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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

Estudos de Docking Molecular, síntese e atividade biológica de análogos da (-)- massoialactona e da combretastatina A-4

BARROS, Maria Ester de Sá Barreto 01 May 2015 (has links)
Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-04-04T13:49:10Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese Maria Ester Barros_CD_4.pdf: 6351675 bytes, checksum: 1634d753cabb911bd4c0cf8e58182237 (MD5) / Made available in DSpace on 2017-04-04T13:49:10Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese Maria Ester Barros_CD_4.pdf: 6351675 bytes, checksum: 1634d753cabb911bd4c0cf8e58182237 (MD5) Previous issue date: 2015-05-01 / CNPQ / A primeira parte deste trabalho envolveu o estudo de docking molecular, a síntese, e a avaliação das atividades antitumorais e anti-inflamatórias de lactonas -insaturadas, análogos estruturais da (-)-Massoialactona, produto natural com conhecida atividade farmacológica. O alvo biológico selecionado para o estudo de docking foi a CRM-1, e tal estudo revelou o potencial biológico dos análogos propostos. Estes análogos foram sintetizados em rendimentos que variaram entre 65-75%, e as suas atividades antitumoral e anti-inflamatória foram avaliadas, sendo que um deles mostrou-se bastante promissor. Estudos posteriores de docking molecular da lactona mais promissora revelou que, apesar dos isômeros R e S assumirem diferentes encaixes no sítio ativo da CRM-1, não há diferença significativa na energia de ligação entre esses isômeros e o alvo molecular estudado. A segunda etapa deste trabalho envolveu o estudo de docking molecular, a síntese, e a avaliação da atividade antitumoral de Z-estilbenos, análogos da Combretastatina A-4 (CA-4). O alvo biológico selecionado para o estudo de docking molecular foi o domínio da colchicina na tubulina. Os cálculos teóricos dos análogos estruturais propostos revelaram que seis desses compostos apresentam diferenças significativas nos valores de energia de ligação quando comparados com o valor teórico calculado para a CA-4, ou seja, teoricamente seriam mais ativos que o produto natural. Dos análogos selecionados a partir do docking molecular, dois foram sintetizados em bons rendimentos empregando-se como precursores teluretos vinílicos e organotrifluoroboratos de potássio. A posterior avaliação da atividade antitumoral dos compostos sintetizados revelou que os resultados obtidos estavam em concordância com o previsto no estudo teórico. / The first part of this work involved the study of molecular docking, synthesis, and the evaluation of anti-tumor and anti-inflammatory activities of unsaturated-lactones, structural analogues of (-)-Massoialactone, a natural product with known pharmacological activity. The biological target selected for the docking study was the CRM-1 and this study revealed the biological potential of the proposed analogues. These analogues were synthesized in yields ranging from 65-75%, and its anti-tumor and anti-inflammatory activities were evaluated, being one of them very promising. Further studies of molecular docking using the most promising lactone revealed that despite the R and S isomers take different fittings in the active site of CRM-1, there is no significant difference in binding energy between these isomers and the molecular target studied. The second step of this work involved the study of molecular docking, synthesis, and evaluation of antitumor activity of Z-stilbenes, analogues of combretastatin A-4. The biological target selected for the study of molecular docking was the domain of colchicine in tubulin. Theoretical calculations of the proposed structural analogues revealed that six of these compounds shown significant differences in binding energy values compared to the theoretical values calculated for the CA-4, ie, theoretically, the proposed compounds would be more active than the natural product. From the selected analogs proposed by molecular docking, two were synthesized in good yields employing vinyl tellurides and potassium organotrifluoroborates as precursors. Further evaluation of the antitumor activity of the synthesized compounds showed that the results were in agreement with the theoretical study.

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