7Z51 image
Entry Detail
PDB ID:
7Z51
EMDB ID:
Keywords:
Title:
Tick-borne encephalitis virus Kuutsalo-14
Biological Source:
PDB Version:
Deposition Date:
2022-03-07
Release Date:
2022-04-20
Method Details:
Experimental Method:
Resolution:
3.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Envelope protein E
Chain IDs:A, B, C
Chain Length:496
Number of Molecules:3
Biological Source:Tick-borne encephalitis virus (WESTERN SUBTYPE)
Polymer Type:polypeptide(L)
Description:Small envelope protein M
Chain IDs:D, E, F
Chain Length:75
Number of Molecules:3
Biological Source:Tick-borne encephalitis virus (WESTERN SUBTYPE)
Ligand Molecules
Primary Citation
Molecular Organisation of Tick-Borne Encephalitis Virus.
Viruses 14 ? ? (2022)
PMID: 35458522 DOI: 10.3390/v14040792

Abstact

Tick-borne encephalitis virus (TBEV) is a pathogenic, enveloped, positive-stranded RNA virus in the family Flaviviridae. Structural studies of flavivirus virions have primarily focused on mosquito-borne species, with only one cryo-electron microscopy (cryo-EM) structure of a tick-borne species published. Here, we present a 3.3 Å cryo-EM structure of the TBEV virion of the Kuutsalo-14 isolate, confirming the overall organisation of the virus. We observe conformational switching of the peripheral and transmembrane helices of M protein, which can explain the quasi-equivalent packing of the viral proteins and highlights their importance in stabilising membrane protein arrangement in the virion. The residues responsible for M protein interactions are highly conserved in TBEV but not in the structurally studied Hypr strain, nor in mosquito-borne flaviviruses. These interactions may compensate for the lower number of hydrogen bonds between E proteins in TBEV compared to the mosquito-borne flaviviruses. The structure reveals two lipids bound in the E protein which are important for virus assembly. The lipid pockets are comparable to those recently described in mosquito-borne Zika, Spondweni, Dengue, and Usutu viruses. Our results thus advance the understanding of tick-borne flavivirus architecture and virion-stabilising interactions.

Legend

Protein

Chemical

Disease

Primary Citation of related structures