Cotransporter

Part of speech: noun

Definitions

1. A protein that facilitates the simultaneous movement of two different ions or molecules across a biological membrane
2. a type of membrane protein that helps transport substances into or out of cells by coupling their movement
3. a mechanism that enables the co-transport of multiple substrates, often against a concentration gradient, across cellular membranes

Etymology: Cotransporter is a straightforward modern compound: "co-" meaning "together" or "jointly," the verb "transport," and the agent suffix "-er." Its parts are all long-established English, so the word is a technical coinage built from familiar pieces rather than a term with a dramatic backstory. The "-er" ending comes through Middle English from the Latin suffix "-arius," which passed through Old French and reached English as a way of naming a person or thing that performs an action, as in "reader" or "carrier." The prefix "co-" is the more interesting part. It comes from Latin "com-," meaning "with" or "together," and it is attached freely to English words to indicate joint action, as in "coexist" or "cooperate." In biology, a cotransporter is a membrane protein that moves two substances at once, so the prefix names the coupling that defines it: one molecule's movement is linked to another's, carried across the cell membrane together.

Synonyms: transmembrane protein, transport protein, carrier protein, membrane transporter, transport molecule