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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ribothymidine</span></h1>
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<td colspan="2" class="entete defaut" style="background-color:#FFDEAD;color:black;">Ribothymidine
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<td colspan="2" style="text-align:center;">Structure de la ribothymidine</td>
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<th colspan="2" style="padding:4px; text-align:center; background-color:#FFDEAD; color:#000000">Identification</th></tr>
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<th scope="row"><a href="Nomenclature_de_l'UICPA" title="Nomenclature de l'UICPA">Nom UICPA</a>
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<td><small>1-[(2<i>R</i>,3<i>R</i>,4<i>S</i>,5<i>R</i>)-3,4-dihydroxy-5-(hydroxyméthyl)oxolan-2-yl]-5-méthylpyrimidine-2,4-dione</small>
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<th scope="row"><a href="Synonymie" title="Synonymie">Synonymes</a>
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<p>5-méthyluridine
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<th scope="row"><a href="Num%C3%A9ro_CAS" title="Numéro CAS">N<sup>o</sup> CAS</a>
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<td><span class="reflink neverexpand"><span class="noarchive"><a class="external text" href="https://tools.wmflabs.org/magnustools/cas.php?cas=1463-10-1&language=fr&title=Ribothymidine">1463-10-1</a></span></span>
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<th scope="row"> N<sup>o</sup> <a href="Agence_europ%C3%A9enne_des_produits_chimiques" title="Agence européenne des produits chimiques">ECHA</a>
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<td><span class=""><span class="noarchive"><a rel="nofollow" class="external text" href="https://echa.europa.eu/substance-information/-/substanceinfo/100.014.522">100.014.522</a></span></span></td>
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<th scope="row"><a href="Num%C3%A9ro_CE" title="Numéro CE">N<sup>o</sup> CE</a>
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<td>215-973-9
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<th scope="row"><a href="PubChem" title="PubChem">PubChem</a>
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<td><span class=""><span class="noarchive"><a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/445408">445408</a></span></span>
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<th scope="row">ChEBI
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<td><span class=""><span class="noarchive"><a rel="nofollow" class="external text" href="http://www.ebi.ac.uk/chebi/searchId.do?chebiId=30821">30821</a></span></span>
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<th scope="row"><a href="Simplified_Molecular_Input_Line_Entry_System" title="Simplified Molecular Input Line Entry System">SMILES</a>
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<td><div class="NavFrame" title="[afficher]/[masquer]" style="border: none; padding: 0;"><div class="NavContent" style="display: none; text-align: left;">CC1=CN(C(=O)NC1=O)[C@H]2[C@@H]([C@@H]([C@H](O2)CO)O)O <br><span class="reflink neverexpand"><a rel="nofollow" class="external text" href="http://pubchem.ncbi.nlm.nih.gov/search/?smarts=CC1%3DCN%28C%28%3DO%29NC1%3DO%29%5BC%40H%5D2%5BC%40%40H%5D%28%5BC%40%40H%5D%28%5BC%40H%5D%28O2%29CO%29O%29O">PubChem</a></span>, <span class="reflink neverexpand"><a rel="nofollow" class="external text" href="http://chemapps.stolaf.edu/jmol/jmol.php?title=Ribothymidine&model=CC1%3DCN%28C%28%3DO%29NC1%3DO%29%5BC%40H%5D2%5BC%40%40H%5D%28%5BC%40%40H%5D%28%5BC%40H%5D%28O2%29CO%29O%29O">vue 3D</a></span></div></div>
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<th scope="row"><a href="International_Chemical_Identifier" title="International Chemical Identifier">InChI</a>
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<td><div class="NavFrame" title="[afficher]/[masquer]" style="border: none; padding: 0;"><div class="NavContent" style="display: none; text-align: left;"><b>InChI :</b> <span class="reflink neverexpand"><a rel="nofollow" class="external text" href="http://chemapps.stolaf.edu/jmol/jmol.php?title=Ribothymidine&model=InChI%3D1%2FC10H14N2O6%2Fc1-4-2-12%2810%2817%2911-8%284%2916%299-7%2815%296%2814%295%283-13%2918-9%2Fh2%2C5-7%2C9%2C13-15H%2C3H2%2C1H3%2C%28H%2C11%2C16%2C17%29%2Ft5-%2C6-%2C7-%2C9-%2Fm1%2Fs1">vue 3D</a></span> <br>InChI=1/C10H14N2O6/c1-4-2-12(10(17)11-8(4)16)9-7(15)6(14)5(3-13)18-9/h2,5-7,9,13-15H,3H2,1H3,(H,11,16,17)/t5-,6-,7-,9-/m1/s1 <br><b>Std. InChI :</b> <span class="reflink neverexpand"><a rel="nofollow" class="external text" href="http://chemapps.stolaf.edu/jmol/jmol.php?title=Ribothymidine&model=InChI%3D1S%2FC10H14N2O6%2Fc1-4-2-12%2810%2817%2911-8%284%2916%299-7%2815%296%2814%295%283-13%2918-9%2F%0Ah2%2C5-7%2C9%2C13-15H%2C3H2%2C1H3%2C%28H%2C11%2C16%2C17%29%2Ft5-%2C6-%2C7-%2C9-%2Fm1%2Fs1">vue 3D</a></span> <br>InChI=1S/C10H14N2O6/c1-4-2-12(10(17)11-8(4)16)9-7(15)6(14)5(3-13)18-9/
