NAG-thiazoline is a strong competitive inhibitor of GH20 β-N-acetyl- hexosaminidases and GH84 β-N-acetylglucosaminidases. Here, we focused on the design, synthesis and inhibition potency of a series of new derivatives of NAG-thiazoline modified at the C-6 position. Dimerization of NAG-thiazoline via C-6 attached triazole linkers prepared by click chemistry was employed to make use of multivalency in the inhibition. Novel compounds were tested as potential inhibitors of β-N-acetylhexosaminidases from Talaromyces flavus, Streptomyces plicatus (both GH20) and β-N-acetylglucosaminidases from Bacteroides thetaiotaomicron and humans (both GH84). From the set of newly prepared NAG-thiazoline derivatives, only C-6-azido-NAG-thiazoline displayed inhibition activity towards these enzymes; C-6 triazole-substituted NAG-thiazolines lacked inhibition activity against the enzymes used. Docking of C-6-azido-NAG-thiazoline into the active site of the tested enzymes was performed. Moreover, a stability study with GlcNAc-thiazoline confirmed its decomposition at pH < 6 yielding 2-acetamido-2-deoxy-1-thio-α/β-D-glucopyranoses, which presumably dimerize oxidatively into S-S linked dimers; decomposition products of NAG-thiazoline are void of inhibitory activity.
NAG-thiazoline 是 GH20 β-N-乙酰
氨基己糖苷酶和 GH84 β-
N-乙酰氨基葡萄糖苷酶的强竞争
抑制剂。本研究集中于设计、合成和一系列新衍
生物的抑制活性,这些衍
生物在 C-6 位置进行了修改。通过点击
化学合成的 C-6 连接的
叠氮烯烃连接体,NAG-thiazoline 的二聚体化被用来利用多价性进行抑制。新化合物被测试为来自 Talaromyces flavus 和 Streptomyces plicatus(均为 GH20)以及来自 Bacteroides thetaiotaomicron 和人类(均为 GH84)的 β-N-乙酰
氨基己糖苷酶的潜在
抑制剂。在新合成的 NAG-thiazoline 衍
生物中,只有 C-6-
叠氮-NAG-thiazoline 表现出对这些酶的抑制活性;C-6
叠氮取代的 NAG-thiazoline 对所用酶缺乏抑制活性。对 C-6-
叠氮-NAG-thiazoline 进⾏了对测试酶活性位点的对接。此外,GlcNAc-thiazoline 的稳定性研究证实其在 pH < 6 时会分解,生成 2-乙酰氨基-2-脱氧-1-硫-α/β-D-葡萄糖
吡喃糖,这可能会氧化二聚化为 S-S 连接的二聚体;NAG-thiazoline 的分解产物不具抑制活性。