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Sodium-chloride symporter
The sodium-chloride symporter (also known as Na+-Cl− cotransporter, abbreviated as NCC or NCCT, or as the thiazide-sensitive Na+-Cl− cotransporter or TSC for short) is a cotransporter in the kidney which has the function of reabsorbing sodium and chloride ions from the tubular fluid into the cells of the distal convoluted tubule of the nephron. It is a member of the SLC12 cotransporter family of electroneutral cation-coupled chloride cotransporters. In humans, it is encoded by the gene ''SLC12A3'' (solute carrier family 12 member 3) located in 16q13.
== Molecular biology ==
The sodium-chloride symporter or NCC is a member of the SLC12 cotransporter family of electroneutral cation-coupled chloride cotransporter, along with the potassium-chloride cotransporters (K+-Cl− cotransporters or KCCs), the sodium-potassium-chloride cotransporters (Na+-K+-Cl− cotransporters or NKCCs) and orphan member CIP (cotransporter interacting protein) and CCC9. The sodium-chloride symporter's protein sequence has a high degree of identity between different mammalian species (over 90% between human, rat and mouse). The ''SLC12A3'' gene encodes for a protein of 1,002 to 1,030 amino acid residues. NCC is a transmembrane protein, presumed to have a hydrophobic core of either 10 or 12 transmembrane domains with intracellular amino- and carboxyl-terminus domains. The exact structure of the NCC protein is unknown, as it has not yet been crystallized. The NCC protein forms homodimers at the plasma membrane.
N-glycosylation occurs in two sites in a long extracellular loop connecting two transmembrane domains within the hydrophobic core. This posttranslational modification is necessary for proper folding and transport of the protein to the plasma membrane.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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