Plays a role in L-cysteine detoxification (PubMed:27435271). May transport both D- and L-serine (By similarity). Transcription induced by L-cysteine (in vivo), under control of DecR. Member of the dlsT(yhaO)-yhaM operon. No change in sensitivity to excess L-cysteine. Cells produce about 15% of wild-type levels of hydrogen sulfide in the presence of excess cysteine. Belongs to the amino acid/polyamine transporter 2 family. SdaC/TdcC subfamily. Truncated N-terminus.