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α-L-fucosidase inhibition by pyrrolidine-ferrocene hybrids: Rationalization of ligand-binding properties by structural studies

机译:吡咯烷-二茂铁杂种抑制α-L-岩藻糖苷酶:通过结构研究合理化配体结合特性

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摘要

Enhanced metabolism of fucose through fucosidase overexpression is a signature of some cancer types, thus suggesting that fucosidase-targetted ligands could play the role of drug-delivery vectors. Herein, we describe the synthesis of a new series of pyrrolidine-ferrocene conjugates, consisting of a L-fuco-configured dihydroxypyrrolidine as the fucosidase ligand armed with a cytotoxic ferrocenylamine moeity. Three-dimensional structures of several of these fucosidase inhibitors reveal transition-state-mimicking ~3E conformations. Elaboration with the ferrocenyl moiety results in sub-micromolar inhibitors of both bovine and bacterial fucosidases, with the 3D structure of the latter revealing electron density indicative of highly mobile alkylferrocene compounds. The best compounds show a strong antiproliferative effect, with up to 100 % inhibition of the proliferation of MDA-MB-231 cancer cells at 50 μM. Transition-state-mimicking ~3E conformations (see picture) are evident from the three-dimensional structures of ferrocenyl iminosugar/ fucosidase complexes. Novel pyrrolidine-ferrocene conjugates show strong anti-fucosidase and antiproliferative action, with up to 100 % inhibition of proliferation of an MDA-MB-231 cancer-cell line at 50 μM.
机译:通过岩藻糖苷酶过表达增强岩藻糖的代谢是某些癌症类型的标志,因此表明以岩藻糖苷酶为靶标的配体可以发挥药物递送载体的作用。在本文中,我们描述了一系列新的吡咯烷-二茂铁结合物的合成,该结合物由L-fuco构型的二羟基吡咯烷作为岩藻糖苷酶配体组成,具有细胞毒性二茂铁基胺部分。这些岩藻糖苷酶抑制剂中的几种的三维结构揭示了模拟过渡态的〜3E构象。用二茂铁基部分进行精制会产生牛和细菌岩藻糖苷酶的亚微摩尔抑制剂,后者的3D结构显示出电子密度高,表明烷基二茂铁化合物具有高度的移动性。最好的化合物显示出强大的抗增殖作用,在50μM浓度下对MDA-MB-231癌细胞的增殖具有高达100%的抑制作用。从二茂铁基亚氨基糖/岩藻糖苷酶复合物的三维结构中可以明显看出类似过渡态的〜3E构象(见图)。新型吡咯烷-二茂铁结合物显示出强大的抗岩藻糖苷酶和抗增殖作用,在50μM浓度下对MDA-MB-231癌细胞系的增殖抑制高达100%。

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