Plastoquinone
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Plastoquinone
Identifiers
CAS number	[4299-57-4]
PubChem	6433402
Properties
Molecular formula	C53H80O2
Molar mass	749,20 g·mol−1
Related compounds
Related compounds	1,4-benzoquinone quinone Coenzyme Q10
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references

Plastoquinone (oxidized form)

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 b₆f protein complex.

Plastoquinol (reduced form)

References

• Berg, J; Tymoczko, J; Stryer, L (2002). Biochemistry (Fifth Edition). W H Freeman and Company. ISBN 0716746840.