Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa
Ano de defesa: | 2008 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal Rural do Rio de Janeiro
|
Programa de Pós-Graduação: |
Programa de P?s-Gradua??o em Qu?mica
|
Departamento: |
Instituto de Ci?ncias Exatas
|
País: |
Brasil
|
Palavras-chave em Português: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://tede.ufrrj.br/jspui/handle/tede/41 |
Resumo: | In the sixth step of the shikimate pathway, catalyzed by 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), phosphoenolpyruvyl (PEP) reacts with shikimate-3-phosphate (S3P) to produce 5-enolpyruvylshikimate-3-phosphate (EPSP) and inorganic phosphate. Because the shikimate pathway is absent in animals, but is essential for plants and microrganisms, EPSPS is an interesting target for the development of efficient and safer herbicides, fungicides and bactericides. The most used herbicide in the world, glyphosate, is an EPSPS inhibitor. Literature results indicate that the EPSPS-catalyzed mechanism is composed by an addition step, which leads to a tetrahedral intermediate (TI), followed by an elimination step. However, the enzymatic mechanism is not completely understood, because experimental data obtained by different groups lead to conflicting results. In the present work, the EPSPScatalyzed reaction was studied by theoretical methods. First, an evaluation of the semiempirical method PM3 as a tool for the assignment of protonation states of histidine and lysine residues in enzymes was implemented by comparison with neutron diffraction data. The method was then applied for the assignment of lysine and histidine protonation states in EPSPS. Next, a model of the EPSPS of a plant, Oryza sativa, was constructed by means of homology modeling. The model was constructed based on the primary sequence of O. sativa EPSPS with two Escherichia coli EPSPS crystallographic structures as templates. After model construction, computational simulations of the elimination step were implemented with all active site aminoacid residues and water molecules, including the solvent effect. The results are indicative that the most probable mechanism for this reaction step involves the participation of a lysine residue (Lys432) as an acid catalyst and also of an aspartate residue (Asp334), as a basic catalyst. Additional studies with a phosphorylhydrazone synthesized by our group, which presented inhibitory activity for seed development, are indicative that the compound could interact very favorably with the O. sativa EPSPS active site. |
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Sant'Anna, Carlos Mauricio Rabello de827.232.227-72http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788569U1549.179.487-20http://lattes.cnpq.br/0243749290116482Souza, Anivaldo Xavier de2016-04-26T13:58:12Z2009-12-012008-10-17SOUZA, Anivaldo Xavier de. Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa. 2008. 159 f. Tese (Doutorado em Qu?mica Org?nica) - Instituto de Ci?ncias Exatas, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ, 2008.https://tede.ufrrj.br/jspui/handle/tede/41In the sixth step of the shikimate pathway, catalyzed by 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), phosphoenolpyruvyl (PEP) reacts with shikimate-3-phosphate (S3P) to produce 5-enolpyruvylshikimate-3-phosphate (EPSP) and inorganic phosphate. Because the shikimate pathway is absent in animals, but is essential for plants and microrganisms, EPSPS is an interesting target for the development of efficient and safer herbicides, fungicides and bactericides. The most used herbicide in the world, glyphosate, is an EPSPS inhibitor. Literature results indicate that the EPSPS-catalyzed mechanism is composed by an addition step, which leads to a tetrahedral intermediate (TI), followed by an elimination step. However, the enzymatic mechanism is not completely understood, because experimental data obtained by different groups lead to conflicting results. In the present work, the EPSPScatalyzed reaction was studied by theoretical methods. First, an evaluation of the semiempirical method PM3 as a tool for the assignment of protonation states of histidine and lysine residues in enzymes was implemented by comparison with neutron diffraction data. The method was then applied for the assignment of lysine and histidine protonation states in EPSPS. Next, a model of the EPSPS of a plant, Oryza sativa, was constructed by means of homology modeling. The model was constructed based on the primary sequence of O. sativa EPSPS with two Escherichia coli EPSPS crystallographic structures as templates. After model construction, computational simulations of the elimination step were implemented with all active site aminoacid residues and water molecules, including the solvent effect. The results are indicative that the most probable mechanism for this reaction step involves the participation of a lysine residue (Lys432) as an acid catalyst and also of an aspartate residue (Asp334), as a basic catalyst. Additional studies with a phosphorylhydrazone synthesized by our group, which presented inhibitory activity for seed development, are indicative that the compound could interact very favorably with the O. sativa EPSPS active site.Na sexta etapa de rea??o da via do chiquimato, catalisada pela enzima 5-enolpiruvilchiquimato-3-fostato sintase (EPSPS), o fosfoenolpiruvato (PEP) reage com o chiquimato-3-fosfato (S3P) formando o produto 5-enolpiruvilchiquimato-3-fostato (EPSP) com libera??o de fosfato inorg?nico. Como a rota do chiquimato est? ausente em animais, mas ? essencial para plantas e microorganismos, a enzima EPSPS tornou-se um alvo interessante para o desenvolvimento de herbicidas, fungicidas e bactericidas mais eficientes, ambientalmente mais seguros e econ?micos. O herbicida mais usado no mundo, o glifosato, ? um inibidor da EPSPS. Estudos indicam que o mecanismo da s?ntese do EPSP ? composto de uma etapa de adi??o, que forma um intermedi?rio tetra?drico (IT), seguida de uma etapa de elimina??o. Contudo, apesar de muito estudado, o mecanismo enzim?tico ainda n?o est? completamente esclarecido porque resultados experimentais obtidos por diferentes grupos levam a conclus?es contradit?rias. Neste trabalho foi estudado o mecanismo da s?ntese do EPSP por m?todos te?ricos. Inicialmente, foi