Cryo-EM structure reveals cylindrical nucleocapsids from two polydnaviruses
Archives of virology(2018)
摘要
Bracovirus is one of the two polydnavirus genera. Here, we used a cryo-EM analysis to reveal the near-native morphology of two nucleocapsid-containing model bracoviruses: Microplitis bicoloratus bracovirus (MbBV) and Microplitis mediator bracovirus (MmBV). MbBV and MmBV nucleocapsids have discernable cap structures in two distal regions with relatively high electron density. Adjacent to the end-cap structures are two electron-lucent rings. Some nucleocapsids were uniformly electron-dense and had a distinctive “helix-tail-like structure”. Cryo-EM revealed inconsistent nucleocapsid diameters of 34–69.9 nm in MbBV and 46–69.9 nm in MmBV, and the largest observed cylindrical area length was expanded to 126 nm.
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