High Quality Content by WIKIPEDIA articles! Plastoquinone (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. A quinone is a class of organic compounds that are formally derived from aromatic compounds (such as benzene or naphthalene) by exchanging an even number of –CH= groups by –C(=O)– groups, with any necessary rearrangement of double bonds, resulting in a fully conjugated cyclic dione structure. The class includes derivatives of heterocyclic aromatic compounds. The prototypical member of the class are 1,4-benzoquinone or cyclohexadienedione, often called simply quinone (whence the name of the class). Other important examples are 1,2-benzoquinone (ortho-quinone), 1,4-naphthoquinone and 9,10-anthraquinone.

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