Sodium-Coupled Transport Mechanisms in Metabolic Regulation

Sodium–coupled transport mechanisms harness the electrochemical gradient of Na+ to drive the uphill uptake of key metabolic intermediates such as citrate, succinate and α-ketoglutarate. Members of the solute carrier family, notably the divalent anion sodium symporter (DASS) family and the SLC13 gene products, couple the movement of Na+ ions to the translocation of di- and tricarboxylates across the plasma membrane. This electrogenic cotransport links extracellular nutrient availability to intracellular pathways of energy production, lipid and cholesterol synthesis, and metabolic signalling. Tissue-specific expression in the liver, brain, kidney and intestine underscores the role of these transporters in organ-level homeostasis, while ion sensitivity, stoichiometric coupling and regulatory allosteric sites fine-tune substrate flux. A growing body of structural, genetic and pharmacological studies has illuminated the molecular transport cycle, revealed disease-causing mutations, and spurred interest in selective transporter inhibition as a therapeutic strategy for metabolic and renal disorders.

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Technical terms

Sodium-coupled co-transport: The process by which movement of Na+ down its electrochemical gradient drives the coupled, uphill uptake of metabolites across a cell membrane.

Divalent anion sodium symporter (DASS): A family of membrane transport proteins that import di- and tricarboxylates by coupling substrate binding to Na+ co-transport through an elevator-type conformational change.

SLC13A5 (NaCT): A member of the solute carrier 13 family functioning as an electrogenic sodium–citrate co-transporter critical for delivering citrate into liver, brain and other tissues.

Electrogenic transport: A form of solute movement that results in net charge transfer across the membrane, contributing to the membrane potential.

References

1. The citrate transporter SLC13A5 as a therapeutic target for kidney disease: evidence from Mendelian randomization to inform drug development. BMC Medicine (2023).
2. Structural basis for the reaction cycle of DASS dicarboxylate transporters. eLife (2020).
3. Structure, Function, and Expression Pattern of a Novel Sodium-coupled Citrate Transporter (NaCT) Cloned from Mammalian Brain*. Journal of Biological Chemistry (2002).