Antiporter

Part of speech: noun

Definitions

1. A transport protein that facilitates the movement of ions or molecules across a cellular membrane in opposite directions
2. A type of membrane protein involved in the exchange of substances by moving one particle into the cell while simultaneously exporting another out
3. A specific protein that enables the concurrent transport of multiple substances across a membrane, allowing for reciprocal movement of specific ions or molecules

Etymology: Antiporter is a technical coinage from the 20th century, built from classical parts rather than inherited from ancient Greek or Latin. The first element, "anti-", comes from Greek "anti" meaning "against" or "opposite," and the second, "porter," derives from Latin "portare," "to carry." The Latin root also gave English "porter" in the sense of one who carries loads, and "transport" and "import" through the same verb. The term was formed to describe a biological transport mechanism. A membrane transporter that moves one substance into a cell while simultaneously moving another out, in the opposite direction, was given the name "antiporter" to contrast with "symporter," a protein that moves two substances together in the same direction. The pair of names thus describes motion relative to each other: "anti" for opposite, "sym" for together. Because the word was coined by biochemists, its meaning is precise and narrow. It names a class of carrier proteins rather than a general idea of exchange, and it appears in scientific literature rather than everyday speech.

Synonyms: transport protein