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Publication Abstract from PubMed

EstU1 is a unique family VIII carboxylesterase that displays hydrolytic activity towards the amide bond of clinically used beta-lactam antibiotics as well as the ester bond of p-nitrophenyl esters. EstU1 assumes a beta-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 beta-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 beta-lactam antibiotics. This result explains the weak beta-lactamase activity of EstU1 compared with class C beta-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. (c) Proteins 2013;. (c) 2013 Wiley Periodicals, Inc.

Structural basis for the beta-lactamase activity of EstU1, a family VIII carboxylesterase.,Cha SS, Jun An Y, Jeong CS, Kim MK, Jeon JH, Lee CM, Lee HS, Gyun Kang S, Lee JH Proteins. 2013 Jun 5. doi: 10.1002/prot.24334. PMID:23737193^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.