{"id":1693,"date":"2021-07-28T11:53:24","date_gmt":"2021-07-28T09:53:24","guid":{"rendered":"http:\/\/thibault-svt.fr\/?page_id=1693"},"modified":"2021-07-28T18:21:01","modified_gmt":"2021-07-28T16:21:01","slug":"chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme","status":"publish","type":"page","link":"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/","title":{"rendered":"CHAPITRE 1 \u2013 Les enzymes, des prot\u00e9ines catalytiques essentielles au m\u00e9tabolisme"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #bf1177;\"><strong><u>INTRODUCTION<\/u><\/strong><\/span><\/p>\n<p>L&rsquo;organisme et chacune de ses cellules fonctionne gr\u00e2ce \u00e0 des r\u00e9actions chimiques dont l&rsquo;ensemble forme le <strong>m\u00e9tabolisme.<\/strong><br \/>\nLes m\u00e9tabolismes varient d\u2019une cellule \u00e0 une autre, notamment en fonction des adaptations de la structure des cellules (leur forme, leurs organites et les mol\u00e9cules qu\u2019elles poss\u00e8dent)<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Comment ces r\u00e9actions chimiques se d\u00e9roulent-elles ? <\/strong><\/li>\n<li><strong>Comment expliquer les diff\u00e9rences de m\u00e9tabolisme d&rsquo;une esp\u00e8ce \u00e0 l&rsquo;autre et m\u00eame d&rsquo;un individu \u00e0 l&rsquo;autre ?<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #bf1177;\"><strong><u>I- Le fonctionnement des enzymes<\/u> <\/strong><\/span><\/p>\n<p><span style=\"text-decoration: underline; color: #3366ff;\"><strong>A-     Les enzymes, des catalyseurs efficaces<\/strong><\/span><\/p>\n<div class=\"titre-TP\"><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/TP1-Etude-dune-reaction-catalysee-par-une-enzyme.pdf\" target=\"_blank\" rel=\"noopener\">TP1 \u2013 Etude d\u2019une r\u00e9action catalys\u00e9e par une enzyme <\/a><\/span><\/div>\n<p>&nbsp;<\/p>\n<p>Les<strong> enzymes <\/strong>sont des mol\u00e9cules de la famille des<strong> prot\u00e9ines<\/strong>, qui <strong>catalysent des r\u00e9actions chimiques<\/strong> normalement trop lentes pour \u00eatre compatibles avec la vie. Catalyser signifie qu\u2019elles acc\u00e9l\u00e8rent les r\u00e9actions chimiques, sans en modifier le bilan. Les enzymes ne sont pas modifi\u00e9es par la r\u00e9action.<\/p>\n<p>Comme toutes les prot\u00e9ines, ce sont des assemblages (= s\u00e9quences) de mol\u00e9cules plus petites<strong> :  les acides amin\u00e9s.<\/strong><br \/>\nCette chaine d\u2019acide amin\u00e9s est repli\u00e9e de mani\u00e8re particuli\u00e8re pour chaque prot\u00e9ine, ce qui donne \u00e0 chaque prot\u00e9ine <strong>une forme tridimensionnelle sp\u00e9cifique<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1805\" src=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg\" alt=\"\" width=\"624\" height=\"395\" srcset=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg 768w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine-300x190.jpg 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Chez les enzymes, la forme 3D forme une \u00ab poche \u00bb, appel\u00e9e <strong>site actif<\/strong> constitu\u00e9e de quelques acides amin\u00e9s, dans laquelle vient se fixer le r\u00e9actif de la r\u00e9action catalys\u00e9e, qu\u2019on appelle <strong>le substrat<\/strong>.<br \/>\n<em>Plus pr\u00e9cis\u00e9ment le substrat se fixe sur les quelques acides amin\u00e9s formant le site de fixation du site actif<\/em><strong><br \/>\n<\/strong>La liaison du substrat au site actif forme un <strong>complexe enzyme-substrat.<\/strong><\/p>\n<p>D&rsquo;autres acides amin\u00e9s du site actif <em>(le site catalytique du site actif) <\/em>vont permettre la r\u00e9alisation de la r\u00e9action chimique <strong>: le substrat est transform\u00e9 en produits<\/strong>, qui se s\u00e9parent rapidement de l&rsquo;enzyme.<br \/>\n<strong>L&rsquo;enzyme n&rsquo;est pas modifi\u00e9e<\/strong> et peut \u00e0 nouveau agir sur une autre mol\u00e9cule de substrat.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff00ff;\"><strong><u>Sch\u00e9ma du m\u00e9canisme de la catalyse enzymatique<\/u><\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1804\" src=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique.png\" alt=\"\" width=\"959\" height=\"241\" srcset=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique.png 1737w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-300x75.png 300w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-1024x258.png 1024w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-768x193.png 768w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-1536x386.png 1536w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-900x226.png 900w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Catalyse-enzymatique-1280x322.png 1280w\" sizes=\"auto, (max-width: 959px) 100vw, 959px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Ces r\u00e9actions chimiques se d\u00e9roulent dans des conditions