The insect β-N-acetylhexosaminidase OfHex1 from Ostrinia furnacalis (one of the most destructive agricultural pests) has been considered as a promising pesticide target. In this study, a series of novel and readily available ureido thioglycosides were designed and synthesized based on the catalytic mechanism and the co-crystal structures of OfHex1 with substrates. After evaluation via enzyme inhibition experiments, thioglycosides 11c and 15k were found to have inhibitory activities against OfHex1 with the K_i values of 25.6 µM and 53.8 µM, respectively. In addition, all these ureido thioglycosides exhibited high selectivity toward OfHex1 over hOGA and HsHexB (K_i > 100 μM). Furthermore, to investigate the inhibitory mechanism, the possible binding modes of 11c and 15k with OfHex1 were deduced based on molecular docking analysis. This work may provide useful structural starting points for further rational design of potent inhibitors of OfHex1.

β-昆虫ñ从-acetylhexosaminidase OfHex1亚洲玉米螟（最具破坏性的农业害虫之一）已被认为是有希望的农药目标。在这项研究中，基于OfHex1与底物的催化机理和共晶体结构，设计并合成了一系列新颖且易于获得的脲基硫糖苷。通过酶抑制实验评估后，发现硫糖苷11c和15k具有对OfHex1的抑制活性，其K _i值分别为25.6 µM和53.8 µM。此外，所有这些脲基硫代糖苷对hOGA和HsHexB（K _i> 100μM）。此外，为了研究其抑制机理，基于分子对接分析推导了11c和15k与OfHex1的可能结合方式。这项工作可能为进一步合理设计OfHex1抑制剂提供有用的结构起点。