The Preparation of Some Substituted Thiohydantoins and Thioimidazoles
作者:Mary Jackman、Mabel Klenk、B. Fishburn、B. F. Tullar、S. Archer
DOI:10.1021/ja01189a015
日期:1948.9
It has been shown that proper substitution a t the six position in 2-thiouracil resulted in increased antithyroid activity.' Astwood showed that 2thiohydantoin was half and 2-thioimidazole one and one half times as active as 2-thiouracil in goitrogenic potency.2 It seemed likely then that appropriately substituted thiohydantoins and thioimidazoles would show greater activity than the parent heterocycles
Reactivity of an Unusual Amidase May Explain Colibactin’s DNA Cross-Linking Activity
作者:Yindi Jiang、Alessia Stornetta、Peter W. Villalta、Matthew R. Wilson、Paul D. Boudreau、Li Zha、Silvia Balbo、Emily P. Balskus
DOI:10.1021/jacs.9b02453
日期:2019.7.24
DNA, the molecular basis for cross-link formation is unclear. Here, we report that the colibactin biosynthetic enzyme ClbL is an amide bond-forming enzyme that links aminoketone and β-keto thioester substrates in vitro and in vivo. The substrate specificity of ClbL strongly supports a role for this enzyme in terminating the colibactin NRPS-PKS assembly line and incorporating twoelectrophilic cyclopropane
某些共生细菌和病原细菌会产生大肠杆菌素,这是一种小分子基因毒素,可引起宿主细胞 DNA 链间交联。尽管大肠杆菌素使 DNA 烷基化,但交联形成的分子基础尚不清楚。在这里,我们报道了大肠杆菌素生物合成酶 ClbL 是一种酰胺键形成酶,可在体外和体内连接氨基酮和 β-酮硫酯底物。ClbL 的底物特异性强烈支持该酶在终止大肠杆菌素 NRPS-PKS 组装线并将两个亲电环丙烷弹头合并到最终天然产物支架中的作用。检测到大肠杆菌素衍生的交联 DNA 加合物支持了这一提议的转化。总体而言,这项工作为大肠杆菌素的DNA交联活性提供了生物合成解释,并为进一步研究其化学结构和生物学作用铺平了道路。
Pascual; Masso, Anales de la Real Sociedad Espanola de Fisica y Quimica, 1952, vol. <B> 48, p. 155,160
作者:Pascual、Masso
DOI:——
日期:——
Pascual Vila; Halcon, Anales de la Real Sociedad Espanola de Fisica y Quimica, 1935, vol. 33, p. 812
作者:Pascual Vila、Halcon
DOI:——
日期:——
Synthesis of amino acids and related compounds. 6. New convenient synthesis of .alpha.-C-acylamino acids and .alpha.-amino ketones