Mediates sodium- and chloride-dependent transport of gamma-aminobutyric acid (GABA) (PubMed:8420981, PubMed:30270321). Can also mediate transport of beta-alanine and to a lower extent that of taurine and hypotaurine (PubMed:8420981, PubMed:30270321). 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, taurine, hypotaurine, beta-guanidinopropionic acid and 2,3-diaminopropionic acid (PubMed:8420981). Beta-alanine transport is inhibited by GABA (PubMed:8420981). Brain. Belongs to the sodium:neurotransmitter symporter (SNF) (TC 2.A.22) family. SLC6A11 subfamily.