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Sun PP, Liu Y, Wang W, Song GJ, Ren YY. Regulation mechanism of magnetic field on pectinase and its preliminary application in postharvest sapodilla (Manilkara zapota). Food Chem 2023; 409:135300. [PMID: 36592602 DOI: 10.1016/j.foodchem.2022.135300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 11/26/2022] [Accepted: 12/21/2022] [Indexed: 12/25/2022]
Abstract
In this study, regulation mechanism of magnetic field on pectinase was investigated and it was preliminarily applied in postharvest sapodilla. Results indicated pectinase activity decreased by 44 % when treated by magnetic field (3 mT, 0.5 h) with kinetic parameters Vmax/Km decreasing from 0.799 to 0.366 min. The optimal temperature (48 °C) and pH (4.8) of pectinase was not altered by magnetic field but Ca2+ at 0.05 mol/L strengthened its regulation effect. Ultraviolet and fluorescence spectra suggested tyrosine and tryptophan residues in treated pectinase became more hydrophobic while opposite in phenylalanine. CO, CNH, COO- groups in pectinase were also influenced, resulting in decreased β-sheet (from 53 % to 49 %), increased random coil (from 20 % to 22 %) and β-turn content (from 27 % to 29 %). More importantly, the firmness of treated sapodilla remained 45 % of maximum at 12 days' storage. Our findings provided new insights to illustrate the role of magnetic field in fruit preservation.
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Affiliation(s)
- Peng-Peng Sun
- College of Life Science, Yangtze University, Jingzhou, Hubei 434023, PR China; Institute of Food Science and Technology, Yangtze University, Jingzhou, Hubei 434023, PR China
| | - Ying Liu
- College of Life Science, Yangtze University, Jingzhou, Hubei 434023, PR China
| | - Wei Wang
- College of Life Science, Yangtze University, Jingzhou, Hubei 434023, PR China
| | - Guo-Jun Song
- College of Life Science, Yangtze University, Jingzhou, Hubei 434023, PR China
| | - Yuan-Yuan Ren
- College of Life Science, Yangtze University, Jingzhou, Hubei 434023, PR China; Institute of Food Science and Technology, Yangtze University, Jingzhou, Hubei 434023, PR China.
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Biotechnological Potential of Araucaria angustifolia Pine Nuts Extract and the Cysteine Protease Inhibitor AaCI-2S. PLANTS 2020; 9:plants9121676. [PMID: 33266031 PMCID: PMC7760129 DOI: 10.3390/plants9121676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 11/24/2020] [Accepted: 11/25/2020] [Indexed: 01/29/2023]
Abstract
Protease inhibitors are involved in the regulation of endogenous cysteine proteases during seed development and play a defensive role because of their ability to inhibit exogenous proteases such as those present in the digestive tracts of insects. Araucaria angustifolia seeds, which can be used in human and animal feed, were investigated for their potential for the development of agricultural biotechnology and in the field of human health. In the pine nuts extract, which blocked the activities of cysteine proteases, it was detected potent insecticidal activity against termites (Nasutitermes corniger) belonging to the most abundant termite genus in tropical regions. The cysteine inhibitor (AaCI-2S) was purified by ion-exchange, size exclusion, and reversed-phase chromatography. Its functional and structural stability was confirmed by spectroscopic and circular dichroism studies, and by detection of inhibitory activity at different temperatures and pH values. Besides having activity on cysteine proteases from C. maculatus digestive tract, AaCI-2S inhibited papain, bromelain, ficin, and cathepsin L and impaired cell proliferation in gastric and prostate cancer cell lines. These properties qualify A. angustifolia seeds as a protein source with value properties of natural insecticide and to contain a protease inhibitor with the potential to be a bioactive molecule on different cancer cells.
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Garcia AF, Dyszy F, Munte CE, DeMarco R, Beltramini LM, Oliva G, Costa-Filho AJ, Araujo AP. THI1, a protein involved in the biosynthesis of thiamin in Arabidopsis thaliana: Structural analysis of THI1(A140V) mutant. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1094-103. [DOI: 10.1016/j.bbapap.2014.03.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 02/28/2014] [Accepted: 03/07/2014] [Indexed: 01/21/2023]
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Occena IV, Mojica ERE, Merca FE. Isolation and Partial Characterization of a Lectin from the Seeds of Artocarpus camansi Blanco. ACTA ACUST UNITED AC 2007. [DOI: 10.3923/ajps.2007.757.764] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Hanna ES, Roque-Barreira MC, Bernardes ES, Panunto-Castelo A, Sousa MV, Almeida IC, Brocchi M. Evidence for glycosylation on a DNA-binding protein of Salmonella enterica. Microb Cell Fact 2007; 6:11. [PMID: 17407574 PMCID: PMC1855067 DOI: 10.1186/1475-2859-6-11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2007] [Accepted: 04/02/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND All organisms living under aerobic atmosphere have powerful mechanisms that confer their macromolecules protection against oxygen reactive species. Microorganisms have developed biomolecule-protecting systems in response to starvation and/or oxidative stress, such as DNA biocrystallization with Dps (DNA-binding protein from starved cells). Dps is a protein that is produced in large amounts when the bacterial cell faces harm, which results in DNA protection. In this work, we evaluated the glycosylation in the Dps extracted from Salmonella enterica serovar Typhimurium. This Dps was purified from the crude extract as an 18-kDa protein, by means of affinity chromatography on an immobilized jacalin column. RESULTS The N-terminal sequencing of the jacalin-bound protein revealed 100% identity with the Dps of S. enterica serovar Typhimurium. Methyl-alpha-galactopyranoside inhibited the binding of Dps to jacalin in an enzyme-linked lectin assay, suggesting that the carbohydrate recognition domain (CRD) of jacalin is involved in the interaction with Dps. Furthermore, monosaccharide compositional analysis showed that Dps contained mannose, glucose, and an unknown sugar residue. Finally, jacalin-binding Dps was detected in larger amounts during the bacterial earlier growth periods, whereas high detection of total Dps was verified throughout the bacterial growth period. CONCLUSION Taken together, these results indicate that Dps undergoes post-translational modifications in the pre- and early stationary phases of bacterial growth. There is also evidence that a small mannose-containing oligosaccharide is linked to this bacterial protein.
