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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Propriedades Bioquímicas e Funcionais de uma Proteína Ligante à Quitina Purificada de Sementes de Moringa oleifera Lamarck / Biochemical and Functional Properties of Chitin-Binding Protein Purified from seeds of Moringa oleifera Lamarck

Gifoni, Juliana Menezes January 2009 (has links)
GIFONI, Juliana Menezes. Propriedades Bioquímicas e Funcionais de uma Proteína Ligante à Quitina Purificada de Sementes de Moringa oleifera Lamarck. 2009. 140 f. Tese (Doutorado em bioquímica)- Universidade Federal do Ceará, Fortaleza-CE, 2009. / Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-07-20T16:03:34Z No. of bitstreams: 1 2009_tese_jmgifoni.pdf: 8760660 bytes, checksum: 354beec73eaacf40d4940af6fcbd173a (MD5) / Approved for entry into archive by José Jairo Viana de Sousa (jairo@ufc.br) on 2016-08-02T18:20:29Z (GMT) No. of bitstreams: 1 2009_tese_jmgifoni.pdf: 8760660 bytes, checksum: 354beec73eaacf40d4940af6fcbd173a (MD5) / Made available in DSpace on 2016-08-02T18:20:29Z (GMT). No. of bitstreams: 1 2009_tese_jmgifoni.pdf: 8760660 bytes, checksum: 354beec73eaacf40d4940af6fcbd173a (MD5) Previous issue date: 2009 / Moringa oleifera Lam. is native from Northwest India, well adapted to tropical regions. From its seeds it was isolated a new chitin binding protein, Mo-CBP3, which has coagulant properties and antifungal activity against the phytopathogen Fusarium solani. Proteins were extracted from defatted seeds flour by 0.05 M Tris-HCl buffer, pH 8.0, containing 0.15 M NaCl. The average protein content of the flour was 216.44 mgP/gF. The crude extract was fractionated in albumins and globulins by dialysis and centrifugation. Albumins were concentrated by 90% ammonium sulfate saturation. This fraction was applied into a chitin column, previously equilibrated with the same buffer. An unadsorbed and two adsorbed peaks were obtained. The first adsorbed peak was eluted with 0.1 M N-acetyl-D-glucosamine (PNAG), and the second one, with 0.05 M acetic acid, pH 3.0 (PAC). PNAG was applied into a cation exchange column, Resource S, equilibrated with 0.05 M sodium acetate buffer, pH 5.2. The third peak corresponded to Mo-CBP3 – eluted with 0.5 M NaCl in equilibrium buffer. The protein content of Mo- CBP3 was 1.17 mgP/gF. It represents a final yield of 0.54% of crude extract proteins. Apparent molecular mass by SDS-PAGE was 18.0 kDa in the absence of β-ME, and 9.0 kDa, in its presence. Results suggest that Mo-CBP3 is a dimeric protein, made of identical subunits, linked by disulfide bonds. By molecular exclusion chromatography, calculated molecular mass was 14.34 kDa, pI 10.8. Mo-CBP3 is a glycoprotein with 2.5% of carbohydrates, which has not hemagglutinating or chitinase activities. Its NH2- terminal sequence was CPAIQRCCQQLRNIQPPCRCCQ, with 22 amino acids, conffirming its basic character. Mo-CBP3 was as efficient as AlK(SO4)2 in the capacity of coagulating suspended material in water. Mo-CBP3 (0.1 mg/mL) was fungicide to Fusarium solani spores. Heat treatment of the protein at 98 °C, du ring 1 h, and pre incubation with N-acetyl-D-glucosamine, did not reverse its action. Mo-CBP3 was able to retard the mycelial growth of the fungus even at the lowest tested dose of 0.05 mg/mL. Mo-CBP3 was inactive against the oomycete Pythium oligandrum, which has cellulose in spite of chitin in cell wall. Protein was also able to inhibit about 80% of medium acidification, induced by glucose, by F. solani spores, that suggests the influence of Mo-CBP3 over the proton pumps (H+ATPases) present in cellular membranes of F. solani spores. / Moringa oleifera Lam. é uma planta originária do Noroeste da Índia, bem adaptada às regiões tropicais. De suas sementes foi isolada uma nova proteína ligante à quitina, a Mo-CBP3, com propriedades coagulantes e atividade antifúngica contra o fitopatógeno Fusarium solani. As proteínas foram extraídas da farinha delipidada de sementes com o tampão Tris-HCl 