5VU2

Electron cryo-microscopy of "immature" Chikungunya VLP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural studies of Chikungunya virus maturation.

Yap, M.L.Klose, T.Urakami, A.Hasan, S.S.Akahata, W.Rossmann, M.G.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: 13703-13707

  • DOI: 10.1073/pnas.1713166114

  • PubMed Abstract: 
  • Cleavage of the alphavirus precursor glycoprotein p62 into the E2 and E3 glycoproteins before assembly with the nucleocapsid is the key to producing fusion-competent mature spikes on alphaviruses. Here we present a cryo-EM, 6.8-Å resolution structure ...

    Cleavage of the alphavirus precursor glycoprotein p62 into the E2 and E3 glycoproteins before assembly with the nucleocapsid is the key to producing fusion-competent mature spikes on alphaviruses. Here we present a cryo-EM, 6.8-Å resolution structure of an "immature" Chikungunya virus in which the cleavage site has been mutated to inhibit proteolysis. The spikes in the immature virus have a larger radius and are less compact than in the mature virus. Furthermore, domains B on the E2 glycoproteins have less freedom of movement in the immature virus, keeping the fusion loops protected under domain B. In addition, the nucleocapsid of the immature virus is more compact than in the mature virus, protecting a conserved ribosome-binding site in the capsid protein from exposure. These differences suggest that the posttranslational processing of the spikes and nucleocapsid is necessary to produce infectious virus.


    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, IN 47907.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E1 envelope glycoprotein
M, A, B, N, C, O, D, P
866Chikungunya virusMutation(s): 0 
EC: 3.4.21.90
Find proteins for A0A0H4CWF2 (Chikungunya virus)
Go to UniProtKB:  A0A0H4CWF2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
E3 envelope glycoprotein
U, V, W, X
60Chikungunya virus (strain 37997)Mutation(s): 0 
Find proteins for Q5XXP3 (Chikungunya virus (strain 37997))
Go to UniProtKB:  Q5XXP3
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
capsid protein
I, J, K, L
149Chikungunya virus (strain 37997)Mutation(s): 0 
Find proteins for Q5XXP3 (Chikungunya virus (strain 37997))
Go to UniProtKB:  Q5XXP3
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
E1 envelope glycoprotein
E, F, G, H
46Chikungunya virus (strain 37997)Mutation(s): 0 
Find proteins for Q5XXP3 (Chikungunya virus (strain 37997))
Go to UniProtKB:  Q5XXP3
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
E2 envelope glycoprotein
Q, R, S, T
81Chikungunya virus (strain 37997)Mutation(s): 0 
Find proteins for Q5XXP3 (Chikungunya virus (strain 37997))
Go to UniProtKB:  Q5XXP3
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI095366

Revision History 

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2017-12-20
    Type: Database references
  • Version 1.2: 2018-01-03
    Type: Database references