The active site of O-acetylserine sulfhydrylase is the anchor point for bienzyme complex formation with serine acetyltransferase.
Huang, B., Vetting, M.W., Roderick, S.L.(2005) J Bacteriol 187: 3201-3205
- PubMed: 15838047 
- DOI: 10.1128/JB.187.9.3201-3205.2005
- Primary Citation of Related Structures:  
1Y7L - PubMed Abstract: 
The biosynthesis of cysteine in bacteria and plants is carried out by a two-step pathway, catalyzed by serine acetyltransferase (SAT) and O-acetylserine sulfhydrylase (OASS; O-acetylserine [thiol] lyase). The aerobic form of OASS forms a tight bienzyme complex with SAT in vivo, termed cysteine synthase ...