0,05 M, pH 8,0, contendo NaCl 0,15 M. O teor médio de proteína da farinha correspondeu a 216,44 mgP/gF. O extrato total foi fracionado em albuminas e globulinas por diálise contra água seguida de centrifugação. As albuminas foram concentradas com sulfato de amônio a 90% de saturação. A F0-90% foi submetida à cromatografia de afinidade em coluna de quitina, previamente equilibrada com o tampão de extração. Foram obtidos um pico não retido e dois picos retidos, correspondentes às proteínas ligantes à quitina (CBP). O primeiro destes foi eluído com solução de N-acetil-D-glucosamina 0,1 M (PNAG), e o segundo, com ácido acético 0,05 M, pH 3,0 (PAC). PNAG foi aplicado em coluna de troca catiônica, Resource S, acoplada a um sistema de FPLC, equilibrada com tampão acetato de sódio 0,05 M, pH 5,2. Dos picos obtidos, o terceiro correspondeu à proteína Mo-CBP3 - eluída com 0,5 M de NaCl no tampão de equilíbrio. O teor protéico médio calculado para a proteína purificada Mo-CBP3 foi de 1,17 mgP/gF, representando um rendimento final de 0,54% das proteínas do extrato total. A massa molecular aparente por SDS-PAGE foi de 18,0 kDa sem o agente redutor e, de 9,0 kDa, na presença deste. O resultado sugere que Mo-CBP3 seja uma proteína dimérica formada de subunidades idênticas, unidas por pontes dissulfeto. A massa molecular de Mo-CBP3, por cromatografia de exclusão molecular, foi de 14,34 kDa, e o pI de 10,8. Trata-se de uma glicoproteína com 2,5% de carboidratos, que não apresenta atividade hemaglutinante ou quitinásica. Sua seqüência NH2-Terminal obtida foi CPAIQRCCQQLRNIQPPCRCCQ, com 22 aminoácidos, confirmando sua característica básica. Mo-CBP3 mostrou-se tão eficiente quanto o AlK(SO4)2 na capacidade de coagular matéria em suspensão na água. Mo-CBP3 foi fungicida para esporos de Fusarium solani a 0,1 mg/mL. O aquecimento da proteína a 98 °C, por 1 h, e a pré-incubação com o açúcar N-acetil-D-glucosamina, não reverteram sua ação. Mo-CBP3 mostrou-se capaz de retardar o crescimento micelial do fungo ainda na menor dose testada, 0,05 mg/mL. Mo-CBP3 é inativa contra o oomiceto Pythium oligandrum, que apresenta celulose no lugar da quitina na parede celular. A proteína foi, ainda, capaz de inibir cerca de 80% da acidificação do meio, por esporos de F. solani, induzida por glicose, o que sugere a influência de Mo-CBP3 sobre as bombas de prótons (H+ATPases) presentes na membrana celular dos esporos deste fungo.
2

Propriedades BioquÃmicas e Funcionais de uma ProteÃna Ligante à Quitina Purificada de Sementes de Moringa oleifera Lamarck / Biochemical and Functional Properties of Chitin-Binding Protein Purified from seeds of Moringa oleifera Lamarck

Juliana Menezes Gifoni 10 December 2009 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Moringa oleifera Lam. à uma planta originÃria do Noroeste da Ãndia, bem adaptada Ãs regiÃes tropicais. De suas sementes foi isolada uma nova proteÃna ligante à quitina, a Mo-CBP3, com propriedades coagulantes e atividade antifÃngica contra o fitopatÃgeno Fusarium solani. As proteÃnas foram extraÃdas da farinha delipidada de sementes com o tampÃo Tris-HCl 0,05 M, pH 8,0, contendo NaCl 0,15 M. O teor mÃdio de proteÃna da farinha correspondeu a 216,44 mgP/gF. O extrato total foi fracionado em albuminas e globulinas por diÃlise contra Ãgua seguida de centrifugaÃÃo. As albuminas foram concentradas com sulfato de amÃnio a 90% de saturaÃÃo. A F0-90% foi submetida à cromatografia de afinidade em coluna de quitina, previamente equilibrada com o tampÃo de extraÃÃo. Foram obtidos um pico nÃo retido e dois picos retidos, correspondentes Ãs proteÃnas ligantes à quitina (CBP). O primeiro destes foi eluÃdo com soluÃÃo de N-acetil-D-glucosamina 0,1 M (PNAG), e o segundo, com Ãcido acÃtico 0,05 M, pH 3,0 (PAC). PNAG foi aplicado em coluna de troca catiÃnica, Resource S, acoplada a um sistema de FPLC, equilibrada com tampÃo acetato de sÃdio 0,05 M, pH 5,2. Dos picos obtidos, o terceiro correspondeu à proteÃna Mo-CBP3 - eluÃda com 0,5 M de NaCl no tampÃo de