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SLC12 family of cation-coupled chloride transporters C

Unless otherwise stated all data on this page refer to the human proteins. Gene information is provided for human (Hs), mouse (Mm) and rat (Rn).


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The SLC12 family of chloride transporters contribute to ion fluxes across a variety of tissues, particularly in the kidney and choroid plexus of the brain. Within this family, further subfamilies are identifiable: NKCC1, NKCC2 and NCC constitute a group of therapeutically-relevant transporters, targets for loop and thiazide diuretics. These 12 TM proteins exhibit cytoplasmic termini and an extended extracellular loop at TM7/8 and are kidney-specific (NKCC2 and NCC) or show a more widespread distribution (NKCC1). A second family, the K-Cl co-transporters are also 12 TM domain proteins with cytoplasmic termini, but with an extended extracellular loop at TM 5/6. CCC6 exhibits structural similarities with the K-Cl co-transporters, while CCC9 is divergent, with 11 TM domains and a cytoplasmic N-terminus and extracellular C-terminus.


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NKCC2 (Kidney-specific Na-K-Cl symporter / SLC12A1) C Show summary » More detailed page go icon to follow link

NKCC1 (Basolateral Na-K-Cl symporter / SLC12A2) C Show summary »

NCC (Na-Cl symporter / SLC12A3) C Show summary » More detailed page go icon to follow link

KCC1 (K-Cl cotransporter 1 / SLC12A4) C Show summary »

KCC2 (K-Cl cotransporter 2 / SLC12A5) C Show summary »

KCC3 (K-Cl cotransporter 3 / SLC12A6) C Show summary »

Target Id 973
Nomenclature K-Cl cotransporter 3
Systematic nomenclature SLC12A6
Common abbreviation KCC3
Previous and unofficial names Electroneutral potassium-chloride cotransporter 3 | ACCPN | agenesis of corpus callosum and peripheral neuropathy (Andermann syndrome) | furosemide-sensitive KCl cotransporter 3 | gaxp | solute carrier family 12 (potassium/chloride transporters), member 6 | solute carrier family 12 (potassium/chloride transporter), member 6 | solute carrier family 12
Genes SLC12A6 (Hs), Slc12a6 (Mm), Slc12a6 (Rn)
Ensembl ID ENSG00000140199 (Hs), ENSMUSG00000027130 (Mm), ENSRNOG00000005196 (Rn)
UniProtKB AC Q9UHW9 (Hs), Q924N4 (Mm)
Bioparadigms SLC Tables SLC12A6 (Hs)
Stoichiometry 1 K+ : 1 Cl- (out)

KCC4 (K-Cl cotransporter 4 / SLC12A7) C Show summary »

CCC9 (Cation-chloride cotransporter 9 / SLC12A8) C Show summary »

CCC6 (Cation-chloride cotransporter 6 / SLC12A9) Show summary »


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Further reading

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How to cite this family page

Database page citation:

SLC12 family of cation-coupled chloride transporters. Accessed on 10/12/2023. IUPHAR/BPS Guide to PHARMACOLOGY,

Concise Guide to PHARMACOLOGY citation:

Alexander SP, Kelly E, Mathie A, Peters JA, Veale EL et al. (2021) THE CONCISE GUIDE TO PHARMACOLOGY 2021/22: Transporters. Br J Pharmacol. 178 Suppl 1:S412-S513.