{"id":185310,"date":"2025-12-04T13:26:33","date_gmt":"2025-12-04T12:26:33","guid":{"rendered":"https:\/\/www.ainia.com\/?p=185310"},"modified":"2026-04-10T09:46:24","modified_gmt":"2026-04-10T08:46:24","slug":"sintese-de-proteinas-papel-da-enzima-peptidil-transferase","status":"publish","type":"post","link":"https:\/\/www.ainia.com\/pt\/ainia-news\/sintese-de-proteinas-papel-da-enzima-peptidil-transferase\/","title":{"rendered":"S\u00edntese de prote\u00ednas: papel da enzima peptidil transferase"},"content":{"rendered":"<html><body><div class=\"wpb-content-wrapper\"><p><span data-contrast=\"none\"><span class=\"TextRun SCXW41880406 BCX8\" lang=\"ES-ES\" xml:lang=\"ES-ES\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW41880406 BCX8\"><span class=\"TextRun SCXW194446391 BCX8\" lang=\"ES-ES\" xml:lang=\"ES-ES\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW194446391 BCX8\"><span class=\"TextRun SCXW1005685 BCX8\" lang=\"ES-ES\" xml:lang=\"ES-ES\" data-contrast=\"auto\"><span class=\"NormalTextRun SpellingErrorV2Themed SCXW1005685 BCX8\">[vc_row][vc_column][vc_column_text css=\u201d\u201d]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><span data-contrast=\"auto\">A\u00a0<\/span><b><span data-contrast=\"auto\">s\u00edntese de prote\u00ednas<\/span><\/b><span data-contrast=\"auto\">\u00a0\u00e9 um dos processos metab\u00f3licos mais intensivos e finamente regulados da c\u00e9lula. No cora\u00e7\u00e3o desta maquinaria encontra-se a\u00a0<\/span><b><span data-contrast=\"auto\">enzima\u00a0peptidil\u00a0transferase<\/span><\/b><span data-contrast=\"auto\">, o centro catal\u00edtico do\u00a0ribossoma\u00a0respons\u00e1vel por criar a liga\u00e7\u00e3o pept\u00eddica que une amino\u00e1cidos e origina a cadeia polipept\u00eddica. Neste artigo revemos o que acontece durante a tradu\u00e7\u00e3o, a import\u00e2ncia desta enzima e como podemos aproveitar este conhecimento em biotecnologia e na formula\u00e7\u00e3o de ingredientes.\u00a0<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><b><span data-contrast=\"none\">O que \u00e9 a s\u00edntese de prote\u00ednas?<\/span><\/b><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"134245418\":true,\"134245529\":true,\"335559738\":299,\"335559739\":299}'>\u00a0<\/span><\/h2>\n<p><span data-contrast=\"auto\">A\u00a0<\/span><b><span data-contrast=\"auto\">s\u00edntese de prote\u00ednas<\/span><\/b><span data-contrast=\"auto\">\u00a0\u00e9 a montagem sequencial de amino\u00e1cidos num\u00a0ribossoma\u00a0a partir da informa\u00e7\u00e3o codificada num mRNA. Divide-se em tr\u00eas fases principais:<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"auto\">Inicia\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0o\u00a0ribossoma\u00a0reconhece o local de in\u00edcio no mRNA, o\u00a0<\/span><b><span data-contrast=\"auto\">tRNA\u00a0iniciador<\/span><\/b><span data-contrast=\"auto\">\u00a0posiciona-se no s\u00edtio P e estabelece-se o quadro de leitura.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Elonga\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0<\/span><b><span data-contrast=\"auto\">aminoacil-tRNAs<\/span><\/b><span data-contrast=\"auto\">\u00a0entram sequencialmente no s\u00edtio A. A\u00a0<\/span><b><span data-contrast=\"auto\">enzima\u00a0peptidil\u00a0transferase<\/span><\/b><span data-contrast=\"auto\">\u00a0catalisa a forma\u00e7\u00e3o da liga\u00e7\u00e3o pept\u00eddica entre o\u00a0p\u00e9ptido\u00a0no s\u00edtio P e o amino\u00e1cido no s\u00edtio A. Ap\u00f3s cada rea\u00e7\u00e3o, o\u00a0ribossoma\u00a0transloca\u00a0um c\u00f3don e o\u00a0p\u00e9ptido\u00a0em crescimento passa de A para P.