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• W2893926156 abstract "Lytic transglycosylases (LTs) are bacterial enzymes that catalyze the cleavage of the glycan strands of the bacterial cell wall. The mechanism of this cleavage is a remarkable intramolecular transacetalization reaction, accomplished by an ensemble of active-site residues. Because the LT reaction occurs in parallel with the cell wall bond-forming reactions catalyzed by the penicillin-binding proteins, simultaneous inhibition of both enzymes can be particularly bactericidal to Gram-negative bacteria. The MltE lytic transglycosylase is the smallest of the eight LTs encoded by the Escherichia coli genome. Prior crystallographic and computational studies identified four active-site residues-E64, S73, S75, and Y192-as playing roles in catalysis. Each of these four residues was individually altered by mutation to give four variant enzymes (E64Q, S73A, S75A, and Y192F). All four variants showed reduced catalytic activity [soluble wild type (100%) > soluble Y192F and S75A (both 40%) > S73A (4%) > E64Q (≤1%)]. The crystal structure of each variant protein was determined at the resolution of 2.12 Å for E64Q, 2.33 Å for Y192F, 1.38 Å for S73A, and 1.35 Å for S75A. These variants show alteration of the hydrogen-bond interactions of the active site. Within the framework of a prior computational study of the LT mechanism, we suggest the mechanistic role of these four active-site residues in MltE catalysis." @default.
• W2893926156 created "2018-10-05" @default.
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• W2893926156 date "2018-09-26" @default.
• W2893926156 modified "2023-10-16" @default.
• W2893926156 title "A Structural Dissection of the Active Site of the Lytic Transglycosylase MltE from Escherichia coli" @default.
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• W2893926156 doi "https://doi.org/10.1021/acs.biochem.8b00800" @default.
• W2893926156 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30256085" @default.
• W2893926156 hasPublicationYear "2018" @default.
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