Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/6758 |
Resumo: | Despite the presence of a family of defense proteins, Phaseolus vulgaris can be attacked by bruchid insects resulting in serious damage to stored grains. The two distinct active forms of α-amylase inhibitors, α-AI1 and α-AI2, in P. vulgaris show different specificity toward α-amylases. Zabrotes subfasciatus α-amylase is inhibited by α-AI2 but not by α-AI1. In contrast, porcine α-amylase is inhibited by α-AI1 but not by α-AI2. The objective of this work was to understand the molecular basis of the specificity of two inhibitors in P. vulgaris (α-AI1 and α-AI2) in relation to α-amylases. Mutants of α-AI2 were made and expressed in tobacco plants. The exhibited activity toward the mammalian α-amylase. The replacement of His33 of α-AI2 with the α-AI1-like sequence Ser-Tyr-Asn abolished inhibition of Z. subfasciatus α-amylase. From structural modeling, the conclusion is that the size and complexity of the amylase-inhibitor interface explain why mutation of the N-terminal loop and resultant abolition of Z. subfasciatus α-amylase inhibition are not accompanied by gain of inhibitory activity against porcine α-amylase. |
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Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylasesMutantes do inibidor-2 de alfa-amilase do feijão-comum para investigação da especificidade de ligação a alfa-amilasesPhaseolus vulgaris; a-amylase inhibitors; inhibitor specificity; site directed mutagenesis; structural modelingPhaseolus vulgaris; inibidores de a-amilases; especificidade de interação; mutagênese sítio-dirigida; modelagem molecularDespite the presence of a family of defense proteins, Phaseolus vulgaris can be attacked by bruchid insects resulting in serious damage to stored grains. The two distinct active forms of α-amylase inhibitors, α-AI1 and α-AI2, in P. vulgaris show different specificity toward α-amylases. Zabrotes subfasciatus α-amylase is inhibited by α-AI2 but not by α-AI1. In contrast, porcine α-amylase is inhibited by α-AI1 but not by α-AI2. The objective of this work was to understand the molecular basis of the specificity of two inhibitors in P. vulgaris (α-AI1 and α-AI2) in relation to α-amylases. Mutants of α-AI2 were made and expressed in tobacco plants. The exhibited activity toward the mammalian α-amylase. The replacement of His33 of α-AI2 with the α-AI1-like sequence Ser-Tyr-Asn abolished inhibition of Z. subfasciatus α-amylase. From structural modeling, the conclusion is that the size and complexity of the amylase-inhibitor interface explain why mutation of the N-terminal loop and resultant abolition of Z. subfasciatus α-amylase inhibition are not accompanied by gain of inhibitory activity against porcine α-amylase.Apesar de possuir uma família de proteínas de defesa, o feijão-comum (Phaseolus vulgaris L.) pode ser atacado por insetos bruquídeos causando sérios danos aos grãos armazenados. O P. vulgaris possui duas formas ativas de inibidores de a-amilases, denominadas a-AI1 e a-AI2, que apresentam diferentes especificidades em relação às a-amilases. A a-amilase de Zabrotes subfasciatus é inibida por a-AI2 mas não por a-AI1. Em contraste, a a-amilase pancreática de porco é inibida por a-AI1 mas não é por a-AI2. O objetivo deste trabalho foi entender as bases moleculares da especificidade desses inibidores em relação às a-amilases. Para tanto, foram construídos mutantes do a-AI2, os quais foram expressados em plantas de fumo. Todos os inibidores mutantes deixaram de inibir a a-amilase de inseto sem, contudo, passar a exibir atividade contra a a-amilase de mamífero. Os modelos estruturais explicam por que a substituição de His33 do a-AI2 pela seqüência correspondente do a-AI1 (Ser-Tyr-Asn) aboliu a inibição da a-amilase de Z. subfasciatus. Dos estudos de modelagem molecular pode-se concluir que o tamanho e a complexidade da interface a-amilase-inibidor explicam por que a mutação da alça N-terminal e a quebra da atividade inibitória para a-amilase de Z. subfasciatus não levam ao ganho de atividade inibitória do mutante em relação à a-amilase de porco.