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Termina\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0ao chegar a um c\u00f3don stop, os\u00a0<\/span><b><span data-contrast=\"auto\">fatores de liberta\u00e7\u00e3o<\/span><\/b><span data-contrast=\"auto\">\u00a0promovem a hidr\u00f3lise do\u00a0peptidil-tRNA, a prote\u00edna \u00e9 libertada e o\u00a0ribossoma\u00a0\u00e9 reciclado.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><b><span data-contrast=\"none\">Import\u00e2ncia da enzima\u00a0peptidil\u00a0transferase<\/span><\/b><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"134245418\":true,\"134245529\":true,\"335559738\":299,\"335559739\":299}'>\u00a0<\/span><\/h2>\n<p><span data-contrast=\"auto\">A\u00a0<\/span><b><span data-contrast=\"auto\">enzima\u00a0peptidil\u00a0transferase<\/span><\/b><span data-contrast=\"auto\">\u00a0corresponde a uma atividade catal\u00edtica do RNA\u00a0riboss\u00f3mico\u00a0localizada na subunidade grande. A sua fun\u00e7\u00e3o central \u00e9 formar a\u00a0<\/span><b><span data-contrast=\"auto\">liga\u00e7\u00e3o pept\u00eddica<\/span><\/b><span data-contrast=\"auto\">\u00a0por uma rea\u00e7\u00e3o de\u00a0<\/span><b><span data-contrast=\"auto\">transesterifica\u00e7\u00e3o<\/span><\/b><span data-contrast=\"auto\">\u00a0entre o grupo \u03b1-amino do aa-tRNA\u00a0no s\u00edtio A e o\u00a0carbonilo\u00a0do\u00a0peptidil-tRNA\u00a0no s\u00edtio P.\u00a0<\/span><b><span data-contrast=\"auto\">Porque\u00a0\u00e9 t\u00e3o importante neste processo?<\/span><\/b><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"auto\">Velocidade e produtividade:<\/span><\/b><span data-contrast=\"auto\">\u00a0determina a taxa de elonga\u00e7\u00e3o e, portanto, o rendimento proteico da c\u00e9lula ou do bioprocesso.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Fidelidade indireta:<\/span><\/b><span data-contrast=\"auto\">\u00a0embora o reconhecimento c\u00f3don\u2013antic\u00f3don ocorra na subunidade pequena, a geometria do\u00a0<\/span><b><span data-contrast=\"auto\">peptidyl\u00a0transferase center (PTC)<\/span><\/b><span data-contrast=\"auto\">\u00a0favorece substratos corretamente emparelhados e desencoraja intermedi\u00e1rios n\u00e3o produtivos.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Evolu\u00e7\u00e3o e universalidade:<\/span><\/b><span data-contrast=\"auto\">\u00a0a conserva\u00e7\u00e3o estrutural do PTC sublinha a sua antiguidade evolutiva e o seu papel como n\u00facleo da maquinaria de tradu\u00e7\u00e3o.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Ao otimizar esta etapa-chave da tradu\u00e7\u00e3o, aumentamos a efici\u00eancia e a qualidade na produ\u00e7\u00e3o de prote\u00ednas,\u00a0p\u00e9ptidos\u00a0e enzimas que viabilizam vias seletivas e sustent\u00e1veis para obter\u00a0<\/span><strong><a href=\"https:\/\/www.ainia.com\/pt\/ingredientes-compostos-bioativos\/\">ingredientes e compostos bioativos<\/a><\/strong><span data-contrast=\"auto\">\u00a0de alto valor.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><strong>S\u00edntese de prote\u00ednas: mecanismo catal\u00edtico\u00a0<\/strong><\/h3>\n<ol>\n<li><b><span data-contrast=\"auto\">Acomoda\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0o aa-tRNA\u00a0corretamente emparelhado no s\u00edtio A roda e posiciona-se com precis\u00e3o.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Ativa\u00e7\u00e3o\u00a0nucleof\u00edlica:<\/span><\/b><span data-contrast=\"auto\">\u00a0o grupo \u03b1-amino do aa-tRNA\u00a0no s\u00edtio A atua como\u00a0nucle\u00f3filo\u00a0e ataca o\u00a0carbonilo\u00a0do \u00e9ster no\u00a0peptidil-tRNA.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Estado de transi\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0o PTC estabiliza o intermedi\u00e1rio tetra\u00e9drico atrav\u00e9s de\u00a0<\/span><b><span data-contrast=\"auto\">redes de liga\u00e7\u00f5es de hidrog\u00e9nio<\/span><\/b><span data-contrast=\"auto\">\u00a0e\u00a0pr\u00e9-organiza\u00e7\u00e3o\u00a0est\u00e9rica;\u00a0i\u00f5es\u00a0como\u00a0<\/span><b><span data-contrast=\"auto\">Mg\u00b2\u207a<\/span><\/b><span data-contrast=\"auto\">\u00a0contribuem para a estabiliza\u00e7\u00e3o.