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Electron transport chain
An
electron transport chain
(ETC) is a series of
compounds
that
transfer
electrons
from
electron donors
to
electron acceptors
via
redox
reactions, and couples this electron transfer with the transfer of
protons
(H
+
ions) across a
membrane
. This creates an electrochemical
proton gradient
that drives the synthesis of
adenosine triphosphate
(ATP), a molecule that stores energy chemically in the form of highly strained bonds. The
molecules
of the chain include
peptides
,
enzymes
(which are
proteins
or
protein complexes
), and others. The final acceptor of electrons in the electron transport chain is molecular
oxygen
.
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