Voltage-gated chloride channel. Chloride channels have several functions including the regulation of cell volume; membrane potential stabilization, signal transduction and transepithelial transport. May be important in urinary concentrating mechanisms. May be the basolateral chloride channel mediating net chloride absorption in CTAL cells. Homodimer (By similarity). Interacts with BSND. Forms heteromers with BSND in the thin ascending limb of Henle. Specifically expressed in the kidney. All nephron segments expressing BSND also express CLCNK proreins. Belongs to the chloride channel (TC 2.A.49) family. CLCNKA subfamily.