Human rhinovirus capsid dynamics is controlled by canyon flexibility.

Human rhinovirus capsid dynamics is controlled by canyon flexibility.
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人类鼻病毒衣壳动力学受峡谷灵活性控制。

DOI:
10.1016/s0042-6822(03)00452-5
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发表时间:
2003
期刊:
影响因子:
3.7
通讯作者:
Smith,ThomasJ
Smith,ThomasJ
中科院分区:
医学3区
文献类型:
--
作者:
Reisdorph,Nichole;Thomas,JohnJ;Katpally,Umesh;Chase,Elaine;Harris,Ken;Siuzdak,Gary;Smith,ThomasJ

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使用纳米液相色谱电喷雾质谱结合有限蛋白水解和同位素标记进行定量酶可及性实验,用于检查在三种抗病毒化合物、中和 Fab 和药物结合腔突变存在下人鼻病毒 (HRV) 衣壳的动态性质。使用这些方法,发现抗病毒药物 WIN 52084 和 picovir (pleconaril) 可以稳定衣壳,而丹磺酰氮丙啶会导致不稳定。研究发现,药物结合腔中的定点突变可以稳定 HRV14 衣壳,使其免受蛋白水解消化,其方式与 WIN 52084 和 pleconaril 类似。还观察到与 NIm-IA 抗原位点结合并穿透峡谷的抗体可以保护病毒体免受蛋白水解切割。这些结果表明,量化抗病毒配体对蛋白质“呼吸”的影响可用于比较它们的作用模式和功效。在这种情况下,显然疏水性抗病毒剂、抗体或峡谷区域的突变会阻止病毒呼吸。因此,这些研究表明峡谷区域的流动性是衣壳呼吸的主要决定因素。
Quantitative enzyme accessibility experiments using nano liquid chromatography electrospray mass spectrometry combined with limited proteolysis and isotope-labeling was used to examine the dynamic nature of the human rhinovirus (HRV) capsid in the presence of three antiviral compounds, a neutralizing Fab, and drug binding cavity mutations. Using these methods, it was found that the antivirals WIN 52084 and picovir (pleconaril) stabilized the capsid, while dansylaziridine caused destabilization. Site-directed mutations in the drug-binding cavity were found to stabilize the HRV14 capsid against proteolytic digestion in a manner similar to WIN 52084 and pleconaril. Antibodies that bind to the NIm-IA antigenic site and penetrate the canyon were also observed to protect the virion against proteolytic cleavage. These results demonstrate that quantifying the effects of antiviral ligands on protein “breathing” can be used to compare their mode of action and efficacy. In this case, it is apparent that hydrophobic antiviral agents, antibodies, or mutations in the canyon region block viral breathing. Therefore, these studies demonstrate that mobility in the canyon region is a major determinant in capsid breathing.
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