3N44 image
Entry Detail
PDB ID:
3N44
Keywords:
Title:
Crystal structure of the mature envelope glycoprotein complex (trypsin cleavage; Osmium soak) of Chikungunya virus.
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2010-05-21
Release Date:
2010-12-01
Method Details:
Experimental Method:
Resolution:
2.35 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:E3 envelope glycoprotein
Chain IDs:A
Chain Length:65
Number of Molecules:1
Biological Source:Chikungunya virus
Polymer Type:polypeptide(L)
Description:E2 envelope glycoprotein
Chain IDs:B
Chain Length:360
Number of Molecules:1
Biological Source:Chikungunya virus
Polymer Type:polypeptide(L)
Description:E1 envelope glycoprotein
Mutations:P1046A
Chain IDs:C (auth: F)
Chain Length:473
Number of Molecules:1
Biological Source:Chikungunya virus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN C ASN GLYCOSYLATION SITE
Primary Citation

Abstact

Chikungunya virus (CHIKV) is an emerging mosquito-borne alphavirus that has caused widespread outbreaks of debilitating human disease in the past five years. CHIKV invasion of susceptible cells is mediated by two viral glycoproteins, E1 and E2, which carry the main antigenic determinants and form an icosahedral shell at the virion surface. Glycoprotein E2, derived from furin cleavage of the p62 precursor into E3 and E2, is responsible for receptor binding, and E1 for membrane fusion. In the context of a concerted multidisciplinary effort to understand the biology of CHIKV, here we report the crystal structures of the precursor p62-E1 heterodimer and of the mature E3-E2-E1 glycoprotein complexes. The resulting atomic models allow the synthesis of a wealth of genetic, biochemical, immunological and electron microscopy data accumulated over the years on alphaviruses in general. This combination yields a detailed picture of the functional architecture of the 25 MDa alphavirus surface glycoprotein shell. Together with the accompanying report on the structure of the Sindbis virus E2-E1 heterodimer at acidic pH (ref. 3), this work also provides new insight into the acid-triggered conformational change on the virus particle and its inbuilt inhibition mechanism in the immature complex.

Legend

Protein

Chemical

Disease

Primary Citation of related structures