Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/5817 |
Resumo: | Prostate cancer is the second most prevalent type of cancer worldwide and the sixth cancer-related death. The current applied therapies in advanced cancer stages are limited and not completely efficient. Thus, it is necessary to develop alternatives using, for example, molecular biology vanguard technologies that allow to identify genes that encode transmembrane proteins, abundantly expressed in cancer tissues. The six-transmembrane epithelial antigen of the prostate (STEAP1) was recognized as a protein presenting a structure with six transmembrane domains connected by extracellular loops. It is commonly located in plasma membrane, for example in communication junctions or even in endosomal membranes, suggesting a role as ion channel or transporter protein in intracellular communication between tumor cells. In association with its high specificity and significant expression levels in prostatic cancer tissues, STEAP1 is a promising candidate to be imposed as a therapeutic target, especially for immunotherapy. However, the impossibility of large-scale production hinders the development of structural and biointeraction studies, not only to establish the tridimensional structure of STEAP1 but also to understand its vivo behavior. Therefore, the main objectives consisted in establish the culture medium formulation and optimal fermentation conditions in order to achieve a maximum yield for the STEAP1 first loop (STEAP11-142) biosynthesis, besides access several conditions inherent to immobilized metal affinity chromatography (IMAC) to obtain considerable levels of purified peptide. The main results showed that TB medium fermentation at 37 ºC, 250 rpm and pH 7.2 over 8 hours increased the STEAP11-142 biosynthesis levels. Moreover, Triton X-100 at 1 % (v/v) demonstrated to be the most effective detergent for protein recovery. This result was validated by Western-blotting analysis which revealed a single immunoreactive band with the expected molecular weight (17-25 kDa). Concerning the purification step by IMAC, we tested two resins charged with nickel and cobalt. The results lead to a typical chromatographic profile where the target fragment was completed retained. Nevertheless, a considerable amount of heterologous proteins from Escherichia coli (E. coli) host co-eluted with the STEAP11-142 fragment, being necessary to develop an alternative elution strategy and optimize the purity of the target fractions. |
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Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancerCancro da PróstataImac.Produção de ProteínasProteínas MembranaresSteap1Domínio/Área Científica::Ciências Médicas::Ciências BiomédicasProstate cancer is the second most prevalent type of cancer worldwide and the sixth cancer-related death. The current applied therapies in advanced cancer stages are limited and not completely efficient. Thus, it is necessary to develop alternatives using, for example, molecular biology vanguard technologies that allow to identify genes that encode transmembrane proteins, abundantly expressed in cancer tissues. The six-transmembrane epithelial antigen of the prostate (STEAP1) was recognized as a protein presenting a structure with six transmembrane domains connected by extracellular loops. It is commonly located in plasma membrane, for example in communication junctions or even in endosomal membranes, suggesting a role as ion channel or transporter protein in intracellular communication between tumor cells. In association with its high specificity and significant expression levels in prostatic cancer tissues, STEAP1 is a promising candidate to be imposed as a therapeutic target, especially for immunotherapy. However, the impossibility of large-scale production hinders the development of structural and biointeraction studies, not only to establish the tridimensional structure of STEAP1 but also to understand its vivo behavior. Therefore, the main objectives consisted in establish the culture medium formulation and optimal fermentation conditions in order to achieve a maximum yield for the STEAP1 first loop (STEAP11-142) biosynthesis, besides access several conditions inherent to immobilized metal affinity chromatography (IMAC) to obtain considerable levels of purified peptide. The main results showed that TB medium fermentation at 37 ºC, 250 rpm and pH 7.2 over 8 hours increased the STEAP11-142 biosynthesis levels. Moreover, Triton X-100 at 1 % (v/v) demonstrated to be the most effective detergent for protein recovery. This result was validated by Western-blotting analysis which revealed a single immunoreactive band with the expected molecular weight (17-25 kDa). Concerning the purification step by IMAC, we tested two resins charged with nickel and cobalt. The results lead to a typical chromatographic profile where the target fragment was completed retained. Nevertheless, a considerable amount of heterologous proteins from Escherichia coli (E. coli) host co-eluted with the STEAP11-142 fragment, being necessary to develop an alternative elution strategy and optimize the purity of the target fractions.O cancro da próstata é o segundo tipo de cancro mais prevalente em todo mundo e a sexta causa de morte relacionada com a doença. As terapias atualmente aplicadas nomeadamente em estádios avançados não são completamente eficazes e apresentam diversas limitações. Por conseguinte, é necessário desenvolver alternativas recorrendo, por exemplo, a tecnologias vanguardistas que permitam identificar genes codificantes de proteínas membranares, abundantemente expressas em tecidos cancerígenos. The six-transmembrane epithelial antigen of the prostate 1 (STEAP1) é uma proteína constituída por seis domínios transmembranares interligados por loops extracelulares, geralmente localizada na membrana plasmática, como por exemplo em junções de comunicação ou mesmo em membranas endossomais, sugerindo que atua como um canal membranar ou proteína transportadora ao nível da comunicação intercelular entre células tumorais. Em associação