realizada uma avalia??o do m?todo semi-emp?rico PM3 para a previs?o do estado de protona??o de res?duos de histidinas e lisinas em enzimas, por compara??o com os estados de protona??o obtidos por difra??o de n?utrons. O m?todo foi ent?o aplicado para prever os estados de protona??o de lisinas e histidinas localizadas no s?tio ativo da EPSPS. Foi constru?do um modelo da EPSPS de uma planta, Oryza sativa, aplicando o m?todo de modelagem por homologia. Foram usadas a seq??ncia prim?ria da EPSPS de O sativa e duas estruturas cristalogr?ficas da enzima de Escherichia coli, como moldes. Ap?s a constru??o do modelo, foram feitas simula??es computacionais da etapa de elimina??o da rea??o envolvendo todos os amino?cidos e mol?culas de ?gua do s?tio ativo, incluindo o efeito do solvente. Os resultados permitem concluir que o mecanismo mais prov?vel para essa rea??o envolve a participa??o de um res?duo de lisina (Lys432) como catalisador ?cido e de um res?duo de aspartato (Asp334), como catalisador b?sico da etapa de elimina??o. Estudos realizados com uma fosforilidrazona sintetizada por nosso grupo, e que apresentou atividade inibit?ria para o crescimento de sementes, indicam que esse composto interagiria de modo bastante favor?vel com o s?tio ativo da EPSPS de O. sativa.Made available in DSpace on 2016-04-26T13:58:12Z (GMT). No. of bitstreams: 1 2008 - Anivaldo Xavier de Souza.pdf: 2060415 bytes, checksum: 6199c1420f3402ed3f5d64681c184f3b (MD5) Previous issue date: 2008-10-17FAPERJ - Funda??o Carlos Chagas Filho de Amparo ? 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dc.title.por.fl_str_mv |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
title |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
spellingShingle |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa Souza, Anivaldo Xavier de EPSP sintase c?lculo semi-emp?rico Oryza sativa mecanismo de elimina??o Qu?mica |
title_short |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
title_full |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
title_fullStr |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
title_full_unstemmed |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
title_sort |
Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa |
author |
Souza, Anivaldo Xavier de |
author_facet |
Souza, Anivaldo Xavier de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Sant'Anna, Carlos Mauricio Rabello de |
dc.contributor.advisor1ID.fl_str_mv |
827.232.227-72 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788569U1 |
dc.contributor.authorID.fl_str_mv |
549.179.487-20 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0243749290116482 |
dc.contributor.author.fl_str_mv |
Souza, Anivaldo Xavier de |
contributor_str_mv |
Sant'Anna, Carlos Mauricio Rabello de |
dc.subject.por.fl_str_mv |
EPSP sintase c?lculo semi-emp?rico Oryza sativa mecanismo de elimina??o |
topic |
EPSP sintase c?lculo semi-emp?rico Oryza sativa mecanismo de elimina??o Qu?mica |
dc.subject.cnpq.fl_str_mv |
Qu?mica |
description |
In the sixth step of the shikimate pathway, catalyzed by 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), phosphoenolpyruvyl (PEP) reacts with shikimate-3-phosphate (S3P) to produce 5-enolpyruvylshikimate-3-phosphate (EPSP) and inorganic phosphate. Because the shikimate pathway is absent in animals, but is essential for plants and microrganisms, EPSPS is an interesting target for the development of efficient and safer herbicides, fungicides and bactericides. The most used herbicide in the world, glyphosate, is an EPSPS inhibitor. Literature results indicate that the EPSPS-catalyzed mechanism is composed by an addition step, which leads to a tetrahedral intermediate (TI), followed by an elimination step. However, the enzymatic mechanism is not completely understood, because experimental data obtained by different groups lead to conflicting results. In the present work, the EPSPScatalyzed reaction was studied by theoretical methods. First, an evaluation of the semiempirical method PM3 as a tool for the assignment of protonation states of histidine and lysine residues in enzymes was implemented by comparison with neutron diffraction data. The method was then applied for the assignment of lysine and histidine protonation states in EPSPS. Next, a model of the EPSPS of a plant, Oryza sativa, was constructed by means of homology modeling. The model was constructed based on the primary sequence of O. sativa EPSPS with two Escherichia coli EPSPS crystallographic structures as templates. After model construction, computational simulations of the elimination step were implemented with all active site aminoacid residues and water molecules, including the solvent effect. The results are indicative that the most probable mechanism for this reaction step involves the participation of a lysine residue (Lys432) as an acid catalyst and also of an aspartate residue (Asp334), as a basic catalyst. Additional studies with a phosphorylhydrazone synthesized by our group, which presented inhibitory activity for seed development, are indicative that the compound could interact very favorably with the O. sativa EPSPS active site. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008-10-17 |
dc.date.available.fl_str_mv |
2009-12-01 |
dc.date.accessioned.fl_str_mv |
2016-04-26T13:58:12Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/doctoralThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
SOUZA, Anivaldo Xavier de. Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa. 2008. 159 f. Tese (Doutorado em Qu?mica Org?nica) - Instituto de Ci?ncias Exatas, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ, 2008. |
dc.identifier.uri.fl_str_mv |
https://tede.ufrrj.br/jspui/handle/tede/41 |
identifier_str_mv |
SOUZA, Anivaldo Xavier de. Estudo te?rico de mecanismos para a etapa de elimina??o da s?ntese do 5-enolpiruvilchiquimato-3-fosfato (EPSP) catalisada pela EPSP sintase de Oryza sativa. 2008. 159 f. Tese (Doutorado em Qu?mica Org?nica) - Instituto de Ci?ncias Exatas, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ, 2008. |
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Universidade Federal Rural do Rio de Janeiro |
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Universidade Federal Rural do Rio de Janeiro |
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