6jaw

Crystal structure of Ostrinia furnacalis Group II chitinase catalytic domain 1 in complex with a napthalimide derivative

spinqualitylabelsall models 6jaw, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6jaw is a 1 chain structure with sequence from Ostrinia furnacalis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.981Å Ligands: BBO, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Small-molecule inhibitors of insect chitinases have potential applications for controlling insect pests. Insect group II chitinase (ChtII) is the most important chitinase in insects and functions throughout all developmental stages. However, the possibility of inhibiting ChtII by small molecules has not been explored yet. Here, we report the structural characteristics of four molecules that exhibited similar levels of inhibitory activity against OfChtII, a group II chitinase from the agricultural pest Asian corn borer (Ostrinia furnacalis). These inhibitors were chitooctaose (GlcN)8, dipyrido-pyrimidine derivative (DP), piperidine-thienopyridine derivative (PT), and naphthalimide derivative (NI). The crystal structures of the OfChtII catalytic domain complexed with each of the four inhibitors at 1.4~2.0 A resolutions suggested they all exhibit similar binding modes within the substrate-binding cleft; specifically, two hydrophobic groups of the inhibitor interact with +1/+2 tryptophan and a -1 hydrophobic pocket. The structure of the (GlcN)8 complex surprisingly revealed that the oligosaccharide chain of the inhibitor is orientated in the opposite direction to that previously observed in complexes with other chitinases. Injection of the inhibitors into 4th-instar O. furnacalis larvae led to defects in development and pupation. The results of this study provide insights into a general mechanistic principle that confers inhibitory activity against ChtII, which could facilitate rational design of agrochemicals that target ecdysis of insect pests. Structural dissection reveals a general mechanistic principle for group II chitinase (ChtII) inhibition.,Chen W, Zhou Y, Yang Q J Biol Chem. 2019 May 3. pii: RA119.007812. doi: 10.1074/jbc.RA119.007812. PMID:31053640 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Chitinase 3D structures

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