Mediates sodium- and chloride-dependent transport of gamma-aminobutyric acid (GABA) (PubMed:17502375, PubMed:22932902). Mediates transport of beta-alanine (PubMed:17502375). Can also mediate transport of taurine and hypotaurine (By similarity). 4-aminobutanoate(out) + chloride(out) + 2 Na(+)(out) = 4-aminobutanoate(in) + chloride(in) + 2 Na(+)(in) chloride(out) + 2 Na(+)(out) + taurine(out) = chloride(in) + 2 Na(+)(in) + taurine(in) beta-alanine(out) + chloride(out) + 2 Na(+)(out) = beta-alanine(in) + chloride(in) + 2 Na(+)(in) chloride(out) + hypotaurine(out) + 2 Na(+)(out) = chloride(in) + hypotaurine(in) + 2 Na(+)(in) GABA transport is inhibited by beta-alanine, 2,3-diaminopropionic acid and SNAP-5114. Expressed in brain, kidney, lung, liver and testis. Belongs to the sodium:neurotransmitter symporter (SNF) (TC 2.A.22) family. SLC6A13 subfamily.