Diphosphate de thiamine
- Diphosphate de thiamine
-
Thiamine pyrophosphate
| Thiamine pyrophosphate |
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| Général |
| No CAS |
154-87-0 |
| No EINECS |
205-836-1 |
| SMILES |
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| InChI |
InChI=1/C12H18N4O7P2S.ClH/c1-8-11(3-4-22-25(20,21)23-24(17,18)19)26-7-16(8)6-10-5-14-9(2)15-12(10)13;/h5,7H,3-4,6H2,1-2H3,(H4-,13,14,15,17,18,19,20,21);1H
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| Propriétés chimiques |
| Formule brute |
C12H19ClN4O7P2S [Isomères]
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| Masse molaire |
460,767 g∙mol-1
C 31,28 %, H 4,16 %, Cl 7,69 %, N 12,16 %, O 24,31 %, P 13,44 %, S 6,96 %,
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Unités du SI & CNTP, sauf indication contraire.
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La thiamine pyrophosphate (figure 1) est un coenzyme de transfert. Dérivé de la thiamine (vitamine B1), il est fixé à l'enzyme, c'est un groupement prosthétique.
Il participe aux réactions de décarboxylation.
La thiamine pyrophosphate est l'effecteur de la biosynthèse de la thiamine chez un certain nombre d'organismes pour lesquels ce n'est pas une vitamine (bactéries, plantes). L'expression des gènes correspondants est réprimée lorsque la concentration de thiamine pyrophosphate est suffisante. Ce contrôle passe par une régulation de la traduction des ARNm, qui implique un riboswitch.
Structure de la thiamine pyrophosphate. La flèche indique l'endroit de fixation du substrat.
Portail de la biologie
Portail de la biochimie
Catégories : Composé du phosphore | Coenzyme | Thiazole | Pyrimidine
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