com a elevada especificidade e níveis de expressão significativos em tecidos cancerígenos prostáticos, a STEAP1 é um candidato promissor para ser imposto como alvo terapêutico, em especial para imunoterapia. No entanto, o facto de não ser possível a sua produção em quantidades significativas impede o desenvolvimento de estudos que permitam estabelecer a estrutura tridimensional e estudar o seu comportamento in vivo. Assim, os objetivos principais consistiram em definir o meio de cultura e as condições ótimas de fermentação para obter o máximo de rentabilidade na biossíntese do primeiro loop da STEAP1 (STEAP11-142), para além de avaliar diferentes condições inerentes ao método immobilized metal affinity chromatography (IMAC), de forma a obter níveis consideráveis de péptido purificado. Os resultados demonstraram que a fermentação em meio TB a 37 ºC, 250 rpm e pH 7.2 ao longo de 8 horas aumentou os níveis de biossíntese de STEAP11-142. O detergente Triton X-100 a 1 % (v/v) provou ser o mais eficaz ao nível da recuperação proteica, resultado validado por Western-blot pela presença de uma banda única imunorreativa com o peso molecular expectável (17-25 kDa). No passo de purificação foram testadas duas resinas carregadas com níquel e cobalto. Os resultados evidenciaram um típico perfil cromatográfico, no qual a proteína alvo foi completamente retida. No entanto, uma quantidade considerável de proteínas provenientes do hospedeiro Escherichia coli (E. coli) eluíram juntamente com o fragmento STEAP11-142, sendo necessário desenvolver uma estratégia alternativa de eluição e otimizar a pureza das frações alvo.Batista, Cláudio Jorge MaiaPassarinha, Luís António PaulinouBibliorumFerreira, Jorge Daniel Barroca2018-08-28T15:55:55Z2016-6-62016-06-282016-06-28T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.6/5817TID:201771420enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-15T09:43:59Zoai:ubibliorum.ubi.pt:10400.6/5817Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:46:39.209223Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
title |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
spellingShingle |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer Ferreira, Jorge Daniel Barroca Cancro da Próstata Imac. Produção de Proteínas Proteínas Membranares Steap1 Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
title_short |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
title_full |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
title_fullStr |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
title_full_unstemmed |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
title_sort |
Isolation and purification of STEAP1 protein fragment in Escherichia coli cells: a potential target for prostate cancer |
author |
Ferreira, Jorge Daniel Barroca |
author_facet |
Ferreira, Jorge Daniel Barroca |
author_role |
author |
dc.contributor.none.fl_str_mv |
Batista, Cláudio Jorge Maia Passarinha, Luís António Paulino uBibliorum |
dc.contributor.author.fl_str_mv |
Ferreira, Jorge Daniel Barroca |
dc.subject.por.fl_str_mv |
Cancro da Próstata Imac. Produção de Proteínas Proteínas Membranares Steap1 Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
topic |
Cancro da Próstata Imac. Produção de Proteínas Proteínas Membranares Steap1 Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
description |
Prostate cancer is the second most prevalent type of cancer worldwide and the sixth cancer-related death. The current applied therapies in advanced cancer stages are limited and not completely efficient. Thus, it is necessary to develop alternatives using, for example, molecular biology vanguard technologies that allow to identify genes that encode transmembrane proteins, abundantly expressed in cancer tissues. The six-transmembrane epithelial antigen of the prostate (STEAP1) was recognized as a protein presenting a structure with six transmembrane domains connected by extracellular loops. It is commonly located in plasma membrane, for example in communication junctions or even in endosomal membranes, suggesting a role as ion channel or transporter protein in intracellular communication between tumor cells. In association with its high specificity and significant expression levels in prostatic cancer tissues, STEAP1 is a promising candidate to be imposed as a therapeutic target, especially for immunotherapy. However, the impossibility of large-scale production hinders the development of structural and biointeraction studies, not only to establish the tridimensional structure of STEAP1 but also to understand its vivo behavior. Therefore, the main objectives consisted in establish the culture medium formulation and optimal fermentation conditions in order to achieve a maximum yield for the STEAP1 first loop (STEAP11-142) biosynthesis, besides access several conditions inherent to immobilized metal affinity chromatography (IMAC) to obtain considerable levels of purified peptide. The main results showed that TB medium fermentation at 37 ºC, 250 rpm and pH 7.2 over 8 hours increased the STEAP11-142 biosynthesis levels. Moreover, Triton X-100 at 1 % (v/v) demonstrated to be the most effective detergent for protein recovery. This result was validated by Western-blotting analysis which revealed a single immunoreactive band with the expected molecular weight (17-25 kDa). Concerning the purification step by IMAC, we tested two resins charged with nickel and cobalt. The results lead to a typical chromatographic profile where the target fragment was completed retained. Nevertheless, a considerable amount of heterologous proteins from Escherichia coli (E. coli) host co-eluted with the STEAP11-142 fragment, being necessary to develop an alternative elution strategy and optimize the purity of the target fractions. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-6-6 2016-06-28 2016-06-28T00:00:00Z 2018-08-28T15:55:55Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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http://hdl.handle.net/10400.6/5817 TID:201771420 |
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