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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

Isolamento em cromatografia de imunoafinidade e atividade antifúngica de osmotinas de fluidos laticíferos / Insulation immunoaffinity chromatography and antifungal activity osmotinas of latex fluid

Silva, Maria Zelandia Rocha January 2015 (has links)
SILVA, Maria Zelandia Rocha. Isolamento em cromatografia de imunoafinidade e atividade antifúngica de osmotinas de fluidos laticíferos. 2015. 85 f. Dissertação (Mestrado em bioquímica)- Universidade Federal do Ceará, Fortaleza-CE, 2015. / Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-09-01T19:36:22Z No. of bitstreams: 1 2015_dis_mzrsilva.pdf: 2515574 bytes, checksum: 4dcf1607c0ce726fde9bddf9f92b2d80 (MD5) / Approved for entry into archive by Jairo Viana (jairo@ufc.br) on 2016-09-02T20:25:43Z (GMT) No. of bitstreams: 1 2015_dis_mzrsilva.pdf: 2515574 bytes, checksum: 4dcf1607c0ce726fde9bddf9f92b2d80 (MD5) / Made available in DSpace on 2016-09-02T20:25:44Z (GMT). No. of bitstreams: 1 2015_dis_mzrsilva.pdf: 2515574 bytes, checksum: 4dcf1607c0ce726fde9bddf9f92b2d80 (MD5) Previous issue date: 2015 / Plants are constantly exposed to a variety of stresses conditions. However, they react to biotic stresses by triggering a set of defense mechanisms including the synthesis of defensive substances as the pathogenesis-related (PR) proteins. The PR-protein named osmotin can be induced under osmotic stress and water shortage conditions. Osmotin-like proteins have been purified from latex and some of them are related to antifungal activity. The aim of this study was to investigate the osmotin in the following species laticifers: C. grandiflora, P. rubra, T. peruviana, H. drasticus and C. papaya to isolate and evaluate its antifungal activities. Immunoaffinity column chromatography with anti-CpOsm antibodies were performed in order to purify these osmotin-like. They were detected in latex of C. grandiflora and P. rubra by immunoassays the ELISA, Dot Blot and Western Blot using anti-CpOsm antibody (the osmotin of C. procera latex). Osmotin of C. procera, C. grandiflora, P. rubra and H. drasticus were identified by mass spectrometry. However, the osmotin from C. procera was co-purified with cysteine proteases. The co-purified cysteine protease from C. procera was identified as Procerain B. The alignment and the 3-D structure analysis of Procerain B and CpOsm revealed the presence of a similar sequence in both proteins. This sequence might be an epitope which allows the anti-antibody recognition. The osmotin from C. grandiflora, and P. rubra did not show antifungal activity against Fusarium solani and Colletotrichum gloesporioides. Since no correlation between the antifungal activity and the presence of these osmotins were found, the proteolytic activities of these latex protein fractions were evaluated in order to correlate with the antifungal activity C. procera and C. grandiflora showed a strong proteolytic activity. In latex, the cysteine proteases are more often related to antifungal activity than osmotin, which might explain, at least in part, the antifungal activity performed by C. grandifora and not for its osmotin. Further studies on the role of osmotin in physiology laticifers plants are needed. / As plantas estão constantemente sujeitas a diversos tipos de estresse, tanto bióticos como abióticos, resultando em respostas de defesa. Decorrente disto, os vegetais sintetizam certas proteínas denominadas de proteínas relacionadas à patogênese (PR proteína). As Pr-proteínas chamadas de osmotinas podem ser induzidas sob condições de estresse osmótico, frio e escassez de água. Osmotinas tem sido purificadas de fluidos laticíferos e algumas delas estão relacionadas com a atividade antifúngica. O objetivo do presente trabalho foi prospectar osmotinas, bem como isolá- las e avaliar suas atividades antifúngicas, nos fluidos laticíferos das seguintes espécies: C. grandiflora, P. rubra, T. peruviana, H. drasticus e C. papaya. Nos látex de C. grandiflora e P. rubra foram detectadas osmotinas através de imunoensaios em placa de ELISA, Dot Blot e Westen Blot, utilizando os anticorpos anti-CpOsm (osmotina do látex de C. procera). Cromatografia de imunoafinidade em coluna com anticorpos anti-CpOsm foram realizadas com o intuito de purificar estas osmotinas. Análises por meio de espectrometria de massas, revelaram a presença de osmotina em C. procera, C. grandiflora, P. rubra e H. drasticus. No entanto, a osmotina de C. procera foram co-purificadas com proteases cisteínicas. A protease cisteínica co- purificada no látex de C. procera foi identificada como Proceraina B. O alinhamento e a análise da estrutura tridimensional da Proceraina B e CpOsm revelaram a presença de uma sequência semelhante em ambas as proteínas, que pode ser um epítopo disponível ao reconhecimento do anticorpo anti-CpOsm. As osmotinas isoladas de C. grandiflora e P. rubra não apresentaram atividade antifúngica contra F. solani e C. gloesporioides. Desde que não houve correlação entre a atividade antifúngica e à presença destas osmotinas, as atividades proteolíticas das frações proteicas foram avaliadas a fim de correlaciona-las à atividade antifúngica. Nos fluidos laticíferos, as proteases cisteínicas estão mais frequentemente relacionadas à atividade antifúngica do que as osmotinas. Estudos mais aprofundados sobre a função das osmotinas na fisiologia de plantas laticíferas são necessários.
2

