Plastoquinones

Plastoquinones are a group of electron transport molecules between photosystem II and photosystem I in plants. The sequence of carriers is as follows: Pheophytin -> Q A -> Q B -> Q H -> Cytochrome b 6f, where Q A, Q B, and Q H are the plastoquinones. Plastoquinone Q B and Q A are associated with PSII proteins. Electron transfer involving plastoquinones is shown here. Reduction of a plastoquinone creates a plastoquinol.

See also: Plastoquinone Q H, Pheophytin, Plastoquinone Q A, Photosystem II, Photosystem I