Alphavirus Particles Can Assemble with an Alternate Triangulation Number.

Alphavirus Particles Can Assemble with an Alternate Triangulation Number.
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DOI:
10.3390/v14122650
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发表时间:
2022-11-27
期刊:
Viruses
影响因子:
--
通讯作者:
--
中科院分区:
其他
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--
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甲病毒是球形包膜RNA病毒,主要由蚊子传播,在人类和牲畜中引起严重的关节炎性和嗜神经性疾病。先前的报告表明,与典型的二十面体病毒相比,甲病毒含有常见的缺陷,这些缺陷可能在病毒生命周期中发挥重要作用。通过发现东部马脑炎病毒(EEEV)颗粒的另一种结构,我们证实了活病毒颗粒在全属范围内的多形性,并扩展了我们对甲病毒组装的理解。交替的T = 3二十面体结构与典型甲型病毒的经典T = 4二十面体结构在三角化数量上有所不同,但交替的结构保持了不对称单元的准等价关系。融合刺突糖蛋白更松散地以T = 3形式对立,其底层衣壳蛋白晶格相应发生变化。这种替代结构可以潜在地用于工程基于α病毒的颗粒,以传递α病毒或其他RNA。
Alphaviruses are spherical, enveloped RNA viruses primarily transmitted by mosquitoes, and cause significant arthritogenic and neurotropic disease in humans and livestock. Previous reports have shown that—in contrast to prototypical icosahedral viruses—alphaviruses incorporate frequent defects, and these may serve important functions in the viral life cycle. We confirm the genus-wide pleomorphism in live viral particles and extend our understanding of alphavirus assembly through the discovery of an alternate architecture of Eastern equine encephalitis virus (EEEV) particles. The alternate T = 3 icosahedral architecture differs in triangulation number from the classic T = 4 icosahedral organization that typifies alphaviruses, but the alternate architecture maintains the quasi-equivalence relationship of asymmetric units. The fusion spike glycoproteins are more loosely apposed in the T = 3 form with corresponding changes in the underlying capsid protein lattice. This alternate architecture could potentially be exploited in engineering alphavirus-based particles for delivery of alphaviral or other RNA.
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