Definition:

Electroneutral antiporter that translocates urate across the apical membrane of proximal tubular cells in exchange for monovalent organic or inorganic anions. Involved in renal reabsorption of urate and helps maintaining blood levels of uric acid. Mediates urate uptake by an exchange with organic anions such as (S)-lactate and nicotinate, and inorganic anion Cl(-). Other inorganic anions such as Br(-), I(-) and NO3(-) may also act as counteranions that exchange for urate. Also mediates orotate tubular uptake coupled with nicotinate efflux and to a lesser extent with lactate efflux, therefore displaying a potential role in orotate renal reabsorption. Orotate transport is Cl(-)-dependent.