Structural dissection of Ebola virus and its assembly determinants using cryo-electron tomography
Bharat, T. A. M., Noda, T., Riches, J. D., Kraehling, V., Kolesnikova, L., Becker, S., Kawaoka, Y., & Briggs, J. A. G. (2012) Structural dissection of Ebola virus and its assembly determinants using cryo-electron tomography. Proceedings of the National Academy of Sciences, 109(11), pp. 4275-4280.
Ebola virus is a highly pathogenic filovirus causing severe hemorrhagic fever with high mortality rates. It assembles heterogenous, filamentous, enveloped virus particles containing a negative-sense, single-stranded RNA genome packaged within a helical nucleocapsid (NC). We have used cryo-electron microscopy and tomography to visualize Ebola virus particles, as well as Ebola virus-like particles, in three dimensions in a near-native state. The NC within the virion forms a left-handed helix with an inner nucleoprotein layer decorated with protruding arms composed of VP24 and VP35. A comparison with the closely related Marburg virus shows that the N-terminal region of nucleoprotein defines the inner diameter of the Ebola virus NC, whereas the RNA genome defines its length. Binding of the nucleoprotein to RNA can assemble a loosely coiled NC-like structure; the loose coil can be condensed by binding of the viral matrix protein VP40 to the C terminus of the nucleoprotein, and rigidified by binding of VP24 and VP35 to alternate copies of the nucleoprotein. Four proteins (NP, VP24, VP35, and VP40) are necessary and sufficient to mediate assembly of an NC with structure, symmetry, variability, and flexibility indistinguishable from that in Ebola virus particles released from infected cells. Together these data provide a structural and architectural description of Ebola virus and define the roles of viral proteins in its structure and assembly
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|Item Type:||Journal Article|
|Keywords:||cryo electron microscopy, nucleocapsid, ebola virus, marburg virus|
|ISSN:||0027-8424 (online) 1091-6490 (print)|
|Subjects:||Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100) > Structural Biology (incl. Macromolecular Modelling) (060112)
Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > MICROBIOLOGY (060500) > Virology (060506)
|Divisions:||Current > Institutes > Institute for Future Environments|
|Copyright Owner:||Copyright 2012 National Academy of Sciences|
|Copyright Statement:||- author can archive pre-print (ie pre-refereeing)
- author can archive post-print (ie final draft post-refereeing)
|Deposited On:||26 Feb 2013 23:58|
|Last Modified:||01 Mar 2013 06:10|
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