equilÃbrio. O teor protÃico mÃdio calculado para a proteÃna purificada Mo-CBP3 foi de 1,17 mgP/gF, representando um rendimento final de 0,54% das proteÃnas do extrato total. A massa molecular aparente por SDS-PAGE foi de 18,0 kDa sem o agente redutor e, de 9,0 kDa, na presenÃa deste. O resultado sugere que Mo-CBP3 seja uma proteÃna dimÃrica formada de subunidades idÃnticas, unidas por pontes dissulfeto. A massa molecular de Mo-CBP3, por cromatografia de exclusÃo molecular, foi de 14,34 kDa, e o pI de 10,8. Trata-se de uma glicoproteÃna com 2,5% de carboidratos, que nÃo apresenta atividade hemaglutinante ou quitinÃsica. Sua seqÃÃncia NH2-Terminal obtida foi CPAIQRCCQQLRNIQPPCRCCQ, com 22 aminoÃcidos, confirmando sua caracterÃstica bÃsica. Mo-CBP3 mostrou-se tÃo eficiente quanto o AlK(SO4)2 na capacidade de coagular matÃria em suspensÃo na Ãgua. Mo-CBP3 foi fungicida para esporos de Fusarium solani a 0,1 mg/mL. O aquecimento da proteÃna a 98 ÂC, por 1 h, e a prÃ-incubaÃÃo com o aÃÃcar N-acetil-D-glucosamina, nÃo reverteram sua aÃÃo. Mo-CBP3 mostrou-se capaz de retardar o crescimento micelial do fungo ainda na menor dose testada, 0,05 mg/mL. Mo-CBP3 à inativa contra o oomiceto Pythium oligandrum, que apresenta celulose no lugar da quitina na parede celular. A proteÃna foi, ainda, capaz de inibir cerca de 80% da acidificaÃÃo do meio, por esporos de F. solani, induzida por glicose, o que sugere a influÃncia de Mo-CBP3 sobre as bombas de prÃtons (H+ATPases) presentes na membrana celular dos esporos deste fungo. / Moringa oleifera Lam. is native from Northwest India, well adapted to tropical regions. From its seeds it was isolated a new chitin binding protein, Mo-CBP3, which has coagulant properties and antifungal activity against the phytopathogen Fusarium solani. Proteins were extracted from defatted seeds flour by 0.05 M Tris-HCl buffer, pH 8.0, containing 0.15 M NaCl. The average protein content of the flour was 216.44 mgP/gF. The crude extract was fractionated in albumins and globulins by dialysis and centrifugation. Albumins were concentrated by 90% ammonium sulfate saturation. This fraction was applied into a chitin column, previously equilibrated with the same buffer. An unadsorbed and two adsorbed peaks were obtained. The first adsorbed peak was eluted with 0.1 M N-acetyl-D-glucosamine (PNAG), and the second one, with 0.05 M acetic acid, pH 3.0 (PAC). PNAG was applied into a cation exchange column, Resource S, equilibrated with 0.05 M sodium acetate buffer, pH 5.2. The third peak corresponded to Mo-CBP3 â eluted with 0.5 M NaCl in equilibrium buffer. The protein content of Mo- CBP3 was 1.17 mgP/gF. It represents a final yield of 0.54% of crude extract proteins. Apparent molecular mass by SDS-PAGE was 18.0 kDa in the absence of β-ME, and 9.0 kDa, in its presence. Results suggest that Mo-CBP3 is a dimeric protein, made of identical subunits, linked by disulfide bonds. By molecular exclusion chromatography, calculated molecular mass was 14.34 kDa, pI 10.8. Mo-CBP3 is a glycoprotein with 2.5% of carbohydrates, which has not hemagglutinating or chitinase activities. Its NH2- terminal sequence was CPAIQRCCQQLRNIQPPCRCCQ, with 22 amino acids, conffirming its basic character. Mo-CBP3 was as efficient as AlK(SO4)2 in the capacity of coagulating suspended material in water. Mo-CBP3 (0.1 mg/mL) was fungicide to Fusarium solani spores. Heat treatment of the protein at 98 ÂC, du ring 1 h, and pre incubation with N-acetyl-D-glucosamine, did not reverse its action. Mo-CBP3 was able to retard the mycelial growth of the fungus even at the lowest tested dose of 0.05 mg/mL. Mo-CBP3 was inactive against the oomycete Pythium oligandrum, which has cellulose in spite of chitin in cell wall. Protein was also able to inhibit about 80% of medium acidification, induced by glucose, by F. solani spores, that suggests the influence of Mo-CBP3 over the proton pumps (H+ATPases) present in cellular membranes of F. solani spores.

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