An unexpected vestigial protein complex reveals the evolutionary origins of an s-triazine catabolic enzyme
作者:Lygie Esquirol、Thomas S. Peat、Matthew Wilding、Jian-Wei Liu、Nigel G. French、Carol J. Hartley、Hideki Onagi、Thomas Nebl、Christopher J. Easton、Janet Newman、Colin Scott
DOI:10.1074/jbc.ra118.001996
日期:2018.5
the suicide inhibitor phenyl phosphorodiamidate revealed that the AtzE enzyme complex consists of two independent molecules in the asymmetric unit. We also show that AtzE forms an α2β2 heterotetramer with a previously unidentified 68-amino acid-long protein (AtzG) encoded in the cyanuric acid mineralization operon from Pseudomonas sp. strain ADP. Moreover, we observed that AtzG is essential for the production
三聚氰酸是s-三嗪的代谢中间体,例如阿特拉津(一种常见的除草剂)和三聚氰胺(用于树脂和塑料中)。土壤细菌假单胞菌(Pseudomonas sp。)将氰尿酸矿化为氨和二氧化碳。通过三种水解酶(AtzD,AtzE和AtzF)获得ADP菌株。在这里,我们报告AtzE的纯化,生化和结构表征。与以前的报告相反,我们发现AtzE不是缩二脲酰胺水解酶,而是催化1-羧基缩二脲的水解脱氨反应。载脂蛋白AtzE和AtzE的X射线晶体结构与自杀抑制剂苯基二氨基磷酸酯结合显示,AtzE酶复合物由不对称单元中的两个独立分子组成。我们还显示AtzE与先前未鉴定的在假单胞菌属物种的氰尿酸矿化操纵子中编码的68个氨基酸长的蛋白(AtzG)形成了一个α2β2异四聚体。菌株ADP。此外,我们观察到AtzG对于可溶性,活性AtzE的产生是必不可少的,这种专心的相互作用是它们共同进化起源的遗迹。我们建议AtzEG可能是从祖先的谷