Photosynthetic electron transport chain (PETC)

The **photosynthetic electron transport chain** refers to a multicomponent system, not a single molecule or receptor. It is composed of a series of protein complexes and mobile electron carriers located in the thylakoid membrane of chloroplasts in plants, algae, and cyanobacteria. The PETC includes complexes such as **photosystem II (PSII)**, **cytochrome b6f complex**, **photosystem I (PSI)**, and the electron carriers **plastoquinone**, **plastocyanin**, and **ferredoxin**. Light energy drives electron transfer through these complexes, resulting in the generation of ATP and NADPH, which are essential for carbon fixation in the Calvin cycle. The PETC features both **linear** and **cyclic** electron flow pathways, enabling flexible adaptation to environmental conditions and protective mechanisms against light-induced stress. While essential for plant, algal, and cyanobacterial survival, and as the mechanistic basis for oxygenic photosynthesis, the PETC itself is not a druggable therapeutic target in a clinical sense but may be targeted (e.g., by herbicides) in agriculture[2][3][4][5][6].\n\nKey points:\n- The term "Photosynthetic electron transport chain" describes a **biochemical pathway composed of multiple protein complexes and carriers**, not a discrete receptor, protein, or molecular entity.\n- It is **not considered a therapeutic target** for human disease and thus entries such as "interacting drugs," "mechanism of action," "biomarkers," or "safety concerns" do not apply in the clinical/pharmacological sense.\n- Some herbicides (not drugs) target protein components of this pathway (e.g., photosystem II inhibitors), but these are not generally classified as drugs against a canonical single target molecule.\n\nCaveat: The target name describes a functional chain/pathway, *not* an individual molecule or receptor, and thus does not fit standard drug target schema. If you seek information on a specific protein within the chain (such as "Photosystem II" or "Cytochrome b6f complex"), more distinct, structured data can be provided for that molecular entity.

Other names

Photosynthetic electron transportPhotosynthetic electron transfer chainPhotosynthetic electron transport systemPETC