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