Submitted by Kelson Anthony de Menezes (kelson@ucb.br) on 2016-12-19T19:37:39Z No. of bitstreams: 1 FabiodeBarrosAmaralDissertacao2014.pdf: 2938215 bytes, checksum: 3d899bf568eeae36d21979ba7aafab3c (MD5) / Made available in DSpace on 2016-12-19T19:37:39Z (GMT). No. of bitstreams: 1 FabiodeBarrosAmaralDissertacao2014.pdf: 2938215 bytes, checksum: 3d899bf568eeae36d21979ba7aafab3c (MD5) Previous issue date: 2014-03-31 / The equine chorionic gonadotropin (eCG) has been used as an important resource in the processes of reproduction in animals of economic interest, especially horses and cattle. The eCG molecule consists of a glycoprotein composed of two subunits called alpha and beta which together perform the function of both LH (luteinizing hormone) and FSH (follicle stimulating hormone) and due to this characteristic has great potential to induce ovulation in household species. Based on the aforementioned characteristics, the present work was was aimed at the study and characterization of the structure of eCG using molecular modeling techniques as well as testing its production in cells of the microorganism Pichia pastoris. Furthermore, chimeric models have been proposed linking the eCG and immunoglobulin G (IgG) molecule based on studies that reveal the great potential of it in raising the half-life of other molecules circulating in the organism. Four chimeric models were prepared so that the eCG alpha and beta chains are connected by a hinge, short and flexible regions, while the terminal region of the alpha chain was connected to the N-terminal portion of the CH2 domain of the IgG by another hinge region, thus resulting in a model in which two different molecules are linked. / A gonadotrofina cori??nica equina (eCG) tem sido um importante recurso usado nos processos de reprodu????o em animais de interesse econ??mico, principalmente equinos e bovinos. A mol??cula de eCG consiste em uma glicoprote??na composta de duas subunidades denominadas alfa e beta que juntas desempenham a fun????o tanto de LH (horm??nio luteinizante) como FSH (horm??nio fol??culo estimulante) e devido a essa caracter??stica possui um grande potencial para induzir a ovula????o em esp??cies dom??sticas. Baseando-se nas caracter??sticas citadas, o presente trabalho teve como objetivo estudar e caracterizar a estrutura do eCG utilizando-se t??cnicas de modelagem molecular assim como testar a sua produ????o em c??lulas do microrganismo Pichia pastoris. Al??m disso, foram propostos modelos quim??ricos ligando eCG ?? mol??cula de imunoglobulina G (IgG) tendo como base estudos que revelam o grande potencial da mesma em elevar a meia vida de outras mol??culas em circula????o no organismo. Quatro modelos quim??ricos foram apresentados de forma que as cadeias beta e alfa do eCG s??o conectadas por regi??es hinge que s??o sequ??ncias curtas e flex??veis da mol??cula enquanto que a regi??o terminal da cadeia alfa foi conectada por meio de outra regi??o hinge, ?? por????o N-terminal do dom??nio CH2 da IgG, portanto, resultando em um modelo em que est??o ligadas duas mol??culas diferentes.