de temp\u00e9rature compatibles avec la vie (on dit que les enzymes sont <strong>des biocatalyseurs<\/strong>)<\/p>\n<p><span style=\"text-decoration: underline; color: #3366ff;\"><strong>B-     Les enzymes, des catalyseurs sp\u00e9cifiques<\/strong><\/span><\/p>\n<div class=\"titre-TP\"><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/TP1-Etude-dune-reaction-catalysee-par-une-enzyme.pdf\" target=\"_blank\" rel=\"noopener\"> TP 2 : La double-sp\u00e9cificit\u00e9 des enzymes<\/a> + <a style=\"color: #000000;\" href=\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/1spe-th1ch1-correction-tp2\/\" target=\"_blank\" rel=\"noopener\">Correction du TP 2<\/a><\/span><\/div>\n<p>Du fait de leur structure 3D et des acides amin\u00e9s qui composent leur site actif<strong>, chaque enzyme ne peut fixer qu&rsquo;un seul type de substrat<\/strong> : Les enzymes sont donc sp\u00e9cifiques \u00e0 un seul substrat.<\/p>\n<p>De plus, <strong>les enzymes ne peuvent r\u00e9aliser qu&rsquo;une seule r\u00e9action chimique<\/strong> : elles ont donc une sp\u00e9cificit\u00e9 d\u2019action.<br \/>\nDeux enzymes diff\u00e9rentes agissant sur le m\u00eame substrat donneront donc obligatoirement des produits diff\u00e9rents.<\/p>\n<p>On dit que <strong>les enzymes ont une double-sp\u00e9cificit\u00e9, de substrat et d&rsquo;action.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1770\" src=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/Specificite-enzyme.png\" alt=\"Double sp\u00e9cificit\u00e9 des enzymes\" width=\"711\" height=\"398\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff00ff;\"><strong><a style=\"color: #ff00ff;\" href=\"http:\/\/thibault-svt.fr\/index.php\/wp_quiz\/1erespe-qr-ch1-enzymes\/\" target=\"_blank\" rel=\"noopener\">Questions r\u00e9ponses pour r\u00e9viser ce chapitre<\/a><\/strong><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>INTRODUCTION L&rsquo;organisme et chacune de ses cellules fonctionne gr\u00e2ce \u00e0 des r\u00e9actions chimiques dont l&rsquo;ensemble forme le m\u00e9tabolisme. Les m\u00e9tabolismes varient d\u2019une cellule \u00e0 une autre, notamment en fonction des adaptations de la structure des cellules (leur forme, leurs organites et les mol\u00e9cules qu\u2019elles poss\u00e8dent) &nbsp; Comment ces r\u00e9actions chimiques se d\u00e9roulent-elles ? Comment expliquer [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1235,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"full-width-page-template.php","meta":{"footnotes":""},"class_list":["post-1693","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>CHAPITRE 1 \u2013 Les enzymes, des prot\u00e9ines catalytiques essentielles au m\u00e9tabolisme - SVT<\/title>\n<meta name=\"description\" content=\"Cours et TP SVT 1\u00e8re - Enzymes - Catalyse - Prot\u00e9ines - Site actif - Substrat - Produit - Double sp\u00e9cificit\u00e9 - Lactase\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CHAPITRE 1 \u2013 Les enzymes, des prot\u00e9ines catalytiques essentielles au m\u00e9tabolisme - SVT\" \/>\n<meta property=\"og:description\" content=\"Cours et TP SVT 1\u00e8re - Enzymes - Catalyse - Prot\u00e9ines - Site actif - Substrat - Produit - Double sp\u00e9cificit\u00e9 - Lactase\" \/>\n<meta property=\"og:url\" content=\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/\" \/>\n<meta property=\"og:site_name\" content=\"SVT\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-28T16:21:01+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/\",\"url\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/\",\"name\":\"CHAPITRE 1 \u2013 Les enzymes, des prot\u00e9ines catalytiques essentielles au m\u00e9tabolisme - SVT\",\"isPartOf\":{\"@id\":\"http:\/\/thibault-svt.fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/#primaryimage\"},\"image\":{\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg\",\"datePublished\":\"2021-07-28T09:53:24+00:00\",\"dateModified\":\"2021-07-28T16:21:01+00:00\",\"description\":\"Cours et TP SVT 1\u00e8re - Enzymes - Catalyse - Prot\u00e9ines - Site actif - Substrat - Produit - Double sp\u00e9cificit\u00e9 - Lactase\",\"breadcrumb\":{\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/#primaryimage\",\"url\":\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg\",\"contentUrl\":\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2021\/07\/forme-proteine.jpg\",\"width\":768,\"height\":486},{\"@type\":\"BreadcrumbList\",\"@id\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/specialite\/chapitre-1-les-enzymes-des-proteines-catalytiques-essentielles-au-metabolisme\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"http:\/\/thibault-svt.fr\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Premi\u00e8res\",\"item\":\"http:\/\/thibault-svt.fr\/index.php\/premieres\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Sp\u00e9cialit\u00e9 &#8211; 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