Carrier protein

Carrier proteins are a class of membrane-spanning proteins that facilitate the selective transport of specific molecules, such as ions, nutrients, and metabolites, across biological membranes[1][5][7]. Unlike channel proteins, carrier proteins bind to their substrates and undergo conformational changes to move them across the membrane. They may mediate transport by passive facilitated diffusion (down a concentration gradient) or by active transport (against a gradient), using energy derived from ATP hydrolysis (primary active transport) or secondary to existing ion gradients (secondary active transport)[1][3][7][9]. Major types of carrier proteins include uniporters, symporters, and antiporters, classified by the number and directionality of substrates they transport[3][9]. As a term, "carrier protein" refers to a broad functional category encompassing many specific protein families such as the solute carrier (SLC) family, ABC transporters, and others, each with distinct pharmacological and physiological attributes[2][7][10].\n\nNote:\n"Carrier protein" is a generic category, not a single, specific target or molecular entity. It refers to a very large, heterogeneous group of transport proteins. For structured drug discovery or target annotation, more specific names (e.g., "Solute carrier family 6 member 4 (SLC6A4), Serotonin transporter") are needed to avoid ambiguity. Thus, "carrier protein" is not a canonical target name, nor is it suitable as a direct therapeutic target entry without further specification.

Other names

TransporterMembrane carrierPorterMembrane transport protein

Inhibition of substrate transport (blocker); Substrate analog competition; Altered transporter function (modulator, e.g., allosteric); Pump reversal (for some ion transporters)