Solute carrier protein (SLC)

Solute carrier proteins (SLCs) are the largest superfamily of secondary active and facilitative membrane transporters, comprising over 400 unique human proteins grouped into 66 families[1][2][3][4][7][10]. They mediate the regulated transmembrane movement of a vast array of substrates—including nutrients (sugars, amino acids, vitamins), metabolites, inorganic ions, drugs, and neurotransmitters—across cellular and organelle membranes[1][7][8]. SLCs do not directly use ATP as an energy source; instead, they harness existing electrochemical gradients (secondary active transport) or facilitate diffusion along a concentration gradient[1][8][11]. These proteins are essential for cellular homeostasis, metabolite exchange, and drug absorption/disposition, and many individual SLCs act as therapeutic targets or drug transporters influencing pharmacokinetics and efficacy[8][10][11]. SLC dysfunction is implicated in metabolic, neurological, cardiovascular, and hereditary diseases. **Note:** “Solute carrier proteins” is a superfamily descriptor and not the name of a single molecular target; the specificity of any answer at the family or individual protein level (e.g., SLC6A4, SLC2A1) is crucial for actionable pharmacological information[1][3][4][8][10].

Other names

Solute carrierSLC transporterSolute carrier superfamilySLC protein

Inhibition of substrate transport (e.g., serotonin uptake inhibition), Blockade of nutrient or ion import/export, Competitive substrate binding, Allosteric modulation of transporter conformation