9fdd is a 8 chain structure with sequence from Klebsiella. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
CYSB_KLEPN This protein is a positive regulator of gene expression for the cysteine regulon. The inducer for CysB is N-acetylserine. Thiosulfate and sulfide act as anti-inducers.