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Avalia??o de dois clones de Escherichia coli recombinante quanto ao crescimento e express?o de ant?genos de Leishmania chagasi (kmp11 e P36)Chaves, Roberta Viana Ara?jo 14 December 2009 (has links)
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Previous issue date: 2009-12-14 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Visceral leishmaniosis caused by Leishmania chagasi, also known as calazar, presented, in the period from 1990 to 2005, tax of incidence in Brazil varying between 1 and 3 cases for 100 000 inhabitants. The Northeast region that up to the year of 2000 contributed with almost 90% of the registered cases is reducing his participation in the current decade, reaching 56% in 2005. Conventional leishmaniasis treatment is costly and it shows high
toxicity, demanding more research for alternative treatments, with special interest in development of vaccines and diagnosis kits which include production of recombinant antigens by host cells. Escherichia coli has been the microorganism most studied and used as a host for recombinant protein production. Therefore, the aim of this work was to study the influence of
induction on cellular growth and to verify the type of Leishmania chagasi antigens expression (intra or extracellular) during two recombinant E. coli clones (kmp11 and P36) cultivation in rotary incubator (shaker) using three different media (2xTY, TB, FASS+EL). For that, tests were carried out using conditions established in the literature for E. coli (37?C and 200 rpm) and media supplemented with antibiotics to guarantee that only competent cells grows. First, tests were carried out without induction in order to verify the two microorganisms kinetic behavior (growth and substrate consumption) in different media. Next, the induction was
carried out through the addition of IPTG (1mM as final concentration), at the first hour of cultivation. It was observed that protein expression were intracellular for all clones and media
tested, however the highest level of expression was clearly observed by the electrophoresis band density (intensity) for 2xTY medium and kmp11 protein. Although it contains the lowest
substrate concentration, consequently, a reduced cellular concentration when compared to other media, it appeared that this medium and clone combination is the most indicated for
recombinant protein production. Therefore, the objective of this work was achieved, since the interested proteins were produced. Consequently, this result motivates new studies for
production optimization using different cultivation strategies / A leishmaniose visceral, causada pela esp?cie Leishmania chagasi, tamb?m conhecida como calazar, apresentou, no per?odo de 1990 a 2005, taxa de incid?ncia no Brasil variando entre 1 e 3 casos por 100 mil habitantes. A regi?o Nordeste, que at? o ano de 2000 contribuiu com quase 90% dos casos registrados, est? reduzindo sua participa??o na d?cada atual, chegando a 56% em 2005. O alto custo e toxicidade das drogas usadas no tratamento convencional dessa leishmaniose levaram a busca de tratamentos alternativos, com interesse especial na pesquisa e produ??o de ant?genos por microrganismos recombinantes para desenvolvimento de vacinas e kits de diagn?stico. A bact?ria Escherichia coli tem sido o microrganismo mais estudado e usado como hospedeiro para produ??o de prote?nas recombinantes. Nesse contexto, este trabalho tem como objetivo estudar a influ?ncia da indu??o no crescimento celular e a verifica??o do tipo de express?o (intra ou extracelular) de ant?genos de Leishmania chagasi atrav?s de cultivo de dois clones de E. coli recombinante (kmp11 e P36) em incubador rotativo (shaker) usando tr?s meios diferentes (2xTY, TB, FASS+EL). Para isso, foram realizados ensaios em condi??es estabelecidas na literatura para E. coli (37?C ? 200 rpm) e os meios suplementados com antibi?ticos para garantir somente o
crescimento de c?lulas competentes. Na primeira etapa, foram realizados ensaios sem indu??o a fim de se verificar o comportamento cin?tico dos dois clones (crescimento e consumo de substrato) nos diferentes meios. Na segunda etapa, a indu??o foi realizada atrav?s da adi??o de IPTG (concentra??o final de 1mM), na primeira hora de cultivo. Foi observada que a express?o das prote?nas foi intracelular para todos os clones e meios testados, entretanto o maior n?vel foi verificado nitidamente pela densidade (intensidade) da banda nos g?is de eletroforese para o meio 2xTY e prote?na kmp11. Apesar de o meio 2xTY conter uma menor concentra??o de substratos, conseq?entemente, uma concentra??o celular reduzida quando comparada aos outros meios, pareceu que esta combina??o de meio e clone ? mais indicada para produ??o das prote?nas recombinantes testadas neste trabalho. O objetivo desse trabalho foi alcan?ado j? que a prote?na de interesse foi produzida. Conseq?entemente, este resultado motiva novos estudos para otimiza??o da produ??o usando diferentes estrat?gias de cultivo
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