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TitleStructures of the procapsid and mature virion of enterovirus 71 strain 1095.
Journal, issue, pagesJ Virol, Vol. 87, Issue 13, Page 7637-7645, Year 2013
Publish dateMay 1, 2013
AuthorsJavier O Cifuente / Hyunwook Lee / Joshua D Yoder / Kristin L Shingler / Michael S Carnegie / Jennifer L Yoder / Robert E Ashley / Alexander M Makhov / James F Conway / Susan Hafenstein /
PubMed AbstractEnterovirus 71 (EV71) is an important emerging human pathogen with a global distribution and presents a disease pattern resembling poliomyelitis with seasonal epidemics that include cases of severe ...Enterovirus 71 (EV71) is an important emerging human pathogen with a global distribution and presents a disease pattern resembling poliomyelitis with seasonal epidemics that include cases of severe neurological complications, such as acute flaccid paralysis. EV71 is a member of the Picornaviridae family, which consists of icosahedral, nonenveloped, single-stranded RNA viruses. Here we report structures derived from X-ray crystallography and cryoelectron microscopy (cryo-EM) for the 1095 strain of EV71, including a putative precursor in virus assembly, the procapsid, and the mature virus capsid. The cryo-EM map of the procapsid provides new structural information on portions of the capsid proteins VP0 and VP1 that are disordered in the higher-resolution crystal structures. Our structures solved from virus particles in solution are largely in agreement with those from prior X-ray crystallographic studies; however, we observe small but significant structural differences for the 1095 procapsid compared to a structure solved in a previous study (X. Wang, W. Peng, J. Ren, Z. Hu, J. Xu, Z. Lou, X. Li, W. Yin, X. Shen, C. Porta, T. S. Walter, G. Evans, D. Axford, R. Owen, D. J. Rowlands, J. Wang, D. I. Stuart, E. E. Fry, and Z. Rao, Nat. Struct. Mol. Biol. 19:424-429, 2012) for a different strain of EV71. For both EV71 strains, the procapsid is significantly larger in diameter than the mature capsid, unlike in any other picornavirus. Nonetheless, our results demonstrate that picornavirus capsid expansion is possible without RNA encapsidation and that picornavirus assembly may involve an inward radial collapse of the procapsid to yield the native virion.
External linksJ Virol / PubMed:23637404 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution3.9 - 9.76 Å
Structure data

EMDB-5557:
Structure of the EV71 strain 1095 procapsid
Method: EM (single particle) / Resolution: 8.78 Å

EMDB-5558:
Structure of the EV71 strain 1095 mature virion
Method: EM (single particle) / Resolution: 9.76 Å

PDB-4gmp:
Crystal structure of enterovirus 71 strain 1095 procapsid
Method: X-RAY DIFFRACTION / Resolution: 3.9 Å

Source
  • human enterovirus 71
KeywordsVIRUS / Capsid Protein

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