Electron acceptor

An electron acceptor is a chemical entity or molecule that receives electrons transferred to it from another compound (the electron donor) during a redox reaction [1][2]. In biological systems, this role is fundamental to energy production; most notably, molecular oxygen serves as the terminal electron acceptor in the mitochondrial electron transport chain, a process essential for the synthesis of ATP through oxidative phosphorylation [1][3]. Other critical biological electron acceptors include coenzymes such as NAD+ and FAD, which shuttle electrons to various metabolic pathways, and various cytochromes within the mitochondria [2]. In pharmacology, certain therapeutic agents act as electron acceptors, such as bioreductive prodrugs like mitomycin C that are activated upon reduction, particularly in the hypoxic environments common to solid tumors [4][5]. However, the introduction of exogenous electron acceptors or the dysregulation of endogenous ones can lead to the production of reactive oxygen species (ROS), causing oxidative stress and cellular damage [6]. Because the term 'electron acceptor' describes a broad functional class of molecules ranging from gases to complex proteins rather than a single specific molecule, it is not categorized as a discrete therapeutic target [2].

Other names

Oxidizing agentOxidantElectron sink

Accepts electrons from donor molecules to facilitate redox cycles, drive metabolic reactions, or undergo bioactivation to form cytotoxic species [1][4][5].