javier D Breccia
- Cátedra de Microbiología de Alimentos, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina
- PROIMI Planta Piloto de Procesos Industriales Microbiológicos, Av. Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Tucumán, Argentina
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Martínez MA, Delgado OD, Breccia JD, Baigorí MD, Siñeriz F. Revision of the taxonomic position of the xylanolytic Bacillus sp. MIR32 reidentified as Bacillus halodurans and plasmid-mediated transformation of B. halodurans. Extremophiles 2002; 6:391-5. [PMID: 12382115 DOI: 10.1007/s00792-002-0269-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [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: 12/25/2001] [Accepted: 02/08/2002] [Indexed: 11/29/2022]
Abstract
Bacillus sp. MIR32 has been isolated using xylan as the only carbon source, and one of its xylanolytic enzymes has been extensively studied. Biochemical analysis first related this strain to Bacillus amyloliquefaciens, but further studies based on a comparison of 16S rDNA sequences, G+C content, and DNA-DNA hybridization showed that strain MIR32 should be classified as a member of the species Bacillus halodurans. This change is also supported by the typical phenotype observed and by the results of PCR amplification directed toward spacers in rDNA and tDNA genes, which were assayed and compared with those of B. halodurans DSM 497(T). Although among alkaliphilic bacilli competence development has not been experimentally demonstrated, in this work both B. halodurans MIR32 and DSM 497(T) were transformed according to a simple procedure developed in our laboratory, reaching 10(2)-10(3) stable transformants per microgram of plasmid DNA.
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Affiliation(s)
- M Alejandra Martínez
- PROIMI Planta Piloto de Procesos Industriales Microbiológicos, Av. Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Tucumán, Argentina.
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Breccia JD, Andersson MM, Hatti-Kaul R. The role of poly(ethyleneimine) in stabilization against metal-catalyzed oxidation of proteins: a case study with lactate dehydrogenase. Biochim Biophys Acta 2002; 1570:165-73. [PMID: 12020806 DOI: 10.1016/s0304-4165(02)00193-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The protection provided by poly(ethyleneimine) (PEI) to muscle lactate dehydrogenase (LDH) in metal-catalyzed oxidation (MCO) systems (CuSO(4) or FeCl(2) combined with H(2)O(2)) was studied, and comparisons were made with the chelators EDTA and desferal, respectively. The analytical chelating capacity of PEI was estimated to be around 1 mol Cu(2+)/10 mol ethyleneimine for all molecular weights of the polymer. The effect of [PEI monomer]/[metal ion] molar ratio on the oxidatively induced aggregation of LDH exhibited a similar trend as that of the other chelators; aggregation was enhanced at lower ratios and subsequently decreased until it was undetectable with increasing ratio. In contrast, the LDH activity showed a monotonic increase with increasing concentrations of the chelator. Total protection to the enzyme by PEI was provided at concentrations lower than that needed for full chelation of the copper ions, i.e. at [PEI monomer]/[Cu(2+)] ratio above 9 in case of PEI 2000, and above 7 for PEI 25000 and 2.6 x 10(6), respectively. The polymer also provided protection against oxidation in an iron-based MCO system. Hydroxyl radical formation during the MCO reaction was inhibited in the presence of PEI. The polymer of higher molecular weights also exhibited a stronger free radical scavenging effect.
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Affiliation(s)
- Javier D Breccia
- Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, Getingevagen 60, P.O. Box 124, S-221 00 Lund, Sweden
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Abstract
Oxidation is one of the major pathways for denaturation of proteins during storage, and also a potential problem in protein production, isolation and purification processes. In this study, a number of additives have been tested for their protective effects against oxidation in the presence of metal ions and hydrogen peroxide. Porcine muscle lactate dehydrogenase (LDH) was used as a model protein. Oxidation and denaturation of the enzyme were followed as activity loss, modification of certain amino acids, altered secondary structure and aggregation. Loss of activity during metal-catalysed oxidation was accompanied by structural damage of the enzyme, which was not the case during oxidation with peroxide. The best protectant during both modes of oxidation was found to be the polycation, poly(ethyleneimine) (PEI), followed by EDTA. Both chemicals also increased the enzyme's half-life during oxidation with a mixture of copper ions and hydrogen peroxide. Ammonium sulphate was an effective stabilizer during metal-catalysed oxidation, while sorbitol, sucrose and hydroxyectoine provided moderate stabilization. The ectoine was also stabilizing against oxidation with hydrogen peroxide, as was poly(ethylene glycol), whereas sorbitol enhanced the rate of enzyme inactivation. The stability of LDH towards denaturation by both oxidation and temperature was increased by addition of both PEI and sorbitol, as indicated by the melting-temperature profiles of the enzyme.
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Affiliation(s)
- M M Andersson
- Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.
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Breccia JD, Siñeriz F, Baigorí MD, Castro GR, Hatti-Kaul R. Purification and characterization of a thermostable xylanase from Bacillus amyloliquefaciens. Enzyme Microb Technol 1998. [DOI: 10.1016/s0141-0229(97)00102-6] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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