151. Crystal structure-guided design of berberine-based novel chitinase inhibitors.
- Author
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Chen L, Zhu L, Chen J, Chen W, Qian X, and Yang Q
- Subjects
- Amino Acid Sequence, Berberine metabolism, Enzyme Inhibitors metabolism, Humans, Hydrophobic and Hydrophilic Interactions, Molecular Docking Simulation, Protein Binding, Serratia marcescens enzymology, Structure-Activity Relationship, Berberine chemistry, Chitinases antagonists & inhibitors, Enzyme Inhibitors chemistry
- Abstract
Glycoside hydrolase family 18 (GH18) chitinases play an important role in various organisms ranging from bacteria to mammals. Chitinase inhibitors have potential applications as pesticides, fungicides, and anti-asthmatics. Berberine, a plant-derived isoquinoline alkaloid, was previously reported to inhibit against various GH18 chitinases with only moderate K
i values ranging between 20 and 70 μM. In this report, we present for the first time the berberine-complexed crystal structure of Sm ChiB, a model GH18 chitinase from the bacterium Serratia marcescens . Based on the berberine-binding mode, a hydrophobic cavity-based optimisation strategy was developed to increase their inhibitory activity. A series of berberine derivatives were designed and synthesised, and their inhibitory activities against GH18 chitinases were evaluated. The compound 4c showed 80-fold-elevated inhibitory activity against Sm ChiB and the human chitinase hAMCase with Ki values at the sub-micromolar level. The mechanism of improved inhibitory activities was proposed. This work provides a new strategy for developing novel chitinase inhibitors.- Published
- 2020
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