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Resolu\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0o\u00a0p\u00e9ptido\u00a0\u00e9 transferido para o\u00a0tRNA\u00a0no s\u00edtio A, o\u00a0tRNA\u00a0desacetilado\u00a0do s\u00edtio P \u00e9 libertado e o\u00a0ribossoma\u00a0efetua a transloca\u00e7\u00e3o.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Ciclo:<\/span><\/b><span data-contrast=\"auto\">\u00a0a repeti\u00e7\u00e3o do ciclo de elonga\u00e7\u00e3o prolonga a cadeia polipept\u00eddica at\u00e9 ao c\u00f3don stop.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<\/ol>\n<h3 aria-level=\"3\"><strong>Estrutura e bases moleculares: enzima\u00a0peptidil\u00a0transferase\u00a0<\/strong><\/h3>\n<ul>\n<li><b><span data-contrast=\"auto\">Arquitetura do PTC:<\/span><\/b><span data-contrast=\"auto\">\u00a0cavidade densamente estruturada do\u00a0rRNA\u00a0onde convergem as extremidades 3\u2019 dos\u00a0tRNAs\u00a0nos s\u00edtios P e A. As\u00a0<\/span><b><span data-contrast=\"auto\">bases do\u00a0rRNA<\/span><\/b><span data-contrast=\"auto\">\u00a0definem o microambiente catal\u00edtico.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">T\u00fanel de sa\u00edda:<\/span><\/b><span data-contrast=\"auto\">\u00a0canal que conduz a cadeia nascente para o exterior; o seu microambiente influencia as\u00a0<\/span><b><span data-contrast=\"auto\">pausas\u00a0traducionais<\/span><\/b><span data-contrast=\"auto\">\u00a0e a intera\u00e7\u00e3o com\u00a0<\/span><b><span data-contrast=\"auto\">macr\u00f3lidos<\/span><\/b><span data-contrast=\"auto\">.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Conserva\u00e7\u00e3o e varia\u00e7\u00e3o:<\/span><\/b><span data-contrast=\"auto\">\u00a0a topologia do PTC \u00e9 altamente conservada entre bact\u00e9rias, arqueias, eucariotas e\u00a0ribossomas\u00a0mitocondriais;\u00a0<\/span><b><span data-contrast=\"auto\">diferen\u00e7as subtis<\/span><\/b><span data-contrast=\"auto\">\u00a0explicam a\u00a0<\/span><b><span data-contrast=\"auto\">seletividade de antibi\u00f3ticos<\/span><\/b><span data-contrast=\"auto\">\u00a0e fen\u00f3menos de\u00a0<\/span><b><span data-contrast=\"auto\">resist\u00eancia<\/span><\/b><span data-contrast=\"auto\">.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><b><span data-contrast=\"none\">Aplica\u00e7\u00f5es pr\u00e1ticas: formula\u00e7\u00e3o e processos<\/span><\/b><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"134245418\":true,\"134245529\":true,\"335559738\":299,\"335559739\":299}'>\u00a0<\/span><\/h2>\n<p><span data-contrast=\"auto\">Um controlo preciso da\u00a0<\/span><b><span data-contrast=\"auto\">s\u00edntese de prote\u00ednas<\/span><\/b><span data-contrast=\"auto\">\u00a0e, em particular, da atividade da\u00a0<\/span><b><span data-contrast=\"auto\">enzima\u00a0peptidil\u00a0transferase<\/span><\/b><span data-contrast=\"auto\">\u00a0durante a elonga\u00e7\u00e3o, tem impacto direto na\u00a0<\/span><b><span data-contrast=\"auto\">quantidade<\/span><\/b><span data-contrast=\"auto\">,\u00a0<\/span><b><span data-contrast=\"auto\">pureza<\/span><\/b><span data-contrast=\"auto\">\u00a0e\u00a0<\/span><b><span data-contrast=\"auto\">funcionalidade<\/span><\/b><span data-contrast=\"auto\">\u00a0de prote\u00ednas e\u00a0p\u00e9ptidos\u00a0usados no desenvolvimento de\u00a0<\/span><strong><a href=\"https:\/\/www.ainia.com\/pt\/ingredientes-compostos-bioativos\/\">ingredientes e compostos bioativos<\/a><\/strong><span data-contrast=\"auto\">\u00a0de alto valor.