A single point mutation in precursor protein VI doubles the mechanical strength of human adenovirus.

A single point mutation in precursor protein VI doubles the mechanical strength of human adenovirus.
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DOI:
10.1007/s10867-017-9479-y
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发表时间:
2018-06
影响因子:
1.8
通讯作者:
Roos WH
Roos WH
中科院分区:
生物学4区
文献类型:
--
作者:
van Rosmalen MGM;Nemerow GR;Wuite GJL;Roos WH

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病毒作为疫苗应用和基因治疗的载体被广泛研究。对于这些应用程序,了解病毒的材料特性对于创建最佳功能至关重要。使用原子力显微镜(AFM)纳米压痕,我们研究了人类腺病毒5型与35型纤维(Ad 5 F35)的机械性能,并将其与蛋白质VI前体蛋白(pVI-S28 C)中具有单点突变的病毒衣壳进行比较。令人惊讶的是,pVI-S28 C突变体的刚性是Ad 5 F35衣壳的两倍。我们认为这种强度的主要增加是前体蛋白VII的DNA交联活性的结果,因为在pVI-S28 C突变衣壳中检测到这种蛋白。两种衣壳的感染性相似,表明突变不影响蛋白VI裂解内体膜的能力。这项研究强调,即使是单点突变,也有可能增加衣壳的机械稳定性,同时不影响病毒的生命周期。这种见解可以帮助开发更稳定的载体用于治疗应用。本文的在线版本(10.1007/s10867-017-9479-y)包含补充材料,可供授权用户使用。
Viruses are extensively studied as vectors for vaccine applications and gene therapies. For these applications, understanding the material properties of viruses is crucial for creating optimal functionality. Using atomic force microscopy (AFM) nanoindentation, we studied the mechanical properties of human adenovirus type 5 with the fiber of type 35 (Ad5F35) and compared it to viral capsids with a single point mutation in the protein VI precursor protein (pVI-S28C). Surprisingly, the pVI-S28C mutant turned out to be twice as stiff as the Ad5F35 capsids. We suggest that this major increase in strength is the result of the DNA crosslinking activity of precursor protein VII, as this protein was detected in the pVI-S28C mutant capsids. The infectivity was similar for both capsids, indicating that mutation did not affect the ability of protein VI to lyse the endosomal membrane. This study highlights that it is possible to increase the mechanical stability of a capsid even with a single point mutation while not affecting the viral life cycle. Such insight can help enable the development of more stable vectors for therapeutic applications. The online version of this article (10.1007/s10867-017-9479-y) contains supplementary material, which is available to authorized users.
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