Insulation immunoaffinity chromatography and antifungal activity osmotinas of latex fluid / Isolamento em cromatografia de imunoafinidade e atividade antifÃngica de osmotinas de fluidos laticÃferos

Maria Zelandia Rocha Silva 23 February 2015 (has links)
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / Plants are constantly exposed to a variety of stresses conditions. However, they react to biotic stresses by triggering a set of defense mechanisms including the synthesis of defensive substances as the pathogenesis-related (PR) proteins. The PR-protein named osmotin can be induced under osmotic stress and water shortage conditions. Osmotin-like proteins have been purified from latex and some of them are related to antifungal activity. The aim of this study was to investigate the osmotin in the following species laticifers: C. grandiflora, P. rubra, T. peruviana, H. drasticus and C. papaya to isolate and evaluate its antifungal activities. Immunoaffinity column chromatography with anti-CpOsm antibodies were performed in order to purify these osmotin-like. They were detected in latex of C. grandiflora and P. rubra by immunoassays the ELISA, Dot Blot and Western Blot using anti-CpOsm antibody (the osmotin of C. procera latex). Osmotin of C. procera, C. grandiflora, P. rubra and H. drasticus were identified by mass spectrometry. However, the osmotin from C. procera was co-purified with cysteine proteases. The co-purified cysteine protease from C. procera was identified as Procerain B. The alignment and the 3-D structure analysis of Procerain B and CpOsm revealed the presence of a similar sequence in both proteins. This sequence might be an epitope which allows the anti-antibody recognition. The osmotin from C. grandiflora, and P. rubra did not show antifungal activity against Fusarium solani and Colletotrichum gloesporioides. Since no correlation between the antifungal activity and the presence of these osmotins were found, the proteolytic activities of these latex protein fractions were evaluated in order to correlate with the antifungal activity C. procera and C. grandiflora showed a strong proteolytic activity. In latex, the cysteine proteases are more often related to antifungal activity than osmotin, which might explain, at least in part, the antifungal activity performed by C. grandifora and not for its osmotin. Further studies on the role of osmotin in physiology laticifers plants are needed. / As plantas estÃo constantemente sujeitas a diversos tipos de estresse, tanto biÃticos como abiÃticos, resultando em respostas de defesa. Decorrente disto, os vegetais sintetizam certas proteÃnas denominadas de proteÃnas relacionadas à patogÃnese (PR proteÃna). As Pr-proteÃnas chamadas de osmotinas podem ser induzidas sob condiÃÃes de estresse osmÃtico, frio e escassez de Ãgua. Osmotinas tem sido purificadas de fluidos laticÃferos e algumas delas estÃo relacionadas com a atividade antifÃngica. O objetivo do presente trabalho foi prospectar osmotinas, bem como isolÃ- las e avaliar suas atividades antifÃngicas, nos fluidos laticÃferos das seguintes espÃcies: C. grandiflora, P. rubra, T. peruviana, H. drasticus e C. papaya. Nos lÃtex de C. grandiflora e P. rubra foram detectadas osmotinas atravÃs de imunoensaios em placa de ELISA, Dot Blot e Westen Blot, utilizando os anticorpos anti-CpOsm (osmotina do lÃtex de C. procera). Cromatografia de imunoafinidade em coluna com anticorpos anti-CpOsm foram realizadas com o intuito de purificar estas osmotinas. AnÃlises por meio de espectrometria de massas, revelaram a presenÃa de osmotina em C. procera, C. grandiflora, P. rubra e H. drasticus. No entanto, a osmotina de C. procera foram co-purificadas com proteases cisteÃnicas. A protease cisteÃnica co- purificada no lÃtex de C. procera foi identificada como Proceraina B. O alinhamento e a anÃlise da estrutura tridimensional da Proceraina B e CpOsm revelaram a presenÃa de uma sequÃncia semelhante em ambas as proteÃnas, que pode ser um epÃtopo disponÃvel ao reconhecimento do anticorpo anti-CpOsm. As osmotinas isoladas de C. grandiflora e P. rubra nÃo apresentaram atividade antifÃngica contra F. solani e C. gloesporioides. Desde que nÃo houve correlaÃÃo entre a atividade antifÃngica e à presenÃa destas osmotinas, as atividades proteolÃticas das fraÃÃes proteicas foram avaliadas a fim de correlaciona-las à atividade antifÃngica. Nos fluidos laticÃferos, as proteases cisteÃnicas estÃo mais frequentemente relacionadas à atividade antifÃngica do que as osmotinas. Estudos mais aprofundados sobre a funÃÃo das osmotinas na fisiologia de plantas laticÃferas sÃo necessÃrios.

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