Transport protein

Transport proteins are a vast group of membrane-bound proteins that facilitate the movement of ions, small molecules, and macromolecules across biological membranes, which are otherwise impermeable to many polar or large substances (Wikipedia; Study.com). This broad classification includes several major superfamilies, most notably the solute carriers (SLC), ATP-binding cassette (ABC) transporters, and various ion channels and pumps (PMC; Tocris Bioscience). These proteins are essential for fundamental cellular processes such as nutrient uptake, waste excretion, signal transduction, and the maintenance of electrochemical gradients (Longdom Publishing; bioRxiv). Because they regulate the entry and exit of substances, they are primary determinants of drug pharmacokinetics, influencing how medications are absorbed, distributed, and eventually cleared from the body (Vertex; eLife). Dysfunctions in transport proteins are linked to a wide range of pathologies, including genetic disorders like cystic fibrosis, metabolic diseases like diabetes, and the development of multidrug resistance in cancer (PMC; Vrije Universiteit Brussel). Consequently, specific members of this class are high-value therapeutic targets for a diverse array of drugs, including SGLT2 inhibitors for diabetes, SSRIs for depression, and diuretics for hypertension (PMC; Tocris Bioscience; PMC).

Other names

Membrane transport proteinCarrier proteinTransporterPermeasePoreTransmembrane transport protein

Drugs targeting these proteins typically act by inhibiting the translocation of substrates through competitive or non-competitive binding, occluding pores, or modulating ATPase activity in primary active transporters (PMC; Tocris Bioscience).