2b9v

Acetobacter turbidans alpha-amino acid ester hydrolaseAcetobacter turbidans alpha-amino acid ester hydrolase

Structural highlights 2b9v is a 16 chain structure with sequence from "acetobacter_acidum-mucosum"_(sic)_tosic_and_walker_1950 "acetobacter acidum-mucosum" (sic) tosic and walker 1950. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: aehA ("Acetobacter acidum-mucosum" (sic) Tosic and Walker 1950) Activity: Alpha-amino-acid esterase, with EC number 3.1.1.43 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Warning: this is a large structure, and loading might take a long time or not happen at all. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed 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. Acetobacter turbidans alpha-amino acid ester hydrolase: how a single mutation improves an antibiotic-producing enzyme.,Barends TR, Polderman-Tijmes JJ, Jekel PA, Williams C, Wybenga G, Janssen DB, Dijkstra BW J Biol Chem. 2006 Mar 3;281(9):5804-10. Epub 2005 Dec 23. PMID:16377627 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 2b9v, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image