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Affiliation(s)
- Ebert S Hanna
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil
| | - Maria-Cristina Roque-Barreira
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil
| | - Emerson S Bernardes
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil
| | - Ademilson Panunto-Castelo
- Departamento de Enfermagem Geral e Especializada, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP 14040-902, Brazil
| | - Marcelo V Sousa
- Centro Brasileiro para Pesquisas e Serviços em Proteinas, Instituto de Biologia, Universidade de Brasília, Brasília, DF 70.910-900, Brazil
| | - Igor C Almeida
- Department of Biological Sciences, University of Texas at El Paso, TX 79968-0519, USA
| | - Marcelo Brocchi
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil
- Departmento de Microbiologia e Imunologia, Instituto de Biologia, Rua Charles Darwin s/n, UNICAMP, Campinas, SP 13083-862, Brazil
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Campana PT, Moraes DI, Monteiro-Moreira ACO, Beltramini LM. Unfolding and refolding studies of frutalin, a tetrameric D-galactose binding lectin. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:753-8. [PMID: 11846776 DOI: 10.1046/j.0014-2956.2002.02742.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Protein refolding is currently a fundamental problem in biophysics and molecular biology. We have studied the refolding process of frutalin, a tetrameric lectin that presents structural homology with jacalin but shows a more marked biological activity. The initial state in our refolding puzzle was that proteins were unfolded after thermal denaturation or denaturation induced by guanidine hydrochloride, and under both conditions, frutalin was refolded. The denaturation curves, measured by fluorescence emission, gave values of conformational stability of 17.12 kJ x mol(-1) and 12.34 kJ x mol(-1), in the presence and absence of d-galactose, respectively. Native, unfolded, refolded frutalin and a distinct molecular form denoted misfolded, were separated by size-exclusion chromatography (SEC) on Superdex 75. The native and unfolded samples together with the fractions separated by SEC were also analyzed for heamagglutination activity by CD and fluorescence spectroscopy. The secondary structure content of refolded frutalin estimated from the CD spectra was found to be close to that of the native molecule. All the results obtained confirmed the successful refolding of the protein and suggested a nucleation-condensation mechanism, whereby the sugar-binding site acts as a nucleus to initiate the refolding process. The refolded monomers, after adopting their native three-dimensional structures, spontaneously assemble to form tetramers.
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Affiliation(s)
- Patricia T Campana
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brasil
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Campana PT, Moraes DI, Monteiro-Moreira AC, Beltramini LM. Unfolding and refolding studies of frutalin, a tetrameric D-galactose binding lectin. EUROPEAN JOURNAL OF BIOCHEMISTRY 2001; 268:5647-52. [PMID: 11683889 DOI: 10.1046/j.1432-1033.2001.02502.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Protein refolding is currently a fundamental problem in biophysics and molecular biology. We have studied the refolding process of frutalin, a tetrameric lectin that presents structural homology with jacalin but shows a more marked biological activity. The initial state in our refolding puzzle was that proteins were unfolded after thermal denaturation or denaturation induced by guanidine hydrochloride, and under both conditions, frutalin was refolded. The denaturation curves, measured by fluorescence emission, gave values of conformational stability of 17.12 kJ.mol-1 and 12.34 kJ.mol-1, in the presence and absence of d-galactose, respectively. Native, unfolded, refolded frutalin and a distinct molecular form denoted misfolded, were separated by size-exclusion chromatography (SEC) on Superdex 75. The native and unfolded samples together with the fractions separated by SEC were also analyzed for heamagglutination activity by CD and fluorescence spectroscopy. The secondary structure content of refolded frutalin estimated from the CD spectra was found to be close to that of the native molecule. All the results obtained confirmed the successful refolding of the protein and suggested a nucleation-condensation mechanism, whereby the sugar-binding site acts as a nucleus to initiate the refolding process. The refolded monomers, after adopting their native three-dimensional structures, spontaneously assemble to form tetramers.
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Affiliation(s)
- P T Campana
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brasil
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