AbstractA series of thiomercuric derivatives of mono‐ and disaccharides 1–7, in which methylmercury or phenylmercury is covalently attached to anomeric thioglycosides, were synthesized for structure—function studies of glycosidases. Thiomethylmercuryl xylobiosides 5 and 6 were found to inhibit intracellular xylanase‐T6 in a competitive manner, with Ki values of 0.35 mM and 0.01 mM, respectively. These inhibitors have been co‐crystallized with the enzyme and are being used for X‐ray analysis. 1‐(Thiomethylmercuric)‐ß‐D‐xyloside (3) affords crystals belonging to the orthorhombic space group P212121 and at 293(2) K: a = 6.7510(2), b = 9.7140(2), c = 29.4770(9) Å, V = 1933.08(9) Å, Z = 8, R(F2) = 0.0329, and Rw(F2) = 0.0626. There are two molecules (A and B) in the asymmetric unit, and each one shows an almost linear S–Hg–C arrangement. Biological tests on 1–7 indicated that they exhibit potent fungicidal and herbicidal activities.
摘要 合成了一系列
单糖和二糖的
硫代
汞衍
生物1-7,其中
甲基汞或
苯基汞共价连接到
硫代糖苷的异构体上,用于糖苷酶的结构-功能研究。研究发现,
硫代
甲基汞木糖苷 5 和 6 能以竞争方式抑制细胞内的
木聚糖酶-T6,其 Ki 值分别为 0.35 mM 和 0.01 mM。这些
抑制剂已与该酶共同结晶,目前正用于 X 射线分析。1-(Thiomethylmercuric)-ß-D-xyloside (3) 结晶属于正交空间群 P212121,在 293(2) K 时:a = 6.7510(2),b = 9.7140(2),c = 29.4770(9)埃,V = 1933.08(9)埃,Z = 8,R(F2) = 0.0329,Rw(F2) = 0.0626。不对称单元中有两个分子(A 和 B),每个分子几乎都呈线性 S-Hg-C 排列。对 1-7 进行的
生物测试表明,它们具有很强的杀真菌和除草活性。