Abstract:
:Adenoviruses (Ads) infect hosts from all vertebrate species and have been investigated as vaccine vectors. We report here near-atomic structures of two bovine Ad type 3 (BAd3) intermediates obtained by cryo-electron microscopy. A comparison between the two intermediate structures reveals that the differences are localized in the fivefold vertex region, while their facet structures are identical. The overall facet structure of BAd3 exhibits a similar structure to human Ads; however, BAd3 protein IX has a unique conformation. Mass spectrometry and cryo-electron tomography analyses indicate that one intermediate structure represents the stage during DNA encapsidation, whilst the other intermediate structure represents a later stage. These results also suggest that cleavage of precursor protein VI occurs during, rather than after, the DNA encapsidation process. Overall, our results provide insights into the mechanism of Ad assembly, and allow the first structural comparison between human and nonhuman Ads at backbone level.
journal_name
Virologyjournal_title
Virologyauthors
Cheng L,Huang X,Li X,Xiong W,Sun W,Yang C,Zhang K,Wang Y,Liu H,Huang X,Ji G,Sun F,Zheng C,Zhu Pdoi
10.1016/j.virol.2013.12.012subject
Has Abstractpub_date
2014-02-01 00:00:00pages
174-81eissn
0042-6822issn
1096-0341pii
S0042-6822(13)00675-2journal_volume
450-451pub_type
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