1y7l
From Proteopedia
| |||||||
| , resolution 1.55Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Gene: | cysk (Haemophilus influenzae) | ||||||
| Activity: | Cysteine synthase, with EC number 2.5.1.47 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
O-Acetylserine Sulfhydrylase Complex
Overview
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. We have determined the crystal structure of OASS in complex with a C-terminal peptide of SAT required for bienzyme complex formation. The binding site of the peptide is at the active site of OASS, and its C-terminal carboxyl group occupies the same anion binding pocket as the alpha-carboxylate of the O-acetylserine substrate of OASS. These results explain the partial inhibition of OASS by SAT on complex formation as well as the competitive dissociation of the complex by O-acetylserine.
About this Structure
1Y7L is a Protein complex structure of sequences from Haemophilus influenzae. Full crystallographic information is available from OCA.
Reference
The active site of O-acetylserine sulfhydrylase is the anchor point for bienzyme complex formation with serine acetyltransferase., Huang B, Vetting MW, Roderick SL, J Bacteriol. 2005 May;187(9):3201-5. PMID:15838047
Page seeded by OCA on Thu Mar 20 15:19:23 2008
