5o9r
Crystal structure of ScGas2 in complex with compound 9
Structural highlights
FunctionGAS2_YEAST Splits internally a 1,3-beta-glucan molecule and transfers the newly generated reducing end (the donor) to the non-reducing end of another 1,3-beta-glucan molecule (the acceptor) forming a 1,3-beta linkage, resulting in the elongation of 1,3-beta-glucan chains in the cell wall. Involved in spore wall assembly.[1] [2] Publication Abstract from PubMedFungal beta-1,3-glucan glucanosyltransferases are glucan-remodeling enzymes that play important roles in cell wall integrity, and are essential for the viability of pathogenic fungi and yeasts. As such, they are considered possible drug targets, although inhibitors of this class of enzymes have not yet been reported. Herein we report a multidisciplinary approach based on a structure-guided design using a highly conserved transglycosylase from Sacharomyces cerevisiae, that leads to carbohydrate derivatives with high affinity for Aspergillus fumigatus Gel4. We demonstrate by X-ray crystallography that the compounds bind in the active site of Gas2/Gel4 and interact with the catalytic machinery. The topological analysis of noncovalent interactions demonstrates that the combination of a triazole with positively charged aromatic moieties are important for optimal interactions with Gas2/Gel4 through unusual pyridinium cation-pi and face-to-face pi-pi interactions. The lead compound is capable of inhibiting AfGel4 with an IC50 value of 42 mum. Inhibitors against Fungal Cell Wall Remodeling Enzymes.,Delso I, Valero-Gonzalez J, Gomollon-Bel F, Castro-Lopez J, Fang W, Navratilova I, van Aalten DMF, Tejero T, Merino P, Hurtado-Guerrero R ChemMedChem. 2018 Jan 22;13(2):128-132. doi: 10.1002/cmdc.201700720. Epub 2017, Dec 12. PMID:29164827[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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