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Dahmane I, Montagner C, Matagne A, Dumbre S, Herdewijn P, Terrak M. Peptidoglycan glycosyltransferase-ligand binding assay based on tryptophan fluorescence quenching. Biochimie 2018; 152:1-5. [PMID: 29909047 DOI: 10.1016/j.biochi.2018.06.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 06/13/2018] [Indexed: 11/28/2022]
Abstract
Peptidoglycan glycosyltransferases (GTase) of family 51 are essential enzymes for the synthesis of the glycan chains of the bacterial cell wall. They are considered potential antibacterial target, but discovery of inhibitors was hampered so far by the lack of efficient and affordable screening assay. Here we used Staphylococcus aureus MtgA to introduce a single tryptophan reporter residue in selected positions flanking the substrates binding cavity of the protein. We selected a mutant (Y181W) that shows strong fluorescence quenching in the presence of moenomycin A and two lipid II analogs inhibitors. The assay provides a simple method to study GTase-ligand interactions and can be used as primary high throughput screening of GTase inhibitors without the need for lipid II substrate or reporter ligands.
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Affiliation(s)
- Ismahene Dahmane
- Centre d'Ingénierie des Protéines-InBioS, University of Liège, B6a, Quartier Agora, Allée du six Août 11, 4000, Liège 1, Belgium
| | - Caroline Montagner
- Centre d'Ingénierie des Protéines-InBioS, University of Liège, B6a, Quartier Agora, Allée du six Août 11, 4000, Liège 1, Belgium
| | - André Matagne
- Centre d'Ingénierie des Protéines-InBioS, University of Liège, B6a, Quartier Agora, Allée du six Août 11, 4000, Liège 1, Belgium
| | - Shrinivas Dumbre
- Laboratory of Medicinal Chemistry, Rega Institute for Medical Research, University of Leuven, Belgium
| | - Piet Herdewijn
- Laboratory of Medicinal Chemistry, Rega Institute for Medical Research, University of Leuven, Belgium
| | - Mohammed Terrak
- Centre d'Ingénierie des Protéines-InBioS, University of Liège, B6a, Quartier Agora, Allée du six Août 11, 4000, Liège 1, Belgium.
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Bury D, Dahmane I, Derouaux A, Dumbre S, Herdewijn P, Matagne A, Breukink E, Mueller-Seitz E, Petz M, Terrak M. Positive cooperativity between acceptor and donor sites of the peptidoglycan glycosyltransferase. Biochem Pharmacol 2014; 93:141-50. [PMID: 25462814 DOI: 10.1016/j.bcp.2014.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 11/07/2014] [Accepted: 11/07/2014] [Indexed: 12/01/2022]
Abstract
The glycosyltransferases of family 51 (GT51) catalyze the polymerization of lipid II to form linear glycan chains, which, after cross linking by the transpeptidases, form the net-like peptidoglycan macromolecule. The essential function of the GT makes it an attractive antimicrobial target; therefore a better understanding of its function and its mechanism of interaction with substrates could help in the design and the development of new antibiotics. In this work, we have used a surface plasmon resonance Biacore(®) biosensor, based on an amine derivative of moenomycin A immobilized on a sensor chip surface, to investigate the mechanism of binding of substrate analogous inhibitors to the GT. Addition of increasing concentrations of moenomycin A to the Staphylococcus aureus MtgA led to reduced binding of the protein to the sensor chip as expected. Remarkably, in the presence of low concentrations of the most active disaccharide inhibitors, binding of MtgA to immobilized moenomycin A was found to increase; in contrast competition with moenomycin A occurred only at high concentrations. This finding suggests that at low concentrations, the lipid II analogs bind to the acceptor site and induce a cooperative binding of moenomycin A to the donor site. Our results constitute the first indication of the existence of a positive cooperativity between the acceptor and the donor sites of peptidoglycan GTs. In addition, our study indicates that a modification of two residues (L119N and F120S) within the hydrophobic region of MtgA can yield monodisperse forms of the protein with apparently no change in its secondary structure content, but this is at the expense of the enzyme function.
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Affiliation(s)
- Daniel Bury
- Department of Food Chemistry, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaussstr. 20, 42119 Wuppertal, Germany.
| | - Ismahene Dahmane
- Centre d'Ingénierie des Protéines, Université de Liège, Allée de la Chimie, B6a, B-4000, Sart Tilman, Liège, Belgium
| | - Adeline Derouaux
- Centre d'Ingénierie des Protéines, Université de Liège, Allée de la Chimie, B6a, B-4000, Sart Tilman, Liège, Belgium
| | - Shrinivas Dumbre
- Laboratory of Medicinal Chemistry, Rega Institute for Medical Research, University of Leuven, Leuven, Belgium
| | - Piet Herdewijn
- Laboratory of Medicinal Chemistry, Rega Institute for Medical Research, University of Leuven, Leuven, Belgium
| | - André Matagne
- Centre d'Ingénierie des Protéines, Université de Liège, Allée de la Chimie, B6a, B-4000, Sart Tilman, Liège, Belgium
| | - Eefjan Breukink
- Membrane Biochemistry and Biophysics, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Erika Mueller-Seitz
- Department of Food Chemistry, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaussstr. 20, 42119 Wuppertal, Germany
| | - Michael Petz
- Department of Food Chemistry, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaussstr. 20, 42119 Wuppertal, Germany
| | - Mohammed Terrak
- Centre d'Ingénierie des Protéines, Université de Liège, Allée de la Chimie, B6a, B-4000, Sart Tilman, Liège, Belgium.
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