Biochemical Strategy to Avert Microbial Drug Resistance

项目摘要/摘要 拟议研究的目标是开发一种可推广的抗菌策略。 这避免了耐药性的发生。建议的抗病毒药物的机制是 依赖于致病蛋白质的功能而不是其抑制作用的作用。 具体地说，该试剂是一种人体酶的细胞毒性变体，核糖核酸酶1 (核糖核酸酶1)，它是被遮盖的，因此作为催化剂没有活性。斗篷只有通过以下方式才能取下 在病原体的生命周期中必不可少的一种致病蛋白酶。SARS-CoV-2将 在这项研究中作为模型病原体。该目标将通过(1)确定一个 SARS-CoV-2 3CLPro酶切割BUT的最佳氨基酸序列 不是通过内源性的人蛋白酶，(2)使用该序列和内含素介导的顺式- 剪接以创建环RNase1酶原，以及(3)展示了 酶原杀死表达3CLPro并感染3CLPro的人肺细胞 SARS-CoV-2。因为被激活的酶原也会破坏RNA的基因组 像SARS-CoV-2这样的病毒，它可以根除患者的病毒库。一个显著的特点 这一策略的特点是它的模块化：蛋白酶裂解序列是一个盒式磁带，可以 改变以匹配致病蛋白酶治疗其他疾病的特异性 传染病。

PROJECT SUMMARY/ABSTRACT The goal of the proposed research is to develop a generalizable antimicrobial strategy that averts the onset of resistance. The proposed antiviral agent has a mechanism of action that relies on the function of a pathogenic protein rather than its inhibition. Specifically, the agent is a cytotoxic variant of a human enzyme, ribonuclease 1 (RNase 1), that is cloaked and thus inactive as a catalyst. The cloak is removable only by a pathogenic protease that is essential for the lifecycle of the pathogen. SARS-CoV-2 will serve as a model pathogen in the study. The goal will be attained by (1) identifying an optimal amino acid sequence that is cleaved by the 3CLpro protease of SARS-CoV-2 but not by endogenous human proteases, (2) using that sequence and intein-mediated cis- splicing to create a cyclic RNase 1 zymogen, and (3) demonstrating the ability of the zymogen to kill human lung cells that express 3CLpro and that are infected by SARS-CoV-2. Because the activated zymogen can also destroy the genome of an RNA virus like SARS-CoV-2, it could eradicate the viral reservoir in patients. A notable feature of the strategy is its modularity: the protease-cleavage sequence is a cassette that can be altered to match the specificity of pathogenic proteases for the treatment of other infectious diseases.