h2,5-7,9,13-15H,3H2,1H3,(H,11,16,17)/t5-,6-,7-,9-/m1/s1 <br><b>Std. InChIKey :</b> <br>DWRXFEITVBNRMK-JXOAFFINSA-N</div></div>
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<th colspan="2" style="padding:4px; text-align:center; background-color:#FFDEAD; color:#000000">Propriétés chimiques</th></tr>
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<th scope="row"><a href="Formule_chimique" title="Formule chimique">Formule</a>
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<td><a href="Carbone" title="Carbone">C</a><sub>10</sub><a href="Hydrog%C3%A8ne" title="Hydrogène">H</a><sub>14</sub><a href="Azote" title="Azote">N</a><sub>2</sub><a href="Oxyg%C3%A8ne" title="Oxygène">O</a><sub>6</sub> <span class="page_h"><a href="C10H14N2O6" class="mw-disambig" title="C10H14N2O6"><small>[Isomères]</small></a></span><br>
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<th scope="row"><a href="Masse_molaire" title="Masse molaire">Masse molaire</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<td>258,228 ± 0,011 2 <a href="Gramme" title="Gramme">g</a>/<a href="Mole_(unit%C3%A9)" title="Mole (unité)">mol</a> <br><small>C 46,51 %, H 5,46 %, N 10,85 %, O 37,18 %, </small>
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<td colspan="2"><hr style="height:2px; background-color:#FFDEAD;"></td></tr>
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<td colspan="2" style="text-align:center;">Unités du <a href="Syst%C3%A8me_international_d'unit%C3%A9s" title="Système international d'unités">SI</a> et <a href="Conditions_normales_de_temp%C3%A9rature_et_de_pression" title="Conditions normales de température et de pression"><abbr title="conditions normales de température et de pression">CNTP</abbr></a>, sauf indication contraire.</td>
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<p>La <b>ribothymidine</b> (<b>rT</b>), ou <b>5-méthyluridine</b> (<b>m<sup>5</sup>U</b>), est un <a href="Ribonucl%C3%A9oside" title="Ribonucléoside">ribonucléoside</a> constitué de <a href="R%C3%A9sidu_(biochimie)" title="Résidu (biochimie)">résidus</a> de <a href="Thymine" title="Thymine">thymine</a> et de <a href="Ribose" title="Ribose">ribose</a> combinés par une <a href="Liaison_glycosidique" class="mw-redirect" title="Liaison glycosidique">liaison glycosidique</a> β-N<sub>1</sub>. Son <a href="D%C3%A9soxyribonucl%C3%A9oside" title="Désoxyribonucléoside">désoxyribonucléoside</a> correspondant est la <a href="Thymidine" title="Thymidine">thymidine</a>.
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<div class="mw-heading mw-heading2"><h2 id="Rôle_biologique"><span id="R.C3.B4le_biologique"></span>Rôle biologique</h2></div>
<p>La ribothymidine est un ribonucléoside rare qu'on trouve principalement dans le bras T des <a href="ARN_de_transfert" class="mw-redirect" title="ARN de transfert">ARN<sub>t</sub></a>. Elle n'est pas incorporée directement au cours de la <a href="Transcription_(biologie)" title="Transcription (biologie)">transcription</a> par l'<a href="ARN_polym%C3%A9rase" class="mw-redirect" title="ARN polymérase">ARN polymérase</a>, contrairement à ce qui se passe pour la <a href="Thymidine" title="Thymidine">thymidine</a> présente dans l'<a href="Acide_d%C3%A9soxyribonucl%C3%A9ique" title="Acide désoxyribonucléique">ADN</a> ; lors de la transcription, une <a href="Uridine" title="Uridine">uridine</a> est incorporée dans le précurseur de l'ARN<sub>t</sub>, qui est ensuite modifiée par une enzyme spécifique, <span class="nowrap">l'ARN<sub>t</sub> (uracile 5-)-méthyltransférase</span> (<a href="Nomenclature_EC" title="Nomenclature EC">EC</a> <span class="reflink neverexpand"><span class="noarchive"><a rel="nofollow" class="external text" href="http://www.expasy.org/enzyme/2.1.1.35"><span title="Transferases, Transferring One-Carbon Groups, Methyltransferases, tRNA (uracil-5-)-methyltransferase">2.1.1.35</span></a></span></span>).
</p><p>La ribothymidine est incorporée spécifiquement en position 54 des <a href="ARN_de_transfert" class="mw-redirect" title="ARN de transfert">ARNt</a> et contribue à la stabilisation de la <a href="Structure_de_l'ARN" title="Structure de l'ARN">structure tridimensionnelle de ces ARN</a>.
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<div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2></div>
<div class="references-small decimal" style=""><div class="mw-references-wrap"><ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a> </span><span class="reference-text">Masse molaire calculée d’après <span class="ouvrage">« <a rel="nofollow" class="external text" href="http://www.chem.qmul.ac.uk/iupac/AtWt/"><cite style="font-style:normal;"><span class="lang-en" lang="en">Atomic weights of the elements 2007</span></cite></a> », sur <span class="italique">www.chem.qmul.ac.uk</span></span>.</span>
</li>
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