Plastoquinone
- Plastoquinone
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Plastoquinone |
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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 |
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No CAS |
4299-57-4 |
PubChem |
6433402 |
SMILES |
CC1= C( C(= O) C(= CC1= O) CC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) CCC= C( C) C) C
PubChem, Vue 3D
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InChI |
InChI : Vue 3D
InChI= 1/ C53H80O2/ c1- 40( 2) 21- 13- 22- 41( 3) 23- 14- 24- 42( 4) 25- 15- 26- 43( 5) 27- 16- 28- 44( 6) 29- 17- 30- 45( 7) 31- 18- 32- 46( 8) 33- 19- 34- 47( 9) 35- 20- 36- 48( 10) 37- 38- 51- 39- 52( 54) 49( 11) 50( 12) 53( 51) 55/ h21, 23, 25, 27, 29, 31, 33, 35, 37, 39H, 13- 20, 22, 24, 26, 28, 30, 32, 34, 36, 38H2, 1- 12H3/ b41- 23+, 42- 25+, 43- 27-, 44- 29+, 45- 31+, 46- 33+, 47- 35+, 48- 37+
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Propriétés chimiques |
Formule brute |
C53H80O2 [Isomères]
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Masse molaire[1] |
749,2011 ± 0,0486 g·mol-1
C 84,97 %, H 10,76 %, O 4,27 %,
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Composés apparentés |
Autres composés |
1,4-benzoquinone, Coenzyme Q10, Vitamine K |
Unités du SI & CNTP, sauf indication contraire.
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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
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Contenu soumis à la licence CC-BY-SA. Source : Article Plastoquinone de Wikipédia en français (auteurs)
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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