1RYY
Acetobacter turbidans alpha-amino acid ester hydrolase Y206A mutant
Summary for 1RYY
| Entry DOI | 10.2210/pdb1ryy/pdb |
| Descriptor | alpha-amino acid ester hydrolase (2 entities in total) |
| Functional Keywords | alpha/beta hydrolase fold, jellyroll fold, hydrolase |
| Biological source | Acetobacter pasteurianus |
| Total number of polymer chains | 8 |
| Total formula weight | 582843.00 |
| Authors | Barends, T.R.M. (deposition date: 2003-12-23, release date: 2005-02-22, Last modification date: 2024-02-14) |
| Primary citation | Barends, T.R.M.,Polderman-Tijmes, J.J.,Jekel, P.A.,Williams, C.,Wybenga, G.,Janssen, D.B.,Dijkstra, B.W. Acetobacter turbidans {alpha}-Amino Acid Ester Hydrolase: HOW A SINGLE MUTATION IMPROVES AN ANTIBIOTIC-PRODUCING ENZYME. J.Biol.Chem., 281:5804-5810, 2006 Cited by PubMed Abstract: The alpha-amino acid ester hydrolase (AEH) from Acetobacter turbidans is a bacterial enzyme catalyzing the hydrolysis and synthesis of beta-lactam antibiotics. The crystal structures of the native enzyme, both unliganded and in complex with the hydrolysis product D-phenylglycine are reported, as well as the structures of an inactive mutant (S205A) complexed with the substrate ampicillin, and an active site mutant (Y206A) with an increased tendency to catalyze antibiotic production rather than hydrolysis. The structure of the native enzyme shows an acyl binding pocket, in which D-phenylglycine binds, and an additional space that is large enough to accommodate the beta-lactam moiety of an antibiotic. In the S205A mutant, ampicillin binds in this pocket in a non-productive manner, making extensive contacts with the side chain of Tyr(112), which also participates in oxyanion hole formation. In the Y206A mutant, the Tyr(112) side chain has moved with its hydroxyl group toward the catalytic serine. Because this changes the properties of the beta-lactam binding site, this could explain the increased beta-lactam transferase activity of this mutant. PubMed: 16377627DOI: 10.1074/jbc.M511187200 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.8 Å) |
Structure validation
Download full validation report
