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A ribonuclease zymogen activated by the NS3 protease of the hepatitis C virus

机译:丙型肝炎病毒的NS3蛋白酶激活的核糖核酸酶酶原

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摘要

Translating proteases as inactive precursors, or zymogens, protects cells from the potentially lethal action of unregulated proteolytic activity. Here, we impose this strategy on bovine pancreatic ribonuclease (RNase A) by creating a zymogen in which quiescent ribonucleolytic activity is activated by the NS3 protease of the hepatitis C virus. Connecting the N-terminus and C-terminus of RNase A with a 14-residue linker was found to diminish its ribonucleolytic activity by both occluding an RNA substrate and dislocating active-site residues, which are devices used by natural zymogens. After cleavage of the linker by the NS3 protease, the ribonucleolytic activity of the RNase A zymogen increased 105-fold. Both before and after activation, the RNase A zymogen displayed high conformational stability and evasion of the endogenous ribonuclease inhibitor protein of the mammalian cytosol. Thus, the creation of ribonuclease zymogens provides a means to control ribonucleolytic activity and has the potential to provide a new class of antiviral chemotherapeutic agents.
机译:将蛋白酶翻译为无活性的前体或酶原,可以保护细胞免受不受调节的蛋白水解活性的潜在致命作用。在这里,我们通过创建一种酶原将这种策略强加于牛胰腺核糖核酸酶(RNase A)上,在该酶原中,静止的核糖核酸分解活性被丙型肝炎病毒的NS3蛋白酶激活。发现将RNase A的N末端和C末端与14个残基的连接子连接会通过封闭RNA底物和使活性位点残基(天然酶原使用的装置)错位而降低其核糖核酸分解活性。在NS3蛋白酶切割连接子后,RNase A酶原的核糖核酸水解活性增加了105倍。在激活之前和之后,RNase A酶原均显示出高构象稳定性,并逃避了哺乳动物细胞溶胶的内源性核糖核酸酶抑制剂蛋白。因此,核糖核酸酶酶原的产生提供了控制核糖核酸溶解活性的手段,并具有提供新型抗病毒化学治疗剂的潜力。

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