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This work aims to evaluate the potential of immunization with E. coli BL21 expressing the recombinant rMSP1a and rMSP1b proteins of Anaplasma marginale. E. coli BL21 was transformed with recombinant plasmids pET102/msp1&#945; and pET101/msp1&#946;, and rMSP1a and rMSP1b were expressed after induction by IPTG. BALB/c mice were vaccinated with formolized BL21/rMSP1a and BL21/rMSP1b, and the production in mice sera of whole IgG was determined by ELISA. The mice immunized with BL21/rMSP1a showed a better humoral response for whole IgG when compared to the mice immunized with BL21/rMSP1b; these mice exhibited a small response after the second vaccination. Sera of mice immunized with BL21/rMSP1a reacted via western blot with BL21 and rMSP1a, with molecular masses varying from 70 to 105 kDa. Sera of mice immunized with BL21/rMSP1b reacted with BL21 and rMSP1b with a molecular mass of 100 kDa. These results demonstrate that BL21 containing rMSP1a and rMSP1b in the outer membrane were able to produce an immune response in mice, reinforcing its use in vaccine models against bovine anaplasmosis. Esse trabalho avaliou o potencial de imunização de Escherichia coli BL21 expressando as proteínas recombinantes rMSP1a e rMSP1b de Anaplasma marginale. A E. coli BL21 foi transformada com os plasmídios recombinantes pET102/msp1&#945; e pET101/msp1&#946; e as proteínas rMSP1a e rMSP1b foram expressas após indução com IPTG. Camundongos BALB/c foram vacinados com BL21/rMSP1a e BL21/rMSP1b formolisadas, e a produção de IgG total foi determinada pelo teste de ELISA nos soros dos camundongos imunizados. Os camundongos imunizados com a BL21/rMSP1a mostraram uma melhor resposta humoral para IgG total, comparada à resposta apresentada pelos camundongos imunizados com BL21/rMSP1b; estes camundongos exibiram uma menor resposta após a segunda vacinação. Soros de camundongos imunizados BL21/rMSP1a reagiram pelo western blot com BL21 e rMSP1a, com massa molecular variando de 70 a 105 kDa. Soro de camundongos imunizados com BL21/rMSP1b reagiram com BL21 e rMSP1b com massa molecular de 100 kDa. Esses resultados demonstram que BL21 contendo rMSP1a e rMSP1b na membrana externa foram capazes de produzir resposta imune em camundongos, reforçando o seu uso em modelos de vacina contra a anaplasmose bovina

Induced immune response of Escherichia coli BL21 expressing recombinant MSP1a and MSP1b proteins of Anaplasma marginale