Plastoquinone

Plastoquinone
Plastoquinone
Plastoquinone
Général
Nom IUPAC 2,5-Cyclohexadiene-1,4-dione, 2,3-dimethyl-5-(3,7,11,15,19,23,27,31,35-nonamethyl-2,6,10,14,18,22,26,30,34-hexatriacontanonaenyl)-, (all-E)-
Synonymes
  • Plastoquinone 9
  • PQ 9
No CAS 4299-57-4
PubChem 6433402
SMILES
InChI
Propriétés chimiques
Formule brute C53H80O2  [Isomères]
Masse molaire[1] 749,2011 ± 0,0486 g·mol-1
C 84,97 %, H 10,76 %, O 4,27 %,
Composés apparentés
Autres composés 1,4-benzoquinone, Coenzyme Q10, Vitamine K
Unités du SI & CNTP, sauf indication contraire.

Une plastoquinone est un coenzyme de la famille des quinones participant au transfert des électrons, notamment chez les chloroplastes, et à la photosynthèse. Elle est localisée dans la membrane des thylakoïdes. Elle reçoit les électrons provenant du photosystème II et les transfère sur le complexe cytochrome b6-f. Son potentiel redox est voisin de 0 V, entre le potentiel redox du photosystème II activé (de l'ordre de - 0,8 V) et celui du complexe b6-f (de l'ordre de + 0,4 V).

Notes et références

  1. ↑ Masse molaire calculée d’après Atomic weights of the elements 2007 sur www.chem.qmul.ac.uk.

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  • Plastoquinone — Chembox new ImageFile = Plastoquinone.png Section1 = Chembox Identifiers CASNo = 4299 57 4 PubChem = 6433402 SMILES = Section2 = Chembox Properties Formula = C53H80O2 MolarMass = 749,20 g·mol−1 Appearance = Density = MeltingPt = BoilingPt =… …   Wikipedia

  • plastoquinone — noun Etymology: Greek plastos + English quinone Date: 1958 a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation …   New Collegiate Dictionary

  • plastoquinone — A quinone present in chloroplasts, forming part of the photosynthetic electron transport chain. Closely associated with photosystem II. May be stored in plastoglobuli …   Dictionary of molecular biology

  • plastoquinone — /plas toh kweuh nohn , kwin ohn/, n. Biochem. a quinone that occurs in the chloroplasts of plants and functions as an electron carrier during photosynthesis. [1955 60; (CHLORO)PLAST or PLAST(ID) + O + QUINONE] * * * …   Universalium

  • plastoquinone — noun a quinone, related to the carotenoids, involved in the electron transport process of photosynthesis …   Wiktionary

  • plastoquinone — 2,3 Dimethyl 1,4 benzoquinone with a multiprenyl side chain; a trivial name sometimes used for p. 9. * * * plas·to·qui·none .plas (.)tō kwin ōn, kwin .ōn n any of a group of substances that occur mostly in plant chloroplasts, are related to… …   Medical dictionary

  • plastoquinone — plas·to·quinone …   English syllables

  • plastoquinone — One of a group of compounds involved in the transport of electrons as part of the process of photosynthesis …   Glossary of Biotechnology

  • plastoquinone — ˌ noun Etymology: plasto + quinone : any of a group of substances that occur mostly in plant chloroplasts, consist of paraquinone with two methyl substituents and a side chain of one or more isoprene units, are related to vitamin K, and play a… …   Useful english dictionary

  • plastoquinone-9 (PQ-9), plastoquinone E9 — 2,3 Dimethyl 6 nonaprenyl 1,4 benzoquinone; one of a group of vitamins E and K and coenzymes Q; the isomeric form is plastochromenol 8; a participant in photosynthetic electron transport …   Medical dictionary

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