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária Brasileirada Silva, Maria Cristina MattarMello, Luciane VieiraCoutinho, Marise VenturaRigden, Daniel JonhNeshich, GoranChrispeels, Maarten JonhGrossi-de-Sá, Maria Fátima2004-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/6758Pesquisa Agropecuaria Brasileira; v.39, n.3, mar. 2004; 201-208Pesquisa Agropecuária Brasileira; v.39, n.3, mar. 2004; 201-2081678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/6758/3814info:eu-repo/semantics/openAccess2014-07-10T18:42:36Zoai:ojs.seer.sct.embrapa.br:article/6758Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-07-10T18:42:36Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases Mutantes do inibidor-2 de alfa-amilase do feijão-comum para investigação da especificidade de ligação a alfa-amilases |
title |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
spellingShingle |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases da Silva, Maria Cristina Mattar Phaseolus vulgaris; a-amylase inhibitors; inhibitor specificity; site directed mutagenesis; structural modeling Phaseolus vulgaris; inibidores de a-amilases; especificidade de interação; mutagênese sítio-dirigida; modelagem molecular |
title_short |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
title_full |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
title_fullStr |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
title_full_unstemmed |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
title_sort |
Mutants of common bean alpha-amylase inhibitor-2 as an approach to investigate binding specificity to alpha-amylases |
author |
da Silva, Maria Cristina Mattar |
author_facet |
da Silva, Maria Cristina Mattar Mello, Luciane Vieira Coutinho, Marise Ventura Rigden, Daniel Jonh Neshich, Goran Chrispeels, Maarten Jonh Grossi-de-Sá, Maria Fátima |
author_role |
author |
author2 |
Mello, Luciane Vieira Coutinho, Marise Ventura Rigden, Daniel Jonh Neshich, Goran Chrispeels, Maarten Jonh Grossi-de-Sá, Maria Fátima |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
da Silva, Maria Cristina Mattar Mello, Luciane Vieira Coutinho, Marise Ventura Rigden, Daniel Jonh Neshich, Goran Chrispeels, Maarten Jonh Grossi-de-Sá, Maria Fátima |
dc.subject.por.fl_str_mv |
Phaseolus vulgaris; a-amylase inhibitors; inhibitor specificity; site directed mutagenesis; structural modeling Phaseolus vulgaris; inibidores de a-amilases; especificidade de interação; mutagênese sítio-dirigida; modelagem molecular |
topic |
Phaseolus vulgaris; a-amylase inhibitors; inhibitor specificity; site directed mutagenesis; structural modeling Phaseolus vulgaris; inibidores de a-amilases; especificidade de interação; mutagênese sítio-dirigida; modelagem molecular |
description |
Despite the presence of a family of defense proteins, Phaseolus vulgaris can be attacked by bruchid insects resulting in serious damage to stored grains. The two distinct active forms of α-amylase inhibitors, α-AI1 and α-AI2, in P. vulgaris show different specificity toward α-amylases. Zabrotes subfasciatus α-amylase is inhibited by α-AI2 but not by α-AI1. In contrast, porcine α-amylase is inhibited by α-AI1 but not by α-AI2. The objective of this work was to understand the molecular basis of the specificity of two inhibitors in P. vulgaris (α-AI1 and α-AI2) in relation to α-amylases. Mutants of α-AI2 were made and expressed in tobacco plants. The exhibited activity toward the mammalian α-amylase. The replacement of His33 of α-AI2 with the α-AI1-like sequence Ser-Tyr-Asn abolished inhibition of Z. subfasciatus α-amylase. From structural modeling, the conclusion is that the size and complexity of the amylase-inhibitor interface explain why mutation of the N-terminal loop and resultant abolition of Z. subfasciatus α-amylase inhibition are not accompanied by gain of inhibitory activity against porcine α-amylase. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-03-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/6758 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/6758 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/6758/3814 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.39, n.3, mar. 2004; 201-208 Pesquisa Agropecuária Brasileira; v.39, n.3, mar. 2004; 201-208 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
_version_ |
1793416696847925248 |