Method of producing sulfur-containing amino acid or derivative thereof

A method of producing a sulfur-containing amino acid or a derivative of the sulfur-containing amino acid, the method comprising culturing a genetically modified microorganism in a culture medium including thiosulfate, and recovering the sulfur-containing amino acid or the derivative of the sulfur-containing amino acid from the microorganism or the culture medium,

• wherein the microorganism comprises a genetic modification to increase an expression level of a protein encoded by ssuD gene compared to a non-modified microorganism,
• wherein the production of the sulfur-containing amino acid by the microorganism comprising the genetic modification is increased compared to the non-modified microorganism;
• wherein the protein encoded by the ssuD gene comprises an amino acid sequence having at least 80% sequence identity to SEQ ID NO:
• 43.