Submitted by Verena Bastos (verena@uefs.br) on 2015-09-21T13:18:11Z No. of bitstreams: 1 DISSERTACAO FINAL ALINE THOMAZ.pdf: 1680438 bytes, checksum: 85bf2d7886a394df745618b6fd50d435 (MD5) / Made available in DSpace on 2015-09-21T13:18:11Z (GMT). No. of bitstreams: 1 DISSERTACAO FINAL ALINE THOMAZ.pdf: 1680438 bytes, checksum: 85bf2d7886a394df745618b6fd50d435 (MD5) Previous issue date: 2015-09-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The vitamin D receptor (VDR) is a cytoplasmic transcription factor and when activated by its ligand, translocates to the nucleus and interacts with DNA in the promoter regions with which has affinity, acting as a modulator of gene transcription and thereby producing multiple biological effects. Its main activities are the regulation and maintenance of plasma levels of calcium and phosphorus, as well as presenting immunomodulatory activities, such as the suppression of T cell activation, formation of secretion patterns of cytokines, modulation of proliferation and interference in the apoptosis. So this receptor is an important target for drugs that can help in the discovery of new immunomodulators. The present work had the objective to produce the recombinant vitamin D receptor in its soluble form for conducting future assays of drug screening of potential immunomodulators and drug-receptor interaction studies. For this, we used initially Escherichia coli expression system transformed with the plasmid HS_VDR_EC1-PQE T7, but it was only possible to obtain the protein in the insoluble fraction, even varying the temperature, time of induction and IPTG concentration. In an attempt to obtain soluble VDR, we used a eukaryotic expression system in insect cells using the baculovirus as a vector. It was built a vector, pFASTBacHT_VDR, which had the sequence of this protein cloned from pCMX.VDR. From there, it was possible to obtain recombinant bacmids used in transfection of insect cells, generating recombinant baculovirus, to then proceed with the expression of VDR. / O receptor de vitamina D (VDR) ? um fator de transcri??o g?nica citoplasm?tico e, quando ativado pelo seu ligante, transloca-se para o n?cleo e interage com regi?es promotoras no DNA com a qual apresenta afinidade, atuando como fator modulador da transcri??o g?nica e assim produzindo m?ltiplos efeitos biol?gicos. Suas principais atividades s?o a regula??o e a manuten??o dos n?veis plasm?ticos de c?lcio e f?sforo, e apresenta atividades imunomoduladoras, como a supress?o da ativa??o de c?lulas T, forma??o de padr?es de secre??o de citocinas, a modula??o da prolifera??o e interfer?ncia na apoptose. Sendo assim, esse receptor representa um importante alvo de drogas que pode contribuir na descoberta de novos f?rmacos com a??o imunomoduladora. O presente trabalho teve, como objetivo, produzir o VDR recombinante na forma sol?vel para a realiza??o de futuros ensaios de triagem de potenciais drogas com a??o imunomoduladora e estudos de intera??o droga-receptor. Para isso, foi utilizado, inicialmente, o sistema de express?o em Escherichia coli, utilizando o plasm?deo HS_VDR_EC1-PQE T7, por?m s? foi poss?vel obter a prote?na na fra??o insol?vel, mesmo variando a temperatura, o tempo de indu??o e a concentra??o de IPTG. Na tentativa de obter o VDR sol?vel, foi utilizado um sistema de express?o eucari?tico em c?lulas de inseto, utilizando como vetor o baculov?rus. Foi constru?do um vetor pFASTBacHT_VDR, o qual teve a sequ?ncia desta prote?na clonada a partir do pCMX.VDR. A partir da?, foi poss?vel obter bacm?deos recombinantes, utilizados na transfec??o de c?lulas de inseto, gerando baculov?rus recombinantes, para, ent?o, seguir com a express?o do VDR.