Any molecular entity that serves as an electron acceptor and electron donor in an electron transport chain. An electron transport chain is a process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient. [ https://www.worldcat.org/search?q=bn%3A0198506732 ]
Term information
goslim_metagenomics, goslim_pir
Note that this term should only be be used for electron transfer that generates a transmembrane electrochemical gradient, e.g. components of the respiratory or photosynthetic electron transport chain.