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Structural basis for the β-lactamase activity of EstU1, a family VIII carboxylesterase
- Source :
- Proteins: Structure, Function, and Bioinformatics. 81:2045-2051
- Publication Year :
- 2013
- Publisher :
- Wiley, 2013.
-
Abstract
- EstU1 is a unique family VIII carboxylesterase that displays hydrolytic activity toward the amide bond of clinically used β-lactam antibiotics as well as the ester bond of p-nitrophenyl esters. EstU1 assumes a β-lactamase-like modular architecture and contains the residues Ser100, Lys103, and Tyr218, which correspond to the three catalytic residues (Ser64, Lys67, and Tyr150, respectively) of class C β-lactamases. The structure of the EstU1/cephalothin complex demonstrates that the active site of EstU1 is not ideally tailored to perform an efficient deacylation reaction during the hydrolysis of β-lactam antibiotics. This result explains the weak β-lactamase activity of EstU1 compared with class C β-lactamases. Finally, structural and sequential comparison of EstU1 with other family VIII carboxylesterases elucidates an operative molecular strategy used by family VIII carboxylesterases to extend their substrate spectrum. Proteins 2013; 81:2045–2051. © 2013 Wiley Periodicals, Inc.
Details
- ISSN :
- 08873585
- Volume :
- 81
- Database :
- OpenAIRE
- Journal :
- Proteins: Structure, Function, and Bioinformatics
- Accession number :
- edsair.doi...........5d49a1366fcd5398381424561a916f2c
- Full Text :
- https://doi.org/10.1002/prot.24334