Plastoquinone

Plastoquinone

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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 =
Solubility =
Section7 = Chembox Hazards
MainHazards =
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Section8 = Chembox Related
OtherCpds = 1,4-benzoquinone quinone Coenzyme Q10

Plastoquinone, (often abbreviated PQ), is a quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. Plastoquinone is reduced (accepts two protons (H+) from the stromal matrix of the chloroplast, coupled to two electrons (e-) from photosystem II), forming plastoquinol. It transports the protons to the lumen of thylakoid discs, while the electrons continue through the electron transport chain into the cytochrome "b"6"f" protein complex.

References

*cite book | author=Berg, J; Tymoczko, J; Stryer, L | title=Biochemistry (Fifth Edition) | publisher=W H Freeman and Company | year=2002 | id=ISBN 0716746840


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  • 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) …   Wikipédia en Français

  • 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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