类别:有毒物质
可燃性危险特性:不燃
储运特性:应存放在低温、通风和干燥的库房中
灭火剂:可用水、二氧化碳、干粉或砂土进行灭火
It has been accepted dogma that eukaryotes and heme-synthesizing bacteria use the same metabolic intermediates in their heme synthesis pathways, where protoporphyrin is the final intermediate into which iron is inserted to make protoheme. Herein, we present data demonstrating that Gram-positive bacteria do not use protoporphyrin as an intermediate but, instead, have an altered set of terminal reactions that oxidize coproporphyrinogen to coproporphyrin and insert ferrous iron into coproporphyrin, resulting in the formation of coproheme. A newly characterized enzyme, HemQ, decarboxylates coproheme to generate protoheme. Because some organisms that possess this coproporphyrin-dependent branch are major causes of human disease, HemQ is a novel pharmacological target of significant therapeutic relevance, particularly given high rates of antimicrobial resistance among these pathogens.
长期以来,普遍认为真核生物和合成血红素的细菌在其合成途径中使用相同的代谢中间体,原卟啉是其中的最终中间体,铁被插入其中以形成原血红素。本文提供的数据表明,革兰氏阳性细菌不使用原卟啉作为中间体,而是有一组改变的终端反应,将卟啉原半胱氨酸酯氧化为卟啉原,然后将亚铁离子插入卟啉原中,形成卟胺血红素。一种新鉴定的酶HemQ将卟胺血红素脱羧生成原血红素。由于一些拥有这种卟胺血红素依赖分支的生物是人类疾病的主要原因,因此HemQ是一个具有显著治疗意义的新型药物靶点,特别是考虑到这些病原体中高抗微生物药物的发生率。