<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><span data-ccp-props='{\"134233117\":false,\"134233118\":false,\"335559738\":240,\"335559739\":240}'>\u00a0<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-large wp-image-120127\" src=\"https:\/\/www.ainia.com\/wp-content\/uploads\/2021\/11\/Cabecera_Desarrollo_ingredientes_compuestos_bioactivos_cosmetica_higiene-1024x683.jpg\" alt=\"Compuestos bioactivos\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.ainia.com\/wp-content\/uploads\/2021\/11\/Cabecera_Desarrollo_ingredientes_compuestos_bioactivos_cosmetica_higiene-1024x683.jpg 1024w, https:\/\/www.ainia.com\/wp-content\/uploads\/2021\/11\/Cabecera_Desarrollo_ingredientes_compuestos_bioactivos_cosmetica_higiene-300x200.jpg 300w, https:\/\/www.ainia.com\/wp-content\/uploads\/2021\/11\/Cabecera_Desarrollo_ingredientes_compuestos_bioactivos_cosmetica_higiene-768x512.jpg 768w, https:\/\/www.ainia.com\/wp-content\/uploads\/2021\/11\/Cabecera_Desarrollo_ingredientes_compuestos_bioactivos_cosmetica_higiene.jpg 1260w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/p>\n<p><em><strong><span class=\"NormalTextRun SCXW45575103 BCX8\">Financiado pelo programa de\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW45575103 BCX8\">apoios<\/span><span class=\"NormalTextRun SCXW45575103 BCX8\">\u00a0\u00e0\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW45575103 BCX8\">contrata\u00e7\u00e3o<\/span><span class=\"NormalTextRun SCXW45575103 BCX8\">\u00a0de\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW45575103 BCX8\">jovens<\/span><span class=\"NormalTextRun SCXW45575103 BCX8\">\u00a0especializados em\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW45575103 BCX8\">internacionaliza\u00e7\u00e3o<\/span><\/strong><\/em><\/p>\n<p><span data-contrast=\"auto\"><img decoding=\"async\" class=\"alignnone size-large wp-image-191115\" src=\"https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1-1024x109.png\" alt=\"\" width=\"1024\" height=\"109\" srcset=\"https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1-1024x109.png 1024w, https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1-300x32.png 300w, https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1-768x82.png 768w, https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1-1536x164.png 1536w, https:\/\/www.ainia.com\/wp-content\/uploads\/2026\/02\/Imagen1.png 1878w\" sizes=\"(max-width: 1024px) 100vw, 1024px\">[\/vc_column_text]<\/span><\/p>\n<\/div><\/body><\/html>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=\u201d\u201d]A\u00a0s\u00edntese de prote\u00ednas\u00a0\u00e9 um dos processos metab\u00f3licos mais intensivos e finamente regulados da c\u00e9lula. No cora\u00e7\u00e3o desta maquinaria encontra-se a\u00a0enzima\u00a0peptidil\u00a0transferase, o centro catal\u00edtico do\u00a0ribossoma\u00a0respons\u00e1vel por criar a liga\u00e7\u00e3o pept\u00eddica que une amino\u00e1cidos e origina a cadeia polipept\u00eddica. Neste artigo revemos o que acontece durante a tradu\u00e7\u00e3o, a import\u00e2ncia desta enzima e como podemos aproveitar [&hellip;]<\/p>\n","protected":false},"author":401,"featured_media":185299,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1963],"tags":[],"class_list":["post-185310","post","type-post","status-publish","format-standard","hentry","category-inovacao-tecnologica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S\u00edntese de prote\u00ednas: papel da enzima peptidil transferase<\/title>\n<meta name=\"description\" content=\"Explora a s\u00edntese de prote\u00ednas e o papel da peptidil transferase, do mecanismo \u00e0 estrutura, com aplica\u00e7\u00f5es em biotecnologia e formula\u00e7\u00e3o.\" \/>\n<meta name=\"robots\" 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