Download MendeleyAnalysis of the Reaction Coordinate of Alpha-L-Fucosidases: A Combined Structural and Quantum Mechanical Approach
Lammerts Van Bueren, A., Ardevol, A., Fayers-Kerr, J., Luo, B., Zhang, Y., Sollogoub, M., Bleriot, Y., Rovira, C., Davies, G.J.(2010) J Am Chem Soc 132: 1804
- PubMed: 20092273
- DOI: https://doi.org/10.1021/ja908908q
- Primary Citation of Related Structures:
2WVS, 2WVT, 2WVU, 2WVV - PubMed Abstract:
The enzymatic hydrolysis of alpha-L-fucosides is of importance in cancer, bacterial infections, and fucosidosis, a neurodegenerative lysosomal storage disorder. Here we show a series of snapshots along the reaction coordinate of a glycoside hydrolase family GH29 alpha-L-fucosidase unveiling a Michaelis (ES) complex in a (1)C(4) (chair) conformation and a covalent glycosyl-enzyme intermediate in (3)S(1) (skew-boat). First principles metadynamics simulations on isolated alpha-L-fucose strongly support a (1)C(4)<-->(3)H(4)<-->(3)S(1) conformational itinerary for the glycosylation step of the reaction mechanism and indicate a strong "preactivation" of the (1)C(4) complex to nucleophilic attack as reflected by free energy, C1-O1/O5-C1 bond length elongation/reduction, C1-O1 bond orientation, and positive charge development around the anomeric carbon. Analysis of an imino sugar inhibitor is consistent with tight binding of a chair-conformed charged species.
Organizational Affiliation:
York Structural Biology Laboratory, Department of Chemistry, The University of York, York YO10 5YW, UK.
