Na(+)/sulfate cotransporter with a probable high-affinity for sulfate and a proteasome dependent turnover. Up-regulated by sulfur deprivation. No effect on sulfate uptake, due to the redundancy with SLT2 and SULTR2. Slt1 and slt2, as well as slt1 and sultr2 double mutants show a 50% decline in uptake while the slt1, slt2 and sultr2 triple mutant exhibits no increase in sulfate uptake capacity when deprived of sulfur. Belongs to the divalent anion:Na+ symporter (DASS) superfamily. Na+/sulfate symporter (TC 2.A.47.4) family.