Detection of late intermediates in virus capsid assembly by charge detection mass spectrometry.

Detection of late intermediates in virus capsid assembly by charge detection mass spectrometry.
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DOI:
10.1021/ja411460w
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发表时间:
2014-03-05
影响因子:
15
通讯作者:
Jarrold MF
Jarrold MF
中科院分区:
化学1区
文献类型:
--
作者:
Pierson EE;Keifer DZ;Selzer L;Lee LS;Contino NC;Wang JC;Zlotnick A;Jarrold MF

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将数百个相同的蛋白质组装成二十面体病毒衣壳是分子工程的一项非凡壮举。这是如何发生的,人们知之甚少。在组装反应结束时预计会出现关键中间体,但一直无法检测到它们。在这项工作中,我们已经使用电荷检测质谱法,以确定捕获的中间体,从后期的组装B型肝炎病毒T = 4衣壳,一个复杂的120个蛋白质二聚体。发现了具有104/105、110/111和117/118二聚体的突出中间体。冷冻电镜观察表明中间体是不完整的衣壳,因此处于组装途径上。根据它们的稳定性和动力学可及性,我们提出了合理的结构。具有104个二聚体的突出捕获中间体归因于缺少两个相邻小面的二十面体,111-二聚体物质被分配给缺少单个小面的二十面体,并且具有117个二聚体的中间体被分配给在小面中心缺少三个二聚体的环的衣壳。
The assembly of hundreds of identical proteins into an icosahedral virus capsid is a remarkable feat of molecular engineering. How this occurs is poorly understood. Key intermediates have been anticipated at the end of the assembly reaction, but it has not been possible to detect them. In this work we have used charge detection mass spectrometry to identify trapped intermediates from late in the assembly of the hepatitis B virus T = 4 capsid, a complex of 120 protein dimers. Prominent intermediates are found with 104/105, 110/111, and 117/118 dimers. Cryo-EM observations indicate the intermediates are incomplete capsids and, hence, on the assembly pathway. On the basis of their stability and kinetic accessibility we have proposed plausible structures. The prominent trapped intermediate with 104 dimers is attributed to an icosahedron missing two neighboring facets, the 111-dimer species is assigned to an icosahedron missing a single facet, and the intermediate with 117 dimers is assigned to a capsid missing a ring of three dimers in the center of a facet.
完整膜蛋白复合物的质谱法。
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