An antiporter (also called exchanger or counter-transporter) is an
integral membrane proteinwhich is involved in secondary active transportof two or more different molecules or ions (i.e. solutes) across a phospholipid membrane such as the plasma membranein opposite directions.
secondary active transport, one species of solute moves along its electrochemical gradient, allowing a different species to move against its own electrochemical gradient. This movement in contrast to primary active transport, in which all solutes are moved against their concentration gradients, fueled by ATP.
Transport may involve one or more of each type of solute. For example, the Na+/Ca2+ exchanger, used by many cells to remove cytoplasmic calcium, exchanges one calcium ion for three sodium ions.
Sodium/proton antiporter 1
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