Functional Information from GO Data
| Chain | GOid | namespace | contents | 
| A | 0004124 | molecular_function | cysteine synthase activity | 
| A | 0005737 | cellular_component | cytoplasm | 
| A | 0006535 | biological_process | cysteine biosynthetic process from serine | 
| A | 0008652 | biological_process | amino acid biosynthetic process | 
| A | 0016740 | molecular_function | transferase activity | 
| A | 0019344 | biological_process | cysteine biosynthetic process | 
Functional Information from PDB Data
| site_id | AC1 | 
| Number of Residues | 11 | 
| Details | BINDING SITE FOR RESIDUE CYS A 401 | 
| Chain | Residue | 
| A | LYS46 | 
| A | CYS402 | 
| A | PLP403 | 
| A | THR74 | 
| A | SER75 | 
| A | ASN77 | 
| A | THR78 | 
| A | MET125 | 
| A | GLN147 | 
| A | PHE148 | 
| A | GLY225 | 
| site_id | AC2 | 
| Number of Residues | 9 | 
| Details | BINDING SITE FOR RESIDUE CYS A 402 | 
| Chain | Residue | 
| A | SER75 | 
| A | MET101 | 
| A | MET125 | 
| A | ILE223 | 
| A | GLN224 | 
| A | GLY225 | 
| A | ILE226 | 
| A | ALA228 | 
| A | CYS401 | 
| site_id | AC3 | 
| Number of Residues | 20 | 
| Details | BINDING SITE FOR RESIDUE PLP A 403 | 
| Chain | Residue | 
| A | LYS46 | 
| A | ASN77 | 
| A | GLY179 | 
| A | VAL180 | 
| A | GLY181 | 
| A | THR182 | 
| A | GLY183 | 
| A | GLY184 | 
| A | THR185 | 
| A | GLN224 | 
| A | GLY225 | 
| A | ILE226 | 
| A | SER269 | 
| A | PRO296 | 
| A | TYR302 | 
| A | CYS401 | 
| A | HOH521 | 
| A | HOH541 | 
| A | HOH550 | 
| A | HOH601 | 
Functional Information from PROSITE/UniProt
| site_id | PS00901 | 
| Number of Residues | 19 | 
| Details | CYS_SYNTHASE Cysteine synthase/cystathionine beta-synthase P-phosphate attachment site. KlEsmn.PAaSVKdRiGvsM | 
| Chain | Residue | Details | 
| A | LYS35-MET53 |  |